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Achieving a steady state field-reversed configuration by means of two counter-rotating magnetic fields


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Visentin, DC and Hugrass, WN 2008 , 'Achieving a steady state field-reversed configuration by means of two counter-rotating magnetic fields', paper presented at the Australian Institute of Physics (AIP) 18th National Congress, 30 November - 5 December 2008, Adelaide, South Australia.

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A field-reversed configuration may be sustained by a rotating magnetic field (RMF) which entrains the electron
fluid and maintains the plasma current (the (-) RMF). This current would eventually decay as the ion fluid is
accelerated through momentum transfer collisions with the electron fluid. A true steady state operation may be
achieved by applying a second counter-RMF (the (+) RMF) which imparts angular momentum to the ion fluid,
thereby overcoming the collisional torque. We present a theoretical model of RMF current drive demonstrating the
physical basis of the scheme, derive the conditions required for successful operation and present simulation results.
Both RMFs may penetrate much farther than the classical skin depth due to nonlinear effects. The required
external RMF magnitudes are of the same order for both RMFs and follow the same scaling law. The (+) RMF
magnitude required for penetration is much larger than that required to sustain the steady state, providing two
critical values for (the ratio of the electron cyclotron frequency in the (+) RMF and the electron ion collision
frequency), which scale linearly with (the ratio of the plasma radius and the classical skin depth for the
frequency of the (+) RMF).

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Visentin, DC and Hugrass, WN
Journal or Publication Title: Australian Institute of Physics, 18th National Congress
ISSN: ISBN 1-876346-57-4
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Copyright © 2008 AIP

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