2021

Uchizono N.M., Collins A.L, Marrese-Reading C., Arestie S.M., Ziemer J.K., Wirz R.E., “The Role of Secondary Species Emission in Vacuum Facility Effects for Electrospray Thrusters,” J. Applied Physics 130, 143301 (2021); https://doi.org/10.1063/5.0063476 

Chen G., Chen Z., Wang Z., Obenchain R., Wen D., Li H., Wirz R.E., Gu Z., “Lightning-mimicking cold atmospheric plasma for post-surgical cancer treatment,” Science Advances, Vol 7, Issue 36 (2021); https://www.science.org/doi/10.1126/sciadv.abg5686

Thuppul A., Collins A.L., Wright P.L., Uchizono N.M., Wirz R.E., “Mass Flux and Current Distributions of Electrospray Plumes,” J. Applied Physics 130, 103301 (2021); https://doi.org/10.1063/5.0056761

Ottaviano A., Thuppul A., Hayes J., Dodson C., Li G., Chen Z., and Wirz, R.E., “In-situ Microscopy of Ion-Inducted Sputter Erosion of a Featured Surface,” Review of Scientific Instruments, 92, 073701 (2021); https://doi.org/10.1063/5.0043002

Li G., Wirz R.E., “Persistent Sputtering Yield Reduction in Plasma-Infused Foams,” Physical Review Letters, 126 (3), 035001 (2021) https://doi.org/10.1103/PhysRevLett.126.035001

Chen Z., Obenchain R., Wirz R.E., “Tiny cold atmospheric plasma jet for biomedical applications,” Featured Article Processes, 9(2), 249 (2021); https://doi.org/10.3390/pr9020249

Wright P.L., Wirz R.E., “Multiplexed Electrospray Emission on a Porous Wedge,” Physics of Fluids 33, 012003 (2021); https://doi.org/10.1063/5.0030031  

Samples S.A., Wirz R.E., “Parametric Analysis of High Delta-V CubeSat Missions with a Miniature Ion Thruster,” Journal of Spacecraft and Rockets, Vol. 58, No. 3, 2021; https://doi.org/10.2514/1.A34827

2020

Chen Z., Garcia G., Arumugaswami V., Wirz R.E., “Cold atmospheric plasma for SARS-CoV-2 inactivation,” Featured Article Physics of Fluids 32, 111702 (2020); https://doi.org/10.1063/5.0031332

Peter L. Wright , Stephen A. Samples , Nolan M. Uchizono , and Richard E. Wirz, “Comment on “Jet propulsion by microwave air plasma in the atmosphere” [AIP Adv. 10, 055002 (2020)]”, AIP Advances 10, 099101 (2020); https://doi.org/10.1063/5.0013575

Angelopoulos,…, R.E. Wirz, et al., “The ELFIN Mission,” Space Science Reviews (2020) 216:103 https://doi.org/10.1007/s11214-020-00721-7

Uchizono N.M., Collins A.L., Thuppul A., Wright P.L., Eckhardt D.Q., Ziemer J.K., Wirz R.E., “Emission modes in electrospray thrusters operating with high conductivity ionic liquids,” Aerospace, Special Issue: Electric Propulsion, 2020, 7(10), 141; https://doi.org/10.3390/aerospace7100141

Magnusson J.M., Collins A.L., Wirz R.E., “Polyatomic Ion-Induced Electron Emission (IIEE) in Electrospray Thrusters”, Aerospace, Special Issue: Electric Propulsion, 2020, 7(11), 153, https://doi.org/10.3390/aerospace7110153

Thuppul, A.; Wright, P.L.; Collins, A.L.; Ziemer, J.K.; Wirz, R.E., “Lifetime Considerations for Electrospray Thrusters,” Aerospace, Special Issue: Electric Propulsion, 2020, 7(8), 108; https://doi.org/10.3390/aerospace7080108

Barde A., Nithyanandam K., Shinn M., Wirz R.E., “Sulfur heat transfer behavior for uniform and non-uniform thermal charging of horizontally-oriented isochoric thermal energy storage systems,” Intl. J. Heat Mass Transfer, 153 (2020) 119556; https://doi.org/10.1016/j.ijheatmasstransfer.2020.119556

Uchizono N.M., Samples S.A., Wirz R.E., “Tunable reflectionless absorption of electromagnetic waves in a plasma–metamaterial composite structure,” Plasma Sources Sci. Technol. 29 (2020) 085009 (5pp) https://doi.org/10.1088/1361-6595/aba489

Samples S.A., Wirz R.E., “Development of the MiXI Thruster with the ARCH Discharge,” Plasma Res. Express, 2 (2020) 025008; https://doi.org/10.1088/2516-1067/ab906d

Jin K., Wirz R.E., “Sulfur Heat Transfer Behavior in a Vertically-Oriented and Nonuniformly‑Heated Isochoric Thermal Energy Storage System,” Applied Energy, Vol. 260, (2020) 114287; https://doi.org/10.1016/j.apenergy.2019.114287

Chen G., Chen Z., Wen D., Wang Z., Li H., Zeng Y., Dotti G., Wirz R.E., Gu Z., “Transdermal cold atmospheric plasma-mediated immune checkpoint blockade therapy,” Proceedings of the National Academy of Sciences (PNAS), February 18, 2020 117 (7) 3687-3692; https://doi.org/10.1073/pnas.1917891117

Wang Y., Barde A., Jin K., Wirz R.E., “System performance analyses of sulfur-based thermal energy storage,” Energy, 195 (2020) 116996; https://doi.org/10.1016/j.energy.2020.116996

2019

Huerta C.E., Wirz R.E., “Ion-induced electron emission reduction via complex surface trapping,” AIP Advances, Vol. 9, Issue 12, (Editor’s Pick, Featured on Cover) (2019)  https://doi.org/10.1063/1.5120519 

Chiu P.K., Roth-Johnson P.M., Wirz R.E., “Optimal structural design of biplane wind turbine blades,” Renewable Energy, Vol. 147 (2019) https://doi.org/10.1016/j.renene.2019.08.143 

Dodson C.A., Jorns B.A., Wirz R.E., “Measurements of ion velocity and wave propagation in a hollow cathode plume,” Plasma Source Science and Technology, 28 065009 (2019) https://iopscience.iop.org/article/10.1088/1361-6595/ab1c48

Jin K., Barde A., Nithyanandam K., Wirz R.E., “Sulfur heat transfer behavior in vertically-oriented isochoric thermal energy storage systems,” Applied Energy, Vol. 240, (2019) https://doi.org/10.1016/j.apenergy.2019.02.077 (featured in Advances in Engineering, https://advanceseng.com/sulfurtes-next-generation-thermal-energy-storage/)

2018

Dankongkakul B., Wirz R.E., “Axial Ring-Cusp Hybrid (ARCH) Plasma Discharge Design: An Approach to Highly Efficient Miniature-Scale Ion Sources,” Plasma Sources Science and Technology, (2018) https://iopscience.iop.org/article/10.1088/1361-6595/aae63c

Patino M.I., Wirz R.E., Raitses Y., Koel B.E., “Angular, Temperature, and Impurity Effects on Secondary Electron Emission from Ni(110),” Journal of Applied Physics (Editor’s Pick) (2018) https://doi.org/10.1063/1.5025344  

Nithyanandam K., Barde A., Wirz R.E., “Heat Transfer Behavior of Elemental Sulfur for Low Temperature Thermal Energy Storage Applications,” Intl. J. Heat Mass Transfer, HMT_2018_1658 (2018) https://doi.org/10.1016/j.ijheatmasstransfer.2018.07.089

Patino M.I., Wirz R.E., “Electron Emission from Carbon Velvet due to Incident Xenon Ions,” Applied Physics Letters (Editor’s Pick) 113, 041693 (2018) https://doi.org/10.1063/1.5037200

Dodson C.A., Perez-Grande D., Jorns B.A., Goebel D.M., Wirz R.E., “Ion Heating Measurements on the Centerline of a High-Current Hollow Cathode Plume,” Journal of Propulsion and Power (2018) https://doi.org/10.2514/1.B36788

