Effect of resonant helical magnetic fields on plasma rotation

Yu, Q.; Günter, S.; Finken, K. H.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042301
Academic Journal
The effect of a resonant helical magnetic field on plasma rotation is investigated numerically based on the two fluid equations. It is found that depending on the frequency and the direction of the original plasma rotation, a static helical field of a small amplitude can either increase or decrease the rotation speed. With increasing the field amplitude, the plasma rotation frequency approaches the electron diamagnetic drift frequency but rotates in the ion drift direction. These results provide a new understanding of the recent experimental observations of TEXTOR [K. H. Finken et al., Phys. Rev. Lett. 94, 015003 (2005)].


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