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On the magnetic mirror effect in Hall thrusters

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2 Author(s)
Keidar, M. ; Department of Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109 ; Boyd, I.D.

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The magnetic mirror effect is studied in the channel of a Hall thruster. It is shown that gradients in magnetic field affect the presheath structure and electric potential distribution. The length of the radial presheath region decreases in the presence of a magnetic field gradient. The two-dimensional potential shape can be affected by proper choice of the magnetic mirror ratio. In particular, it is possible to obtain a concave shape of the potential profile in the channel even in the case of a primarily radial magnetic field. This, in turn, can be used to efficiently control the ion dynamics in the acceleration region.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 12 )