Patino M.I., Wirz R.E., “Characterization of Xenon Ion and Neutral Interactions in a Well-Characterized Experiment” Physics of Plasma, 25, 062108 (2018) https://doi.org/10.1063/1.5030464

Barde A., Jin K., Shinn M., Nithyanandam K., Wirz R.E., “Demonstration of a low cost, high temperature elemental sulfur thermal battery,” Applied Thermal Engineering 137, pp. 259-267 (June 2018) https://doi.org/10.1016/j.applthermaleng.2018.02.094   

Lakeh R.B., Wirz R.E., Kavehpour P., Lavine A.S., “A Dimensionless Model for Transient Turbulent Natural Convection in Isochoric Vertical Thermal Energy Storage Tubes” J. Thermal Sci. Eng. Appl. 10(3), 034501 (June 2018) https://doi.org/10.1115/1.4038587 

Huerta C.E., Patino M.I., Wirz R.E., “Secondary electron emission from textured surfaces”, Journal of Physics D: Applied Physics 51(14), 145202 (March 2018) https://doi.org/10.1088/1361-6463/aab1ac

Nithyanandam K., Barde A., Lakeh R.B., Wirz R.E., “Charge and discharge behavior of elemental sulfur in isochoric high temperature thermal energy storage systems,” Applied Energy 214, pp. 166-177 (March 2018) https://doi.org/10.1016/j.apenergy.2017.12.121

Shinn M., Nithyanandam K., Barde A., Wirz R.E., “Sulfur-based thermal energy storage system using intermodal containment: Design and performance analysis,” Applied Thermal Engineering 128, pp. 1009-1021 (Jan. 2018) https://doi.org/10.1016/j.applthermaleng.2017.08.167

2017

Dankongkakul B., Wirz R.E., “Miniature ion thruster ring-cusp discharge performance and behavior,” Journal of Applied Physics 122, 023208 (2017) https://doi.org/10.1063/1.4995638 

Conversano R.W., Goebel D.M., Hofer R.R., Mikellides I.G., and Wirz R.E., “Performance Analysis of a Low-Power Magnetically Shielded Hall Thruster: Experiments”, Journal of Propulsion and Power 33(4), pp. 975-983 (Aug. 2017) https://doi.org/10.2514/1.B36230

Conversano R.W., Goebel D. M., Mikellides I.G., Hofer R.R., and Wirz R.E., “Performance Analysis of a Low-Power Magnetically Shielded Hall Thruster: Computational Modeling”, Journal of Propulsion and Power 33(4), pp. 992-1001 (Aug. 2017), https://doi.org/10.2514/1.B36231

Jorns B.A., Dodson C., Goebel D.M., Wirz R.E., “Propagation of ion acoustic wave energy in the plume of a high-current LaB6 hollow cathode,” Physical Review E 96, 023208 (Aug. 2017) https://doi.org/10.1103/PhysRevE.96.023208  

Li G.Z., Matlock T.S., Goebel D.M., Dodson C.A., Matthes C.S., Ghoniem N.M., Wirz R.E., “In situ plasma sputtering and angular distribution measurements for structured molybdenum surfaces,” Plasma Sources Sci. Technol. 26, 065002 (11pp.) (April 2017) https://doi.org/10.1088/1361-6595/aa6a7d

Matthes C.S., Ghoniem N.M., Li G.Z., Matlock T.S., Goebel D.M., Dodson C.A., Wirz R.E., “Fluence-Dependent Sputtering Yield of Micro-architectured Materials,” Applied Surface Science 407, pp. 223-235 (June 2017) https://doi.org/10.1016/j.apsusc.2017.02.140

Rivera D., Wirz R.E., Ghoniem N.M., “Experimental measurements of surface damage and residual stresses in micro-engineered plasma facing materials,” Journal of Nuclear Materials 486, pp. 111-121 (April 2017) http://dx.doi.org/10.1016%2Fj.jnucmat.2016.12.035  

2016 and prior

Patino M.I., Raitses Y., Wirz R.E., “Secondary electron emission from plasma-generated nanostructured tungsten fuzz,” Applied Physics Letters 109, 201602 (Nov. 2016) https://doi.org/10.1063/1.4967830

Huerta C.E., Matlock T.S., Wirz R.E., “View factor modeling of sputter-deposition on micron-scale-architectured surfaces exposed to plasma,” J. Appl. Phys. 119, 113303 (March 2016) https://aip.scitation.org/doi/10.1063/1.4944035   

Patino M.I., Raitses Y., Koel B.E., Wirz R.E. “Analysis of Secondary Electron Emission for Conducting Materials Using 4-grid LEED/AES Optics,” J. Phys. D: Appl. Phys. 48 195204 (10pp.) (April 2015) https://doi.org/10.1088/0022-3727/48/19/195204

Lakeh R.B., Lavine A.S., Kavehpour H.P., Wirz R.E., “Study of Turbulent Natural Convection in Vertical Storage Tubes for Supercritical Thermal Energy Storage,” Num. Heat Transfer, Part A, 67(2) pp. 119-139 (Oct 2014) https://doi.org/10.1080/10407782.2014.923224

Tse L.A., Lavine A.S., Lakeh R.B., Wirz R.E., “Exergetic Optimization and Performance Evaluation of Multi-Phase Thermal Energy Storage Systems,” Solar Energy 122, pp. 396–408 (Dec. 2015) https://doi.org/10.1016/j.solener.2015.08.026

Dankongkakul B., Araki S. J., Wirz R.E., “Magnetic field structure influence on primary electron cusp losses for micro-scale discharges,” Physics of Plasmas (featured on cover) 21, 043506 (April 2014) https://doi.org/10.1063/1.4871724

Conversano R., Goebel D.M., Hofer R.R., Matlock T.S., Wirz R.E., “Development and Initial Testing of a Magnetically Shielded Miniature Hall Thruster”, Plasma Science, IEEE Transactions on, 43(1), pp. 103-117 (May 2014) https://doi.org/10.1109/TPS.2014.2321107  

Bran-Anleu G., Lavine A.S., Wirz R.E., Kavehpour H.P., “Algorithm to optimize transient hot-wire thermal property measurement,” Rev. Sci. Instrum. 85, 045105 (April 2014) https://doi.org/10.1063/1.4870275

Matlock T.S., Goebel D.M., Conversano R., Wirz R.E., “A dc plasma source for plasma–material interaction experiments,” Plasma Sources Sci. Technol. 23, 025014 (11pp.) (March 2014) https://doi.org/10.1088/0963-0252/23/2/025014

Araki S.J., Wirz R.E., “Cell-centered particle weighting algorithm for PIC simulations in a non-uniform 2D axisymmetric mesh,” Journal of Computational Physics 272, pp. 218–226 (Sept. 2014) https://doi.org/10.1016/j.jcp.2014.04.037

Roth-Johnson P., and Wirz R.E., “Structural design of spars for 100-m biplane wind turbine blades,” Renewable Energy 71, pp. 133-155 (Nov. 2014)  https://doi.org/10.1016/j.renene.2014.05.030

Tse L.A., Ganapathi G.B., Wirz R.E., Lavine A.S., “Spatial and temporal modeling of sub- and supercritical thermal energy storage,” Solar Energy 103 pp. 402–410 (May 2014) https://doi.org/10.1016/j.solener.2014.02.040

Mao H-S., Wirz R.E., Goebel D.M.,  “Plasma Structure of Miniature Ring-Cusp Ion Thruster Discharges”, Journal of Propulsion and Power 3(3), pp. 628-636 (June 2014) https://doi.org/10.2514/1.B34759

Roth-Johnson P., and Wirz R.E., “Aero-structural investigation of biplane wind turbine blades,” Wind Energy 17(3), pp. 397-411 (March 2014) https://doi.org/10.1002/we.1583

Conversano R.W., Wirz R.E., “Mission Capability Assessment of CubeSats Using a Miniature Ion Thruster,” Journal of Spacecraft and Rockets 50(5), pp. 1035-1046 (April 2013) https://doi.org/10.2514/1.A32435

