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.
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页数：13
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