Transient behaviour in the plasma core of TJ-II stellarator and its relation with rational surfaces

被引：22

作者：

Estrada, T ^{[1
]}

de la Luna, E ^{[1
]}

Ascasíbar, E ^{[1
]}

Jiménez, JA ^{[1
]}

Castejón, F ^{[1
]}

García-Cortés, I ^{[1
]}

López-Fraguas, A ^{[1
]}

Sánchez, J ^{[1
]}

Tribaldos, V ^{[1
]}

机构：

[1] CIEMAT, EURATOM Assoc, Lab Nacl Fus Confinamiento Magnet, E-28040 Madrid, Spain

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2002年 / 44卷 / 08期

关键词：

D O I：

10.1088/0741-3335/44/8/313

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：

A transient behaviour is observed in the plasma core of TJ-II stellarator with fast drops in the electron temperature. Changes in the line-averaged density are observed synchronized with temperature drops. This phenomenon appears in plasmas created and heated using 300 kW of electron cyclotron heating with high power density. The transient behaviour resembles both, the electric pulsation discovered in CHS and the 'electron root' feature reported by the W7-AS team. The flexibility and low magnetic shear of TJ-II have permitted the identification of the plasma current as the control parameter for the appearance of this phenomenon. The results obtained during the magnetic configuration scans carried out in TJ-II points to the hypothesis that the transient behaviour is connected with the presence of a rational surface close to the plasma centre. Equilibrium calculations performed with the VMEC code reinforce this hypothesis.

引用

页码：1615 / 1624

页数：10

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