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The plasma boundary in Single Helical Axis RFP plasmas

Authors :
Stefano Munaretto
P. Innocente
R. Lorenzini
Emilio Martines
Monica Spolaore
B. Momo
Martines, E
Lorenzini, R
Momo, B
Munaretto, S
Innocente, P
Spolaore, M
Source :
Nuclear fusion 50 (2010): 035014. doi:10.1088/0029-5515/50/3/035014, info:cnr-pdr/source/autori:Martines E.; Lorenzini R.; Momo B.; Munaretto S.; Innocente P.; Spolaore M./titolo:The plasma boundary in single helical axis RFP plasmas/doi:10.1088%2F0029-5515%2F50%2F3%2F035014/rivista:Nuclear fusion/anno:2010/pagina_da:035014/pagina_a:/intervallo_pagine:035014/volume:50
Publication Year :
2009

Abstract

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.<br />12 pages, 9 figures Submitted to Nuclear Fusion

Details

Language :
English
Database :
OpenAIRE
Journal :
Nuclear fusion 50 (2010): 035014. doi:10.1088/0029-5515/50/3/035014, info:cnr-pdr/source/autori:Martines E.; Lorenzini R.; Momo B.; Munaretto S.; Innocente P.; Spolaore M./titolo:The plasma boundary in single helical axis RFP plasmas/doi:10.1088%2F0029-5515%2F50%2F3%2F035014/rivista:Nuclear fusion/anno:2010/pagina_da:035014/pagina_a:/intervallo_pagine:035014/volume:50
Accession number :
edsair.doi.dedup.....2abd625b6f2e13c8a145050b017e0532
Full Text :
https://doi.org/10.1088/0029-5515/50/3/035014