Role of rational surfaces on fluctuations and transport in the plasma edge of the TJ-II stellarator |
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Authors: | M A Pedrosa C Hidalgo A López-Fraguas B Ph Van Milligen R Balbín J A Jiménez E Sánchez J Castellano TJ-II Team L García B A Carreras V E Lynch |
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Institution: | (1) Laboratorio Nacional de Fusión por Confinamiento Magnético, Asociación EURATOM-CIEMAT, 28040 Madrid, Spain;(2) Universidad Carlos III, 28911 Madrid, Spain;(3) Oak Ridge National Laboratory, 37831-8070 Oak Ridge, Tennessee, USA |
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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.
Presented at the Workshop on the Role of Electric Fields in Plasma Confinement and Exhaust, Budapest, 18–19 June, 2000. |
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