High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

被引：46

作者：

Blanchard, P ^{[1
]}

Alberti, S ^{[1
]}

Coda, S ^{[1
]}

Weisen, H ^{[1
]}

Nikkola, P ^{[1
]}

Klimanov, I ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, EURATOM Assoc, COnfederat Suisse, Ctr Rech Phys Plasmas, CH-1015 Lausanne, Switzerland

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2002年 / 44卷 / 10期

关键词：

D O I：

10.1088/0741-3335/44/10/310

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 electron cyclotron emission (ECE) from the high field side of the TCV tokamak have been made on plasmas heated by second and third harmonic X-mode electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD). Suprathermal ECE, up to a factor of six in excess of thermal emission, is detected in the presence of second harmonic X-mode (X2) ECCD and of third harmonic X-mode (X3) ECH. The measured ECE spectra are modelled using a bi-Maxwellian describing the bulk and the suprathermal electron populations. Suprathermal temperatures between 10 and 50 keV and densities in the range 1 x 10(17)-6 x 10(18) m(-3) are obtained, and correspond to 3-15 bulk temperatures and 1-20% bulk densities. Good agreement between ECE suprathermal temperatures and energetic photon temperatures, measured by a hard x-ray camera, is found. For optically thin X3 low field side injection in the presence of X2 CO-ECCD, the suprathermal population partly explains the discrepancy between global and first pass absorption measurements.

引用

页码：2231 / 2249

页数：19

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