Abstract
It has been shown that transport barriers in toroidal magnetically confined plasmas tend to be linked to regions of unique magnetic topology such as the location of a minimum in the safety factor, rational surfaces or the boundary between closed and open flux surfaces. In the absence ofE×B sheared flows, fluctuations are expected to show maximum amplitude near rational surfaces, and plasma confinement might tend to deteriorate. On the other hand, if the generation ofE×B sheared flows were linked to low order rational surfaces, these would be beneficial for confinement. Experimental evidence ofE×B sheared flows linked to rational surfaces has been obtained in the plasma edge region of the TJ-II stellarator.
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Pedrosa, M.A., Hidalgo, C., López-Fraguas, A. et al. Role of rational surfaces on fluctuations and transport in the plasma edge of the TJ-II stellarator. Czech J Phys 50, 1463–1470 (2000). https://doi.org/10.1023/A:1022859915916
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DOI: https://doi.org/10.1023/A:1022859915916