Identification of fast particle triggered modes by means of correlation electron cyclotron emission on Tore Supra

被引：8

作者：

Goniche, M. ^{[1
]}

Huysmans, G. T. A. ^{[1
]}

Turco, F. ^{[1
]}

Maget, P. ^{[1
]}

Segui, J. L. ^{[1
]}

Artaud, J. F. ^{[1
]}

Giruzzi, G. ^{[1
]}

Imbeaux, F. ^{[1
]}

Lotte, P. ^{[1
]}

Mazon, D. ^{[1
]}

Molina, D. ^{[1
]}

Udintsev, V. S. ^{[2
]}

机构：

[1] CEA Cadarache, Assoc EURATOM CEA DRFC SCCP CEA, F-13108 St Paul Les Durance, France

[2] EPFL SB CRPP, Assoc EURATOM Confederat Suisse, CH-1015 Lausanne, Switzerland

来源：

FUSION SCIENCE AND TECHNOLOGY | 2008年 / 53卷 / 01期

关键词：

fast particles; Alfven eigenmode; electron fishbone mode;

D O I：

10.13182/FST08-A1656

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Low-frequency (5- to 20-kHz) and high-frequency (40- to 200-kHz) modes are studied during radio-frequency heating experiments on the Tore Supra tokamak by means of correlation electron cyclotron emission. High-frequency modes are detected when the plasma is heated by ion cyclotron range of frequency waves in the minority D(H) heating scheme in combination with lower hybrid current drive (LHCD) producing a flat or slightly reversed q-profile. They are identified as Alfven cascade modes. When this mode is triggered, fast ion losses (< 20%) are detected from the neutron emission rate, and an additional heat load on plasma-facing components can be measured by an infrared camera when the fast ion energy is sufficiently large. Low-frequency modes are commonly triggered during LHCD experiments performed at low loop voltage. This mode can be observed with moderate lower hybrid power when the q-profile is monotonic or at higher power when the q-profile is flat in the core (r/a < 0.2) or reversed. It is identified, in most cases, as an electron fishbone-like mode. These modes can be stabilized by a slight modification of the q-profile provided by an increase of lower hybrid power or by a small addition of electron cyclotron current device.

引用

页码：88 / 96

页数：9

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