Araki, S.J., Wirz R.E., “Ion–Neutral Collision Modeling Using Classical Scattering with Spin-Orbit Free Interaction Potential,” Plasma Science, IEEE Transactions on 41(3), pp. 470-480 (Feb.  2013) https://doi.org/10.1109/TPS.2013.2241457

Chu E., Goebel D., Wirz R.E., “Reduction of Energetic Ion Production in Hollow Cathodes by External Gas Injection,” Journal of Propulsion and Power 29(5), pp. 1155-1163 (Oct. 2013) https://doi.org/10.2514/1.B34799

Lakeh R.B., Lavine, A.S., Kavehpour H.P., Ganapathi, G.B., Wirz R.E., “Effect of Laminar and Turbulent Buoyancy-Driven Flows on Thermal Energy Storage using Supercritical Fluids,” Numerical Heat Transfer, Part A 64(12), pp. 955–973, (Sept. 2013) https://doi.org/10.1080/10407782.2013.811349

Tarzi Z., Speyer J., Wirz R.E., “Fuel Optimum Low-Thrust Elliptic Transfer using Numerical Averaging,” Acta Astronautica 86, pp. 95-118 (June 2013) https://doi.org/10.1016/j.actaastro.2013.01.003

Mao H-S., Wirz R.E., “Quasi-equilibrium electron density along a magnetic field line,” Applied Physics Letters 101(22), 224106 (Nov. 2012) https://doi.org/10.1063/1.4768301

Wirz R.E., Anderson J., Katz I., “Time-Dependent Erosion of Ion Optics,” Journal of Propulsion and Power 27(1), pp. 211-217 (Feb. 2011) https://arc.aiaa.org/doi/pdf/10.2514/1.46845

Wirz R.E., Katz I., Goebel D., Anderson J., “Electron Backstreaming Determination for Ion Thrusters,” Journal of Propulsion and Power 27(1), pp. 206-210 (Feb. 2011) https://arc.aiaa.org/doi/pdf/10.2514/1.46844

Wirz R.E., Shariff S., “Ground Effects for Widely Spaced, Supersonic Vertical Retrorockets on CEV,” Journal of Spacecraft and Rockets 46(3), pp. 599-605 (June 2009) https://doi.org/10.2514/1.36299

Wirz R.E., Gamero M., Goebel D., “Pulsed Operation of an Ion Accelerator,” NASA Tech Brief 33(2), NPO-44961, pp. 24 (Feb 2009) https://ntrs.nasa.gov/search.jsp?R=20090008642

Hofer, R.R.; Johnson, L.K.; Goebel, D.M.; Wirz, R.E., “Effects of Internally Mounted Cathodes on Hall Thruster Plume Properties,” Plasma Science, IEEE Transactions on 36(5) pp. 2004-2014 (Oct. 2008) https://doi.org/10.1109/TPS.2008.2000962

Wirz R.E., Anderson J.R., Goebel D.M., Katz I., “Decel Grid Effects on Ion Thruster Grid Erosion,” Plasma Science, IEEE Transactions on 36(5), pp. 2122-2129 (Oct. 2008) https://doi.org/10.1109/TPS.2008.2001041

Wirz R.E., Goebel D.M., “Effects of Magnetic Field Topography on Ion Thruster Discharge Performance,” Plasma Sources Science and Technology 17, 035010, (June 2008) https://doi.org/10.1088/0963-0252/17/3/035010

Wirz R.E., Sullivan R., Przybylowski J., Silva M., “Hollow Cathode and Low-Thrust Extraction Grid Analysis for a Miniature Ion Thruster,” International Journal of Plasma Science and Engineering 2008, pp. 1-11 (June 2008) http://dx.doi.org/10.1155/2008/693825

Goebel D.M., Polk J.E., Sengupta A., Wirz R.E., “Increasing the Life of a Xenon-Ion Spacecraft Thruster,” NASA Tech Brief 31(11), NPO-43495 (Nov. 2007) https://ntrs.nasa.gov/search.jsp?R=20100011234

Goebel D., Wirz R.E., Katz I., “Analytical Ion Thruster Discharge Performance Model,” Journal of Propulsion and Power 23(5), pp. 1055-1067 (Oct. 2007) https://doi.org/10.2514/1.26404

Awarded Patents

  1. Wirz R.E., Barde, A. and Nithyanandam, K., “Thermal Energy Storage System,” Patent No. 10,935,327 B2, Mar. 2, 2021 https://patents.google.com/patent/US10935327B2/en
  2. Wirz R.E., Wells P.A., “Modular Thermal Energy Storage System,” S. Patent No. 10,859,324, Dec 8, 2020 https://patents.google.com/patent/US10859324B2
  3. Lavine G.L., Wirz R.E., Aryafar H., Chen C., Lovegrove K.O., “High Temperature Synthesis for Power Production and Storage,” U.S. Patent No. 10,641,524 B2; May 5, 2020 https://patents.google.com/patent/US10641524B2
  4. Roth-Johnson P., Wirz R.E., “Wind Turbine Blade with Biplane Sections,” US Patent 9,739,259 B2, Aug. 22, 2017 https://patents.google.com/patent/US9739259B2
  5. Wirz R.E., Aspe S., “Integrated Wind Turbine,” Patent No. US 9,228,564 B2, Jan. 05, 2016. https://patents.google.com/patent/US9228564B2
  6. Wirz R.E., “Accelerator System and Method for Accelerating Particles,” Patent No. US 7,773,362 B1, Aug. 10, 2010 https://patents.google.com/patent/US7773362B1
  7. Wirz R.E., “Internal Conductively-Heated Cathode,” Patent No. US 7,471,035 B2, Dec. 30, 2008 https://patents.google.com/patent/US7471035B2

2021

Wirz R.E., “Plasma Interactions with Complex Surfaces,” Bulletin of the American Physical Society, 74th Annual Gaseous Electronics Conference, 2021; https://meetings.aps.org/Meeting/GEC21/Session/SR53.7

Ottaviano A., Wirz R.E., “Secondary Electron Emission from Complex Surfaces,” Bulletin of the American Physical Society, Division of Plasma Physics, 2021; https://meetings.aps.org/Meeting/DPP21/Session/PP11.36

Konopliv M., Thuppul A., Wirz R.E., “Validation of Collisional Radiative Models for Low Temperature Xenon Plasmas,” Bulletin of the American Physical Society, Division of Plasma Physics, 2021; https://meetings.aps.org/Meeting/DPP21/Session/PP11.12

Thuppul A., Konopliv M., Wirz R.E., “Plasma Interactions and Sputtering Erosion for Plasma-Infused Volumetrically-Complex Surfaces,” Bulletin of the American Physical Society, Division of Plasma Physics, 2021; https://meetings.aps.org/Meeting/DPP21/Session/PP11.37

Wright P.L, Wirz R.E., “Transient Flow in Porous Electrospray Emitters,” AIAA Propulsion and Energy Forum, 2021; https://doi.org/10.2514/6.2021-3437

Chaplin V.H., Konopliv M., Simka T., Johnson L.K., Lobbia R.B., Wirz R.E., “Insights from Collisional-Radiative Models of Neutral and Singly-Ionized Xenon in Hall Thrusters,” AIAA Propulsion and Energy Forum, 2021; https://doi.org/10.2514/6.2021-3378

Konopliv M., Johnson L.K., Chaplin V.H., Lobbia R.B., Thuppul A., Simka T., Wirz R.E., “Collisional-Radiative Models of Neutral and Singly-Ionized Xenon in Hall Thrusters: Experimental Validation and Model Investigations,” AIAA Propulsion and Energy Forum, 2021; https://doi.org/10.2514/6.2021-3390

Wright P.L, Wirz R.E., “Fluid Mechanics of Porous Electrospray Thrusters,” SoCal Fluids, 2021

Pichitkul A., Sankar L.N., Wirz R.E., “Analysis of Biplane Blades for Large-Scale Offshore Wind Turbines,” SciTech 2021; https://doi.org/10.2514/6.2021-0814

