Measurements of ICRF loading on DIII-D with and without a Faraday shield

被引：14

作者：

Swain, DW ^{[1
]}

Pinsker, RI ^{[1
]}

Baity, FW ^{[1
]}

Carter, MD ^{[1
]}

deGrassie, JS ^{[1
]}

Doyle, EJ ^{[1
]}

Hanson, GR ^{[1
]}

Kim, KW ^{[1
]}

Moyer, RA ^{[1
]}

Petty, CC ^{[1
]}

机构：

[1] GEN ATOM CO, SAN DIEGO, CA USA

来源：

NUCLEAR FUSION | 1997年 / 37卷 / 02期

关键词：

D O I：

10.1088/0029-5515/37/2/I06

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：

Measurements of radiofrequency (RF) loading on the Doublet III D shape (DIII-D) tokamak using a fast wave ion cyclotron antenna with and without a Faraday shield present indicate that the loading resistance seen by the antenna is significantly higher at low values of RF power (P less than or equal to 20 kW with no Faraday shield) than is predicted by standard fast wave antenna coupling theory. Measurements of the density profile in the plasma edge region allow a direct comparison of calculated and measured loading. At high power, the calculated fast wave loading agrees with the measurements. The high loading observed at low power can be explained by direct losses in an RF enhanced sheath. The density value at the current strap of; approximate to 4 x 10(10) cm(-3) needed to give the observed loading behaviour is in agreement with the measured density values in the plasma scrape-off region, extrapolated to the current strap location using a simple Bohm diffusion model.

引用

页码：211 / 224

页数：14

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