Explanation of the JET n=0 chirping mode

被引：157

作者：

Berk, H. L. ^{[1
]}

Boswell, C. J.

Borba, D.

Figueiredo, A. C. A.

Johnson, T.

Nave, M. F. F.

Pinches, S. D.

Sharapov, S. E.

机构：

[1] Univ Texas, Inst Fus Studies, Austin, TX 78712 USA

[2] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[3] Inst Super Tecn, EURATOM Assoc, Ctr Fusao Nucl, P-1049001 Lisbon, Portugal

[4] EFDA, Close Support Unit, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[5] KTH, Euratom VR Assoc, Alfven Lab, Gothenburg, Sweden

[6] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany

[7] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

来源：

NUCLEAR FUSION | 2006年 / 46卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1088/0029-5515/46/10/S04

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：

Persistent rapid up and down frequency chirping modes with a toroidal mode number of zero (n = 0) are observed in the JET tokamak when energetic ions, in the range of several hundred keV, are created by high field side ion cyclotron resonance frequency heating. Fokker-Planck calculations demonstrate that the heating method enables the formation of an energetically inverted ion distribution which supplies the free energy for the ions to excite a mode related to the geodesic acoustic mode. The large frequency shifts of this mode are attributed to the formation of phase space structures whose frequencies, which are locked to an ion orbit bounce resonance frequency, are forced to continually shift so that energetic particle energy can be released to counterbalance the energy dissipation present in the background plasma.

引用

页码：S888 / S897

页数：10

共 31 条

[1] Spontaneous hole-clump pair creation in weakly unstable plasmas [J].