2020

Chen Z., Wirz R.E., “Microneedle patch-assisted combination of cold atmospheric plasma and immune checkpoint blockade,” 47th IEEE International Conference on Plasma Science (ICOPS-2020) and 2nd ASIA Pacific Conference on Plasma and Terahertz Science (APCOPTS-2020), December 6-10, 2020 (Presentation)

Chen Z., Garcia G., Arumugaswami V., Wirz R.E., “Cold atmospheric plasma for SARS-CoV-2 inactivation,” medRxiv (2020); https://www.medrxiv.org/content/10.1101/2020.09.17.20192872v1

Chen, Z.; Wirz, R.E., Cold Atmospheric Plasma for COVID-19. Preprints 2020, 2020040126; https://www.preprints.org/manuscript/202004.0126/v1

Ziemer J.K., Marrese-Reading C.M., Arestie S.M., Demmons N.R., Wirz R.E., Collins A.L., Gamero-Castaño M., “Progress on Developing LISA Microthruster Technology,” AIAA Propulsion and Energy Forum, AIAA 2020-3609, 2020; https://doi.org/10.2514/6.2020-3609

2019

Wirz R.E., “Improving Electrospray Thruster Impulse and Life,” Joint Army Navy NASA Air Force (JANNAF) Interagency Propulsion Committee Meeting, Tampa FL. (Dec 2019)

Wirz R.E., Samples S.A., “The Miniature Xenon Ion (MiXI) Thruster: Development and Capabilities,” Joint Army Navy NASA Air Force (JANNAF) Interagency Propulsion Committee Meeting, Tampa FL. (Dec 2019)

Wirz R.E., Collins A.L., Chen Z., Huerta C., Li G.Z., Samples S.A., Thuppul A., Wright P.L., Uchizono N.M., Huh H., Davis M.J., Ottaviano A., “Electric Propulsion Activities at the UCLA Plasma & Space Propulsion Laboratory,” IEPC-2019-547, 36th International Electric Propulsion Conference, Vienna, Austria, (Sept. 2019)

Ziemer J.K., Marrese-Reading C.M., Arestie S.M., Conroy D.G., Leifer S.D., Demmons N.R., Gamero-Castaño M., Wirz R.E., “LISA Colloid Microthruster Technology Development Plan and Progress,” IEPC-2019-547, 36th International Electric Propulsion Conference, Vienna, Austria, (Sept. 2019)

Uchizono N.M., Collins A.L., Thuppul A., Wright P.L., Eckhardt D.Q., Ziemer J.K., Wirz R.E., “Electrospray Transient Emission Behavior and Spatial Stability,” IEPC-2019-368, 36th International Electric Propulsion Conference, Vienna, Austria, Sept. 2019

Huh H., Wirz R.E., “Numerical Simulation of Electrospray Extraction for Highly Conductive Propellants,” IEPC-2019-565, 36th International Electric Propulsion Conference, Vienna, Austria, Sept. 2019

Thuppul A., Collins A.L., Wright P.L., Uchizono N.M., Wirz R.E., “Spatially-Resolved Mass Flux and Current Measurements for Electrospray Plumes,” IEPC-2019-571, 36th International Electric Propulsion Conference, Vienna, Austria, Sept. 2019

Collins A.L., Thuppul A., Wright P.L., Uchizono N.M., Huh H., Davis M.J., Ziemer J.K., Demmons N.R., Wirz R.E., “Assessment of grid impingement for electrospray thruster lifetime,” IEPC-2019-213, 36th International Electric Propulsion Conference, Vienna, Austria, Sept. 2019

Davis M.J., Collins A.L., Wirz R.E., “Electrospray Plume Evolution Via Discrete Simulations,” IEPC-2019-590, 36th International Electric Propulsion Conference, Vienna, Austria, Sept. 2019

Wright P.L., Huh H., Uchizono N.M., Thuppul A., Wirz R.E., “A Novel Variable-Mode Emitter for Electrospray Thrusters,” IEPC-2019-650, 36th International Electric Propulsion Conference, Vienna, Austria, Sept. 2019

Samples S.A., Wirz R.E., “Development Status of the Miniature Xenon Ion Thruster,” IEPC-2019-143, 36th International Electric Propulsion Conference, Vienna, Austria, (Sept. 2019)

Ottaviano A., Li G.Z., Huerta C., Thuppul A., Chen Z., Dodson C.A., Wirz R.E., “Plasma Material Interactions for Electric Propulsion: Challenges, Approaches, and Future,” IEPC-2019-157, 36th International Electric Propulsion Conference, Vienna, Austria, (Sept. 2019)

Wirz R. E., Collins A. C., Thuppul A., Wright P. L., Uchizono N. M., Huh H., Davis M. J., “Electrospray Thruster Performance and Lifetime Investigation for the LISA Mission,” AIAA-2019-3816, AIAA Propulsion and Energy Forum, Indianapolis, IN, USA, (Aug. 2019) https://doi.org/10.2514/6.2019-3816

Ziemer J.K., Marrese-Reading C.M., Arestie S.M., Conroy D.G., Leifer S.D., Ortega A.L., Demmons N.R., Gamero-Castaño M., Wirz R.E., “Incorporating Lessons Learned into LISA Colloid Microthruster Technology Development,” AIAA-2019-3816, AIAA Propulsion and Energy Forum, Indianapolis, IN, USA, (Aug. 2019) https://arc.aiaa.org/doi/10.2514/6.2019-3814

2018

Shumlak, B. Açikmeşe, E. L. Claveau, E. G. Forbes, R. P. Golingo, B. A. Nelson, Y. Raitses, R. E. Wirz, Y. Zhang, “Fusion space propulsion system based on the sheared flow stabilization Z-pinch”, 60th Annual Meeting of APS-DPP (Presentation) (2018)

Wright P.L., Thuppul A., Wirz R.E., “Life-Limiting Emission Modes for Electrospray Thrusters,” AIAA-2018-4726, 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH (July 2018) https://arc.aiaa.org/doi/abs/10.2514/6.2018-4726

Thuppul A., Wright P.L., Wirz R.E., “Lifetime Considerations and Estimation for Electrospray Thrusters,” AIAA-2018-4652, 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH (July 2018) https://arc.aiaa.org/doi/abs/10.2514/6.2018-4652

Huerta C.E., Wirz R.E., “DC-ION model validation and convergence studies,” AIAA-2018-4813, 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH (July 2018) https://arc.aiaa.org/doi/abs/10.2514/6.2018-4813

Li G., Huerta C.E., Wirz R.E., “Computational Modeling of an Axial Ring Cusp Hybrid Discharge for the MiXI thruster,” AIAA-2018-4814, 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH (July 2018) https://arc.aiaa.org/doi/abs/10.2514/6.2018-4814

Samples S.A., Li G., Wirz R.E., “Performance Testing and Development of the MiXI Thruster with the ARCH Discharge,” AIAA-2018-4648, 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH (July 2018) https://arc.aiaa.org/doi/abs/10.2514/6.2018-4648

2017

Russell, C.T., Wirz, R.E., Lai, H.R., Li, J.Y., Connors, M., “Smallsats with Ion Propulsion: An Affordable Approach to Meeting the Needs of Planetary Defense and Planetary Science at 1AU,” No. 1964, id.1270, 48th Lunar and Planetary Science Conference, The Woodlands, Texas (March 2017) 2017LPI….48.1270R

2016 and prior

Shinn M., Nithyanandam K., Barde A., Wirz R.E., “Thermal Analysis of Elemental Sulfur in a Shell-and-Tube Configuration for Thermal Energy Storage Applications,” IMECE2016-67389, ASME 2016 International Mechanical Engineering Congress and Exposition, Phoenix, Arizona (Nov. 2016), http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/90990/v06bt08a063-imece2016-67389.pdf

Patino M., Yevgeny R., Wirz R.E., “Electron Emission from Nano and Microstructured Materials for Fusion and Plasma Discharge Applications,” APS Division of Plasma Physics Meeting , Poster, (Oct 2016) http://adsabs.harvard.edu/abs/2016APS..DPPUO4013P

