Beta-dependence of energetic particle-driven instabilities in spherical tokamaks

被引：53

作者：

Gryaznevich, MP ^{[1
]}

Sharapov, SE ^{[1
]}

机构：

[1] EURATOM, UKAEA Fus Assoc, Culham Sci Ctr, Abingdon OX14 4DB, Oxon, England

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2004年 / 46卷 / 07期

关键词：

D O I：

10.1088/0741-3335/46/7/S02

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：

Extensive data on energetic particle-driven (EPD) modes in the tight-aspect ratio MAST and START experiments with super-Alfvenic neutral beam injection is reviewed. The dependence of toroidal Alfven eigenmodes (TAEs) and frequency-sweeping 'chirping' modes on the thermal plasma P-value is investigated experimentally, and a decrease both in the mode amplitudes and in the number of unstable modes with increasing P is found, in line with theoretical expectations. 'Fishbone' modes in MAST are seen at higher beta-values than TAEs or 'chirping' modes, and occasionally are found to trigger long-lasting modes, which may affect global MHD stability. In the light of the data analysis the possible importance of EPD instabilities in larger burning plasma spherical tokamaks, which would necessarily operate in high-beta regimes, is discussed.

引用

页码：S15 / S29

页数：15

共 35 条

[1] Transport and confinement in the mega ampere spherical tokamak (MAST) plasma [J].

Akers, RJ ;

Ahn, JW ;

Antar, GY ;

Appel, LC ;

Applegate, D ;

Brickley, C ;

Bunting, C ;

Carolan, PG ;

Challis, CD ;

Conway, NJ ;

Counsell, GF ;

Dendy, RO ;

Dudson, B ;

Field, AR ;

Kirk, A ;

Lloyd, B ;

Meyer, HF ;

Morris, AW ;

Patel, A ;

Roach, CM ;

Rohzansky, V ;

Sykes, A ;

Taylor, D ;

Tournianski, MR ;

Valovic, M ;

Wilson, HR ;

Axon, KB ;

Buttery, RJ ;

Ciric, D ;

Cunningham, G ;

Dowling, J ;

Dunstan, MR ;

Gee, SJ ;

Gryaznevich, MP ;

Helander, P ;

Keeling, DL ;

Knight, PJ ;

Lott, F ;

Loughlin, MJ ;

Manhood, SJ ;

Martin, R ;

McArdle, GJ ;

Price, MN ;

Stammers, K ;

Storrs, J ;

Walsh, MJ .

PLASMA PHYSICS AND CONTROLLED FUSION, 2003, 45 (12 A) :A175-A204

[2] Neutral beam heating in the START spherical tokamak [J].

Akers, RJ ;

Appel, LC ;

Carolan, PG ;

Conway, NJ ;

Counsell, GF ;

Cox, M ;

Gee, SJ ;

Gryaznevich, MP ;

Martin, R ;

Morris, AW ;

Nightingale, MPS ;

Sykes, A ;

Mironov, M ;

Walsh, MJ .

NUCLEAR FUSION, 2002, 42 (02) :122-135

[3] MORE ON CORE-LOCALIZED TOROIDAL ALFVEN EIGENMODES [J].

BERK, HL ;

VANDAM, JW ;

BORBA, D ;

CANDY, J ;

HUYSMANS, GTA ;

SHARAPOV, S .

PHYSICS OF PLASMAS, 1995, 2 (09) :3401-3406

[4]

Berk HL, 1998, PHYS LETT A, V238, P408

[5] STABILITY OF ALFVEN GAP MODES IN BURNING PLASMAS [J].

BETTI, R ;

FREIDBERG, JP .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1992, 4 (06) :1465-1474

[6] THEORY OF MAGNETOHYDRODYNAMIC INSTABILITIES EXCITED BY ENERGETIC PARTICLES IN TOKAMAKS [J].

CHEN, L .

PHYSICS OF PLASMAS, 1994, 1 (05) :1519-1522

[7] Fast particle destabilization of toroidal Alfven eigenmodes [J].

Cheng, CZ ;

Gorelenkov, NN ;

Hsu, CT .

NUCLEAR FUSION, 1995, 35 (12) :1639-1650

[8] Nonlinear splitting of fast particle driven waves in a plasma: Observation and theory [J].

Fasoli, A ;

Breizman, BN ;

Borba, D ;

Heeter, RF ;

Pekker, MS ;

Sharapov, SE .

PHYSICAL REVIEW LETTERS, 1998, 81 (25) :5564-5567

[9] Wave driven fast ion loss in the National Spherical Torus Experiment [J].

Fredrickson, ED ;

Cheng, CZ ;

Darrow, D ;

Fu, G ;

Gorelenkov, NN ;

Kramer, G ;

Medley, SS ;

Menard, J ;

Roquemore, L ;

Stutman, D ;

White, RB .

PHYSICS OF PLASMAS, 2003, 10 (07) :2852-2862

[10] EXISTENCE OF CORE LOCALIZED TOROIDICITY-INDUCED ALFVEN EIGENMODE [J].

FU, GY .

PHYSICS OF PLASMAS, 1995, 2 (04) :1029-1031

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