Quasicoherent modes on the COMPASS tokamak

被引：19

作者：

Melnikov, A. V. ^{[1
,2
]}

Markovic, T. ^{[3
,4
]}

Eliseev, L. G. ^{[1
]}

Adamek, J. ^{[3
]}

Aftanas, M. ^{[3
]}

Bilkova, P. ^{[3
]}

Boehm, P. ^{[3
]}

Gryaznevich, M. ^{[5
,6
]}

Imrisek, M. ^{[3
]}

Lysenko, S. E. ^{[1
]}

Medvedev, S. Yu ^{[2
,7
]}

Panek, R. ^{[3
]}

Peterka, M. ^{[3
]}

Seidl, J. ^{[3
]}

Stefanikova, E. ^{[3
]}

Stockel, J. ^{[3
]}

Weinzettl, V. ^{[3
]}

机构：

[1] Kurchatov Inst, Natl Res Ctr, Moscow 123182, Russia

[2] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia

[3] Inst Plasma Phys AS CR, Tokamak Dept, Prague, Czech Republic

[4] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

[5] Tokamak Energy Ltd, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[6] Tech Univ Denmark, DK-2800 Lyngby, Denmark

[7] RAS, Keldysh Inst Appl Math, Moscow 117901, Russia

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2015年 / 57卷 / 06期

基金：

俄罗斯科学基金会;

关键词：

tokamak; MHD modes; Alfven eigenmodes; INDUCED ALFVEN EIGENMODES; BALL-PEN; PLASMAS;

D O I：

10.1088/0741-3335/57/6/065006

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：

Multiple quasicoherent electromagnetic modes with steady-state frequency and different nature and location were observed in the COMPASS tokamak (R = 0.56 m, < a > = 0.2 m) at B-t = 1.14T with Co-NBI (P-NBI = 0.2-0.5 MW, E-b = 32 keV) at frequencies 5 kHz < f < 250 kHz. Modes were observed in both low and high confinement (L- and H-modes) plasmas. Lower frequency modes with f < 50 kHz were identified as low m tearing and kink MHD modes, while higher frequency modes with 50 kHz < f < 250 kHz were considered as having Alfvenic nature. Unexpectedly, such modes were only observed in the H-mode, both in neutral beam injector-assisted and Ohmic, so the mode driving force is not yet clear. Using the linear MHD code KINX, we initially identified the observed mode with a ballooning structure is as beta induced Alfven eigenmode (BAE) with m, n < 5, while an antiballooning mode is initially identified as toroidal Alfven eigenmode (TAE) with m, n < 9.

引用

页数：13

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