Dankongkakul B., Wirz R.E., “Design of Miniature Ring-Cusp Ion Thrusters via Analysis of Discharge EEDF and Plasma Parameter Mapping,” AIAA-2016-4545, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT (July 2016) https://doi.org/10.2514/6.2016-4545

Huerta C.E., Wirz R.E., “Surface Geometry Effects on Secondary Electron Emission Via Monte Carlo Modeling,” AIAA-2016-4840, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT (July 2016) https://doi.org/10.2514/6.2016-4840

Dodson C.A., Perez-Grande D., Jorns B., Goebel D.M., Wirz R.E., “Laser-induced Fluorescence Measurements of Energetic Ions in a 100-A LaB6 Hollow Cathode Plume,” AIAA-2016-4838, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT (July 2016) https://doi.org/10.2514/6.2016-4838 

Li G.Z., Dodson C.A., Wirz R.E, Matlock T.S., Goebel D.M, “Implementation of in situ diagnostics for sputter yield measurements in a focused plasma,” AIAA-2016-4841, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT (July 2016) https://doi.org/10.2514/6.2016-4841 

Marrese-Reading C.M, Anderson J., Jung-Kubiak C., Greer F., Rouhi N., Wilson D., White V., Dickie M., Mueller R., Singh V., Mackie W., Wirz R.E., Gamero-Castano M., “Silicon Emitter Needle and Array Design for Indium Electrospray Arrays for Spacecraft Propulsion,” AIAA-2016-4547, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT (July 2016) https://doi.org/10.2514/6.2016-4547 

Marrese-Reading C.M., Anderson J., Jung-Kubiak C., Polk J., Singh V., Yee K., White V., Wilson D., Bruneau P., Rouhi N., Greer F., Borgonia J.P., Dickie M., Muller R., Ziemer J., Gray A., Mueller J., Wirz R.E., Gamero-Castano M., “Microfluidic Electrospray Propulsion (MEP) Thruster Performance with Microfabricated Emitter Arrays for Indium Propellant,” AIAA-2016-4738, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT (July 2016) https://doi.org/10.2514/6.2016-4738 

Zhao J., Luo W., Guo J., Matlock T., Wirz R., Randall C. A., Lanagan M. T., “Microwave Generated Plasmas in Ring Resonators,” Microwave Materials and Applications, MMA2016.org, Seoul Korea, Presentation (July 5, 2016)

Wells, P., Nithyanandam, K., Wirz, R.E., “Cost Optimal Strategies of High Temperature Thermal Energy Storage Systems in Combined Heat and Power Applications,” ASME 2016 10th International Conference on Energy Sustainability, ASME ES2016-59471 Charlotte, NC (June 2016) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/90140/v001t03a006-es2016-59471.pdf

Nithyanandam, K., Barde, A., Lakeh, R.B., Tse, L., Wirz, R.E., “Heat Transfer Behavior of Sulfur for Thermal Storage Applications,” ASME 2016 10th International Conference on Energy Sustainability, Charlotte, NC (June 2016) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/90142/v001t05a008-es2016-59470.pdf

Nithyanandam, K., Barde, A., Lakeh, R.B., Wirz, R.E., “Design and Analysis of Low-Cost Thermal Storage System for High Efficiency Concentrating Solar Power Plants,” ASME 2016 10th International Conference on Energy Sustainability, Charlotte, NC (June 2016) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/90142/v001t05a007-es2016-59469.pdf

Barde, A., Shinn, M., Nithyanandam, K., Lakeh, R.B., Wirz, R.E., “Sulfur-Based Thermal Storage System: Thermal Characteristics and Performance Analysis,” ASME 2016 10th International Conference on Energy Sustainability, Charlotte, NC, Presentation (June 2016)

Lakeh R.B., Nithyanandam K., Barde, A., Tse L., Wirz, R.E., “Effect of Viscosity Variations on Charge and Discharge Time of a Sulfur-Based Thermal Energy Storage System,” ASME 2016 10th International Conference on Energy Sustainability, Charlotte, NC (June 2016) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/90142/v001t05a002-es2016-59161.pdf

Chiu P.K., Wirz R.E., “Optimal Aerodynamic Design of a Biplane Wind Turbine Blade,” AIAA 2016-1266, 34th Wind Energy Symposium, San Diego, CA (Jan. 2016) https://doi.org/10.2514/6.2016-1266

Lakeh, R.B., Guerrero, Y.B., Nithyanandam, K., Wirz, R.E., “Assessment of Natural Convection Heat Transfer in an Isochoric Thermal Energy Storage System,” ASME IMECE205-52284, ASME International Mechanical Engineering Congress & Exposition (IMECE), Houston, TX (Nov. 2015) https://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/86890/v06at07a058-imece2015-52284.pdf

Huerta C.E., Matlock T.S., Wirz R.E., “Validation of a Plasma-Facing Surface Sputtering and Deposition View Factor Model,” AIAA SPACE 2015, Pasadena, CA (Sept. 2015) https://doi.org/10.2514/6.2015-4503

Wirz R.E., “Miniature Ion Thrusters: A Review of Modern Technologies and Mission Capabilities,” IEPC-2015-275, 34th International Electric Propulsion Conference and 6th Nano-satellite Symposium, Kobe, Japan (July 2015) http://erps.spacegrant.org/uploads/images/2015Presentations/IEPC-2015-275_ISTS-2015-b-275.pdf

Araki S.J., Wirz R.E., “Modeling of Elastic Collisions between High Energy and Slow Neutral Atoms,” IEPC-2015-202, 34th International Electric Propulsion Conference and 6th Nano-satellite Symposium, Kobe, Japan (July 2015) http://www.dtic.mil/dtic/tr/fulltext/u2/a626028.pdf

Matlock T.S., Dodson C.A., Goebel D.M., Wirz R.E., “Measurements of Transport due to Low Frequency Oscillations in a Rotating Hollow Cathode Plasma,” IEPC-2015-137, 34th International Electric Propulsion Conference and 6th Nano-satellite Symposium, Kobe, Japan (July 2015) http://erps.spacegrant.org/uploads/images/2015Presentations/IEPC-2015-137_ISTS-2015-b-137.pdf

Conversano R.W., Goebel D.M., Hofer R.R., Matlock T.S., Wirz R.E., “Magnetically Shielded Miniature Hall Thruster: Design Improvement and Performance Analysis,” IEPC-2015-100, 34th International Electric Propulsion Conference and 6th Nano-satellite Symposium, Kobe, Japan (July 2015)  http://www.wirz.seas.ucla.edu/sites/default/files/publications/conversano2015magnetically-shielded-miniature-hall-thruster-design-improvement-and-performance.pdf

Lakeh, R.B., Kavehpour, H.P., Wirz, R. E., Lavine, A.S., “Transient Turbulent Natural Convection In Vertical Tubes For Indirect Thermal Energy Storage,” ASME ES2015-49092, ASME 9th International Conference on Energy Sustainability, San Diego, CA (July 2015) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/86275/v002t18a003-es2015-49092.pdf

Tse, L, Wirz, R.E., Lavine, A.S., “Optimal Operation Strategies for Thermal Energy Storage Systems in Solar Thermal Power Plants,” ASME 9th International Conference on Energy Sustainability, San Diego, CA (July 2015) (Best Student Paper) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/86275/v002t18a001-es2015-49053.pdf

Conversano R.W., Goebel D.M., Hofer R.R., Mikellides I.G., Katz I., Wirz R.E.., “Development and Validation Overview for the Design of Low Power Magnetically Shielded Hall Thrusters,” 62nd JANNAF Propulsion Meeting, Nashville, TN (June 2015), Dist C.

