Magnetic field structure influence on primary electron cusp losses for micro-scale discharges

TitleMagnetic field structure influence on primary electron cusp losses for micro-scale discharges
Publication TypeJournal Article
Year of Publication2014
AuthorsDankongkakul, Ben, Samuel J. Araki, and Richard E. Wirz
JournalPhysics of Plasmas
Volume21
Issue4
Date Published04/2014
AbstractAn experimental effort was used to examine the primary electron loss behavior for micro-scale (< 3 cm diameter) discharges. The experiment uses an electron flood gun source and an axially aligned arrangement of ring-cusps to guide the electrons to a downstream point cusp. Measurements of the electron current collected at the point cusp show an unexpectedly complex loss pattern with azimuthally periodic structures. Additionally, in contrast to conventional theory for cusp losses, the overall radii of the measured collection areas are over an order of magnitude larger than the electron gyroradius. Comparing these results to Monte Carlo particle tracking simulations and a simplified analytical analysis shows that azimuthal asymmetries of the magnetic field far upstream of the collection surface can substantially affect the electron loss structure and overall loss area.
URLhttp://scitation.aip.org/content/aip/journal/pop/21/4/10.1063/1.4871724
DOI10.1063/1.4871724

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