The plasma boundary in Single Helical Axis RFP plasmas

Details The plasma boundary in Single Helical Axis RFP plasmas The plasma boundary in Single Helical Axis RFP plasmas

2009-09-16

arxiv.org/abs/0909.3011v2

Nucl. Fusion 50 (2010) 035014

Physics

Plasma Physics

12 pages, 9 figures Submitted to Nuclear Fusion

Scientific paper

10.1088/0029-5515/50/3/035014

Single Helical Axis (SHAx) states obtained in high current reversed field pinch (RFP) plasmas display, aside from a dominant mode in the m=1 spectrum, also a dominant m=0 mode, with the same toroidal mode number as the m=1 one. The two modes have a fixed phase relationship. The island chain created by the m=0 mode across the reversal surface gives rise, at shallow reversal of the toroidal field, to an X-point structure which separates the last closed flux surface from the first wall, creating a divertor-like configuration. The plasma-wall interaction is found to be related to the connection length of the field lines intercepting the wall, which displays a pattern modulated by the dominant mode toroidal periodicity. This configuration, which occurs only for shallow toroidal field reversal, could be exploited to realize an island divertor in analogy to stellarators.

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