Lakeh R.B., Kavehpour H.R., Wirz R.E., Lavine A.S., “Transient turbulent natural convection in vertical tubes for thermal energy storage,” IMECE2014-37773, ASME 2014 International Mechanical Engineering Conference and Exposition, Montreal, Quebec, Canada (Nov. 2014) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/83085/v06bt07a049-imece2014-37773.pdf

Conversano R.W., Arora N., Goebel D.M., Wirz R.E., “Preliminary Mission Capabilities Assessment of a Magnetically Shielded Miniature Hall Thruster,” IAC-14.C4.4.4, 65th International Aerospace Congress, Toronto, Canada (Oct. 2014) http://www.wirz.seas.ucla.edu/sites/default/files/publications/conversano2014preliminary-mission-capabilities-assessment-of-a-magnetically-shielded-miniature-hall_0.pdf

Matlock T., Goebel D., Wirz R.E., “An Investigation of Low Frequency Plasma Instabilities in a Cylindrical Hollow Cathode Discharge,” AIAA 6.2014-3508, 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cleveland, OH (July 2014) https://doi.org/10.2514/6.2014-3508 

Araki S.J., Wirz R.E., “Magnetic Field Aligned Mesh for Ring-Cusp Discharge Chambers,” 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cleveland, OH (July 2014) https://doi.org/10.2514/6.2014-3830

Tse, L.A., Baghaei Lakeh, R., Wirz. R.E., Lavine, A.S., “Exergy-Based Optimization of Sub- and Supercritical Thermal Energy Storage Systems,” ASME ES204-6302, ASME 8th International Conference on Energy Sustainability, Boston, MA (July 2014) https://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/81450/v002t12a001-es2014-6302.pdf

Conversano R.W., Goebel D.M., Mikellides I.G., Hofer R.R., Matlock T.S., Wirz R.E., “Magnetically Shielded Miniature Hall Thruster: Performance Assessment and Status Update,”50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cleveland, OH (July 2014) https://doi.org/10.2514/6.2014-3896

Lakeh, R.B., Lavine, A.S., Kavehpour, H.P., Wirz, R.E, “Investigation of Transient, Turbulent Natural Convection in Vertical Tubes for Thermal Energy Storage in Supercritical CO2,” 66th Annual Meeting of the Fluid Mechanics Division of the American Physical Society, Pittsburgh, PA (Nov. 2013) 2013APS..DFD.M2003B

Lakeh R.B., Kavehpour H.P., Lavine, A.S., Ganapathi G.B., Wirz, R.E., “Study of turbulent natural convection in vertical storage tubes for supercritical thermal storage system,” ASME IMECE2013-62716, ASME International Mechanical Engineering Congress & Exposition (IMECE), San Diego, CA (Nov. 2013) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/79154/v06bt07a030-imece2013-62716.pdf

Bran-Anleu, G., Lavine, A.S., Wirz, R.E., Lakeh R.B., Kavehpour, H.P., “An Algorithm to Determine the Optimized Data Range in Transient Hotwire Thermal Property Measurement,” ASME IMECE2013-64940, ASME International Mechanical Engineering Congress & Exposition (IMECE), San Diego, CA (Nov. 2013) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/79154/v06bt07a030-imece2013-62716.pdf

Furst, B., Lavine, A.S., Lakeh, R.B., Wirz, R.E., “Isobaric, Isochoric and Supercritical Thermal Energy Storage in R134a,” ASME IMECE2013-64947, ASME International Mechanical Engineering Congress & Exposition (IMECE), San Diego, CA (Nov. 2013) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/79154/v06bt07a072-imece2013-64947.pdf

Dodson C.A., Wirz R.E., Matlock T.S., “Computational Modeling of a High Power Plasma Source for Material Interaction Experiments,” IEPC-2013-224, 33rd International Electric Propulsion Conference, Washington, D.C. (Oct. 2013) http://www.wirz.seas.ucla.edu/sites/default/files/publications/dodson2013computational-modeling-of-a-high-power-plasma-source-for-material-interaction-experiments.pdf

Araki S.J., Wirz R.E., “Particle Simulation of Near-Surface Cusp Confinement of Weakly Ionized Plasma,” IEPC-2013-349, 33rd International Electric Propulsion Conference, Washington, D.C. (Oct. 2013) http://wirzresearchgroup.com/sites/default/files/publications/araki2013particle-simulation-of-near-surface-cusp-confinement-of-weakly-ionized-plasma.pdf

Matlock T.S., Goebel D.M., Conversano R., Wirz R.E., “Near anode plasma in the plasma interaction facility at UCLA,” IEPC-2013-327, 33rd International Electric Propulsion Conference, Washington, D.C. (Oct. 2013) http://erps.spacegrant.org/uploads/images/images/iepc_articledownload_1988-2007/2013index/l3ku1eg5.pdf

Dankongkakul B., Wirz R.E., “Electron Loss at a Magnetic Cusp for a Range of

Upstream Magnetic Field Conditions,” IEPC-2013-331, 33rd International Electric Propulsion Conference, Washington, D.C. (Oct. 2013) http://www.iepc2013.org/get?id=331

Patino M.I., Raitses Y., Koel B.E., Wirz R.E., “Application of Auger Spectroscopy for Measurement of Secondary Electron Emission from Conducting Material for Electric Propulsion Devices,” IEPC-2013-320, 33rd International Electric Propulsion Conference, Washington, D.C. (Oct. 2013) http://www.wirz.seas.ucla.edu/~wirzrese/sites/default/files/publications/patino2013application-of-auger-spectroscopy-for-measurement-of-secondary-electron-emission-from.pdf

Conversano R., Goebel D.M., Hofer R.R., Matlock T.S., Wirz R.E., “Magnetically Shielded Miniature Hall Thruster: Development and Initial Testing,” IEPC-2013-201, 33rd International Electric Propulsion Conference, Washington, D.C. (Oct. 2013) http://erps.spacegrant.org/uploads/images/images/iepc_articledownload_1988-2007/2013index/h8gqm62v.pdf

Dankongkakul B., Araki S. J., Wirz R.E., “Influence of Upstream Field Structure on Primary Electron Loss for a Permanent Magnet Cusp,” AIAA-2013-3963, 49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, San Jose, CA (July 2013) https://doi.org/10.2514/6.2013-3963 

Matlock T.S., Goebel D.M., Conversano R.W., Wirz R.E., “The Plasma Interactions Facility at UCLA,” AIAA-2013-4132, 49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, San Jose, CA (July 2013) https://doi.org/10.2514/6.2013-4132 

Lakeh R.B., Lavine, A., Kavehpour H.P., Ganapathi G.B., Wirz, R.E, “Effect of natural convection on thermal energy storage in supercritical fluids,” ASME ES2013-18079, ASME 7th International Conference on Energy Sustainability, Minneapolis, MN (July 2013) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/77295/v001t05a001-es2013-18079.pdf

Tse L., Stopin A., Ganapathi, G. B., Garcia-Garibay M.A., Wirz, R.E., “Thermal testing of organic fluids for supercritical thermal energy storage systems,” ASME ES2013-18195, ASME 7th International Conference on Energy Sustainability, Minneapolis, MN (July 2013) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/77293/v001t03a007-es2013-18195.pdf

Ganapathi G. B, Berisford D., Furst B., Bame D., Pauken M., Wirz R.E., “A 5 kWht lab-scale demonstration of a novel thermal energy storage concept with supercritical fluids,” ASME ES2013-18182, ASME 7th International Conference on Energy Sustainability, Minneapolis, MN (July 2013) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/77305/v001t15a005-es2013-18182.pdf

Wirz R.E., “Near-Surface Cusp Confinement of Micro-Scale Plasma,” 2012 AFOSR Space Propulsion and Power Program Review, Arlington, VA (Sept. 2012) http://www.dtic.mil/get-tr-doc/pdf?AD=ADA568238

Wirz R.E., Araki S. J., Dankongkakul B., “Near-Surface Cusp Confinement for Weakly Ionized Plasma,” AIAA-2012-3948, 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Atlanta, GA (Aug. 2012) https://doi.org/10.2514/6.2012-3948 

Patino M., Chu L., Wirz R.E., “Ion-Neutral Collision Analysis for a Well-Characterized Plasma Experiment,” AIAA-2012-4119, 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Atlanta, GA (Aug. 2012) https://doi.org/10.2514/6.2012-4119 

