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Author(s):
T. Takahashi, Y. Tomita, H. Momota and Nikita V. Shabrov
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Title:
Collisionless Pitch Angle Scattering of Plasma Ions at the Edge Region of an FRC
Date of publication:
July 1997
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Key words:
FRC, D-^3He Fusion, Action Integral, Pitch Angle Scattering
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Abstract:
Motion of a plasma ion gyrating around the separatrix of a field-reversed configuration is studied. Numerical studies showed that action integral of a particle changes abruptly when a particle passes through the vicinity of a field null x-point. This phenomena is understood as collisionless stochastic scattering of pitch angle. In case of a particle with positive canonical angular momentum P_theta , resultant correlation coefficients of action integral between before and after the scattering appear to be stochastic in some cases. As action integral increases for a particle with negative P_theta , Its motion tends to be adiabatic. If negative P_theta of a particle approaches to zero, a stochastic motion is observed.
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