Influence of low-order rational magnetic surfaces on heat transport in TJ-II heliac ECRH plasmas

被引：44

作者：

Castejón, F ^{[1
]}

López-Bruna, D ^{[1
]}

Estrada, T ^{[1
]}

Ascasíbar, E ^{[1
]}

Zurro, B ^{[1
]}

Baciero, A ^{[1
]}

机构：

[1] CIEMAT, Confinamiento Magnet Asociac Euratom, Lab Nacl Fus, E-28040 Madrid, Spain

来源：

NUCLEAR FUSION | 2004年 / 44卷 / 05期

关键词：

D O I：

10.1088/0029-5515/44/5/003

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We study the effect of low-order rational surfaces on electron heat transport in plasmas confined in the TJ-II stellarator (Alejaldre et al 1990 Fusion Technol. 17 131) and heated by electron cyclotron waves. Enhancement of core electron heat confinement is observed when the rational surface is placed in the vicinity of the power deposition zone, either by performing a magnetic configuration scan or by inducing Ohmic current in a single discharge. The key to improving heat confinement seems to be a locally strong positive radial electric field, which is made possible by a synergistic effect between enhanced electron heat fluxes through radial positions around low-order rationals and pump out mechanisms in the heat deposition zone.

引用

页码：593 / 599

页数：7

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