Mao H.-S., Goebel D., Wirz R.E., “Plasma Structure of Miniature Ring-Cusp Ion Thruster Discharges,” AIAA-2012-4021, 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Atlanta, GA (Aug. 2012) https://doi.org/10.2514/6.2012-4021

Ganapathi G.B., Wirz R.E., “High density Thermal Energy Storage with Supercritical Fluids,” ASME ESl2012-91008, ASME 6th International Conference on Energy Sustainability, San Diego, CA (July 2012) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/75584/699_1.pdf

Stopin A., Ganapathi G. B., Wirz R.E., Garcia-Garibay M., “Stability of organic fluids at high temperature for thermal energy storage,” ASME 6th International Conference on Energy Sustainability, San Diego, California (July 2012) (Poster)

Tse, L., Ganapathi, G.B., Wirz R.E., Lavine, A., “System Modeling for a Supercritical Thermal Energy Storage System,” ASME ES2012-91011  ASME 6th International Conference on Energy Sustainability, San Diego, California (July 2012) http://proceedings.asmedigitalcollection.asme.org/data/conferences/asmep/75584/691_1.pdf

Choi, D., Wirz R.E., Ganapathi, G. B., Kavehpour, H. P., “Numerical Simulation of Heat Transfer to a Supercritical Thermal Fluid,” ASME 6th International Conference on Energy Sustainability, San Diego, California (July 2012) (Presentation)

Stopin A., Ganapathi G., Wirz R.E., Garcia-Garibay M., “Stability of organic fluids at high temperature for thermal energy storage,” 16th Green Chemistry & Engineering Conference, Washington D.C. (June 2012) (Presentation)

Johnson P., Wirz R.E., “Structural design of spars for 100-meter biplane wind turbine blades,” AWEA Windpower Conference, Atlanta, GA (June 2012) (Presentation)

Chiu P., Johnson P., Wirz R.E., “Aerodynamic Performance of Biplane Airfoils for Wind Turbine Blades,” AWEA Windpower Conference, Atlanta, GA (June 2012) (Presentation)

Mao H.-S., Wirz R.E., “Plasma Map of Miniature Ring-Cusp Ion Thrusters,” UCLA Mechanical and Aerospace Engineering Research and Technology Review, Los Angeles, CA (April 2012) (Poster)

Araki S. J., Wirz R.E., “Collision Modeling of High Velocity Ions in a Quiescent Gas,” UCLA Mechanical and Aerospace Engineering Research and Technology Review, Los Angeles, CA (April 2012) (Poster)

Patino M., Chu L., Wirz R.E., “Simplified Plasma Experiment for Investigation of Plasma Diffusion and Transport Mechanisms,” UCLA Mechanical and Aerospace Engineering Research and Technology Review, Los Angeles, CA (April 2012) (Poster)

Tse, L., Ganapathi, G. B., Wirz R.E., Lavine, A., “Thermal Energy Storage with Supercritical Fluids,” UCLA Mechanical and Aerospace Engineering Research and Technology Review, Los Angeles, CA (April 2012) (Poster)

Wirz R.E., Ganapathi G. B., “Thermal Energy Storage with Supercritical Fluids,” ARPA-E Energy Innovation Summit, Washington D.C. (Feb. 2012) (Poster)

Wirz R.E., Stopin A., “Thermal Energy Storage with Supercritical Fluids, Fluid Screening and Chemical Analysis,” ARPA-E Energy Innovation Summit, Washington D.C. (Feb. 2012) (Poster)

Wirz R.E., Tse L., “Thermal Energy Storage with Supercritical Fluids, System Modeling for Supercritical Thermal Energy Storage and Heat Transfer Behavior of Supercritical Fluids,” ARPA-E Energy Innovation Summit, Washington D.C. (Feb. 2012) (Poster)

Ganapathi G.B., Wirz R.E., “Thermal Energy Storage with Supercritical Fluids (Super TES),” Clean Tech India-USA Business Conference (Oct. 2011) https://trs.jpl.nasa.gov/bitstream/handle/2014/43596/11-4863_A1b.pdf?sequence=1

Wirz R.E., Chu L., Patino M., Mao H., Araki S.J., “Well-Characterized Plasma Experiments for Validation of Computational Models”, IEPC-2011-122, 32nd International Electric Propulsion Conference, Kurhaus, Wiesbaden, Germany (Sept. 2011) https://www.researchgate.net/publication/267959565

Conversano R., Wirz R.E., “CubeSat Lunar Mission Using a Miniature Ion Thruster,” AIAA-2011-6083, 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, San Diego, CA (July 2011) https://doi.org/10.2514/6.2011-6083

Wirz R.E., Johnson P., “Aero-Structural Performance of Multiplane Wind Turbine Blades,” AIAA-2011-3025, 29th AIAA/ASME/SAE/ASEE Applied Aerodynamics Conference, Honolulu, Hawaii (June 2011) https://doi.org/10.2514/6.2011-3025 

Mao H.-S., Wirz R.E., “Comparison of Charged Particle Tracking Methods for Non-Uniform Magnetic Fields”, AIAA-2011-3739, 42nd AIAA Plasmadynamics and Lasers Conference, Honolulu, Hawaii (June 2011) https://doi.org/10.2514/6.2011-3739 

Araki S.J., Wirz R.E., “Collision Modeling for High Velocity Ions in a Quiescent Gas” AIAA-2011-3740, 42nd AIAA Plasmadynamics and Lasers Conference, Honolulu, Hawaii (June 2011) https://doi.org/10.2514/6.2011-3740 

Aspe S., Wirz R.E., “Computational Model for Vertical Axis Wind Turbine (VAWT) Design,” Wind Power 2011, Anaheim, CA (May 2011) (Poster Session)

Tarzi Z., Speyer J., Wirz R.E., “Optimum Low-Thrust Elliptical Transfer for Power Limited Spacecraft using Numerical Averaging and Continuously Variable Thrust,” Proceedings of the 21st AAS Space Flight Mechanics Meeting, pp. 11-234, New Orleans, LA (Feb. 2011)

Wirz R.E., “Coupled Analysis of Ion Thruster Grid Erosion and Electron Backstreaming,” Space Propulsion 2010, San Sebastian, Spain (May 2010)

Marrese-Reading, C.M., Ziemer, J.K., Scharf, D.P., Martin-Mur, T.J., Thompson, P., Mueller, J., Wirz R.E., “Mission enabling and enhancing spacecraft capabilities with microNewton electric propulsion,” IEEE Aerospace Conference, Big Sky, MT (March 2010) 10.1109/AERO.2010.5447032

Martin S.R., Scharf D.P., Wirz R.E., Purceli G., Rodriguez J., “A Mid-Infrared Space Observatory for Characterizing Exoplanets,” ASP Conference Series Vol.430, Barcelona, Spain (Sept. 2009) http://adsabs.harvard.edu/full/2010ASPC..430..493M

Wirz R.E., “Long Duration Assessment of Electron Backstreaming for Ion Optics,” IEPC-2009-164, 31st International Electric Propulsion Conference, Ann Arbor, MI (Sept. 2009) http://erps.spacegrant.org/uploads/images/images/iepc_articledownload_1988-2007/2009index/IEPC-2009-164.pdf

Marrese-Reading, C.M., Ziemer, J.K., Scharf, D.P., Martin-Mur, T.J., Thompson, P., Mueller, J., Wirz R.E., “MicroNewton Electric Propulsion Requirements to Enhance or Enable Future NASA Missions,” IEPC-2009-216, 31st International Electric Propulsion Conference, Ann Arbor, Michigan (Sept. 2009)

Tarzi Z., Speyer J., Wirz R.E., “Optimum Low-Thrust Transfer between Arbitrary Elliptic Orbits for Power-Limited Spacecraft using Asymptotic Expansions and Averaging,” IEPC-2009-222, 31st International Electric Propulsion Conference, Ann Arbor, Michigan (Sept. 2009) http://erps.spacegrant.org/uploads/images/images/iepc_articledownload_1988-2007/2009index/IEPC-2009-222.pdf

Marrese-Reading, C., St. Vaughn, J., Prakash, R., Singh, G., Frisbee, R., Mandic, M., Pain, R., Slade, W., Rooney, D., Leipold, D., Ramos, A., Pierce, D., Corliss, J., Tutterow, R., True, W., Robbins, R., Barr, D., Stephens, J., Wirz R.E., “Orion spacecraft nominal and contingency earth landing retro rocket system options,” IEEE Aerospace Conference, Big Sky, MT (March 2009) 10.1109/AERO.2009.4839349

Wirz R.E., Katz I., Goebel D., Anderson J., “Electron Backstreaming Determination for Ion Thrusters,” AIAA-2008-4732, 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Hartford, CT (July 2008) https://doi.org/10.2514/6.2008-4732 

Wirz R.E., Anderson J., Katz I., Goebel D., “Time-Dependent Erosion of Ion Optics,” AIAA-2008-4529, 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Hartford, CT (July 2008) https://doi.org/10.2514/6.2008-4529 

Lengyel A., Wirz R.E., “Miniature Valve for Xenon Thrusters,” AIAA-2008-5085, 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Hartford, CT (July 2008) https://doi.org/10.2514/6.2008-5085 

Goebel D.M., Polk J., Wirz R.E., Snyder J.S., Mikellides I.G., Katz I., Anderson J. “Qualification of Commercial XIPS Ion Thrusters for NASA Deep Space Missions,” AIAA-2008-4914, 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Hartford, CT (July 2008) https://doi.org/10.2514/6.2008-4914 

Mueller J., Ziemer J., Hofer R., Wirz R.E., O’Donnell T., “A Survey of Micro-Thrust Propulsion Options for Microspacecraft and Formation Flying Missions,” 5th Annual CubeSat Developers Workshop, San Luis Obispo, CA (April 2008) https://www.researchgate.net/publication/268414397

Martin, S., Scharf, D.P., Wirz R.E., Lay O., McKinstry D., Mennesson B., Purcell G., Rodriguez J., Scherr L., Smith J.R., Wayne L., “Design Study for a Planet-Finding Space Interferometer,” IEEE Aerospace Conference, Big Sky, MT (March 2008) 10.1109/AERO.2008.4526410

Wirz R.E., Anderson J. R., Goebel D., Katz I., “XIPS Ion Thruster Grid Erosion Assessment for Deep Space Missions,” IEPC-2007-265, 30th International Electric Propulsion Conference, Florence, Italy (Sept. 2007) http://erps.spacegrant.org/uploads/images/images/iepc_articledownload_1988-2007/2007index/IEPC-2007-265.pdf

Martin S., Scharf D., Wirz R.E., Lay O., McKinstry D., Mennesson B., Purcell G., Rodriguez J., Scherr L., Smith J. R., Wayne L., “TPF-Emma: concept study of a planet finding space interferometer,” Proc. SPIE Vol. 6693, Techniques and Instrumentation for Detection of Exoplanets III, San Diego, CA (Sept. 2007) https://doi.org/10.1117/12.734835

Wirz R.E., Shariff S., “Ground Effects for CEV Vertical Retrorockets,” AIAA-2007-5758, 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH (July 2007) https://doi.org/10.2514/6.2007-5758 

Wirz R.E., Goebel D., “Ion Thruster Discharge Performance per Magnetic Field Topography,” AIAA 2006-4487, 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Sacramento, CA (July 2006) (Best Paper of “Ion Thruster Physics and Modeling” Session) https://doi.org/10.2514/6.2006-4487 

Wirz R.E., Sullivan R., Przybylowski J., Silva M., “Discharge Hollow Cathode and Extraction Grid Analysis for the MiXI Ion Thruster,” AIAA 2006-4498, 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Sacramento, CA (July 2006), https://doi.org/10.2514/6.2006-4498 

Goebel D., Wirz R.E., Katz I., “Analytical Ion Thruster Discharge Performance Model,” AIAA 2006-4486, 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Sacramento, CA (July 2006) https://doi.org/10.2514/6.2006-4486 

Katz I., Mikellides I., Goebel D., Jameson K., Wirz R.E., Johnson L., “Production of High Energy Ions Near an Ion Thruster Discharge Hollow Cathode,” AIAA-2006-4485, 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Sacramento, CA (July 2006) https://doi.org/10.2514/6.2006-4485 

Li Y., Hamlin L., Wirz R.E., Adams D., Moore G., Coppolino R., Peng C., Levine M., “Dynamic Simulations for the Terrestrial Planet Finder Interferometer,” Space Systems Optomechanics and Dynamics II, SPIE Conference, San Diego, CA (Aug. 2005) https://doi.org/10.1117/12.620012

Katz I., Mikellides I., Wirz R.E., J. Anderson, D. Goebel, “Ion Thruster Life Models,” AIAA-2005-4256, 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Tucson, AZ (July 2005) https://doi.org/10.2514/6.2005-4256 

Wirz R.E., Katz I., “Plasma Processes of DC Ion Thruster Discharge Chambers,” AIAA 2005-3690, 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Tucson, AZ (July 2005) https://doi.org/10.2514/6.2005-3690 

Wirz R.E., “Computational Modeling of a Miniature Ion Thruster Discharge,” AIAA-2005-3887, 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Tucson, AZ (July 2005) https://doi.org/10.2514/6.2005-3887

Wirz R.E., Gale M., Mueller J., Marrese C., “Miniature ion thruster for precision formation flying,” AIAA 2004-4115, 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Fort Lauderdale, FL (July 2004) https://doi.org/10.2514/6.2004-4115 

Wirz R.E., Katz I., “2-D Discharge Chamber Model for Ion Thrusters,” AIAA-2004-4107, 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Ft. Lauderdale, FL (July 2004) https://doi.org/10.2514/6.2004-4107 

Brophy J., Anderson J., Beatty J., Goebel D., Goodfellow K., Johnson L., Katz I., Kolasinski R., Marrese C., Polk J., Sengupta A., Snyder S., Wirz R.E., “The Status of Ion Propulsion Development and Implementation at JPL in 2003,” AIAA 2003-4711, 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Huntsville, AL (July 2003) https://doi.org/10.2514/6.2003-4711 

Wirz R.E., Katz I., “A Preliminary 2-D Computational Model of an Ion Thruster Discharge Chamber,” AIAA-2003-5163, 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Huntsville, AL (July 2003) https://doi.org/10.2514/6.2003-5163 

Wirz R.E., Goebel D., Marrese C., Mueller J., “Development of Cathode Technologies for a Miniature Ion Thruster,” AIAA-2003-4722, 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Huntsville, AL (July 2003) https://doi.org/10.2514/6.2003-4722 

Katz I., Anderson J., Goebel D., Wirz R.E., Sengupta A., “Plasma Generation Near an Ion Thruster Discharge Chamber Hollow Cathode,” AIAA 2003-5161, 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Huntsville, AL (July 2003) http://hdl.handle.net/2014/39043

Mueller J., Marrese C., Ziemer J., Green A., Yang E-H., Mojarradi M., Johnson T., White V., Bame D., Wirz R., Tajmar M., Hruby V., Gamero-Castano M., Schein J., Reinicke R., “JPL Micro-Thrust Propulsion Activities,” AIAA 2002-5714, NanoTech 2002, Houston, TX (Sept. 2002) https://doi.org/10.2514/6.2002-5714 

Wirz R.E., Polk J., Marrese C., Mueller J., “Experimental and Computational Investigation of the Performance of a Micro-Ion Thruster,” AIAA-2002-3835, 38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Indianapolis, IN (July 2002) https://doi.org/10.2514/6.2002-3835 

Wirz R.E., Polk J., Marrese C., Mueller J., Escobedo J., Sheehan P. “Development and Testing of a 3cm Electron Bombardment Micro-Ion Thruster,” IEPC 01-343, 27th International Electric Propulsion Conference, Pasadena, CA (Jan. 2001) http://erps.spacegrant.org/uploads/images/images/iepc_articledownload_1988-2007/2001index/343_1.pdf