LOCAL MAGNETIC SHEAR CONTROL IN A TOKAMAK VIA FAST-WAVE MINORITY ION CURRENT DRIVE - THEORY AND EXPERIMENTS IN JET

被引:73
作者
BHATNAGAR, VP
START, DFH
JACQUINOT, J
CHALAND, F
CHERUBINI, A
PORCELLI, F
机构
[1] JET Joint Undertaking, Abingdon
关键词
D O I
10.1088/0029-5515/34/12/I04
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
When an ion cyclotron resonance heating (ICRH) antenna array is phased (Delta phi not equal 0 or pi), the excited asymmetric k(p)arallel to spectrum can drive non-inductive currents by interaction of fast waves both with electrons (transit time magnetic pumping (e-TTMP) and Landau damping (e-LD)) and with ions at minority (fundamental) or harmonic cyclotron resonances, depending upon the scenario. On the basis of earlier theories, a simplified description is presented that includes the minority ion and electron current drive effects simultaneously in a 3-D ray tracing calculation in the tokamak geometry. The experimental results of sawtooth stabilization or destabilization in JET using the minority ion current drive scheme are presented. This scheme allows a modification of the local current density gradient (or the magnetic shear) at the q = 1 surface resulting in a control of sawteeth. The predictions of the above model of current drive and its effects on sawtooth period calculated in conjunction with a model of stability of internal resistive kink modes, that encompasses the effects of bath the fast particle pressure and the local (q = 1) magnetic shear, are found to be qualitatively in good agreement with the experimental results. Further, the results are discussed of our model of fast wave current drive scenarios of magnetic shear reversal with a view to achieving long duration high confinement regimes in the forthcoming experimental campaign on JET. Finally, the results are presented of minority current drive for sawtooth control in next step devices such as the International Thermonuclear Experimental Reactor (ITER).
引用
收藏
页码:1579 / 1603
页数:25
相关论文
共 44 条
[1]   A 3-D ANALYSIS OF THE COUPLING CHARACTERISTICS OF ION-CYCLOTRON RESONANCE HEATING ANTENNAE [J].
BHATNAGAR, VP ;
KOCH, R ;
MESSIAEN, AM ;
WEYNANTS, RR .
NUCLEAR FUSION, 1982, 22 (02) :280-288
[2]   RAY-TRACING MODELING OF THE ICRF HEATING OF LARGE TOKAMAKS [J].
BHATNAGAR, VP ;
KOCH, R ;
GEILFUS, P ;
KIRKPATRICK, R ;
WEYNANTS, RR .
NUCLEAR FUSION, 1984, 24 (08) :955-976
[3]  
BHATNAGAR VP, 1990, THEORY FUSION PLASMA, P243
[4]  
BHATNAGAR VP, 1994, NET103 EURFUXII16394
[5]  
BHATNAGAR VP, 1987, JETJDNJ874 TECH NOT
[6]  
BHATNAGAR VP, 1993, CONTROLLED FUSION C, V17, P937
[7]  
BOSIA G, 1991, FAST WAVE CURRENT DR, P471
[8]  
BRAITHWATE G, 1989, REV SCI INSTRUM, V60, P2835
[9]  
BRAMBILLA M, 1983, IPP4210 MAX PLANCK I
[10]   STABILIZATION OF SAWTEETH WITH ADDITIONAL HEATING IN THE JET TOKAMAK [J].
CAMPBELL, DJ ;
START, DFH ;
WESSON, JA ;
BARTLETT, DV ;
BHATNAGAR, VP ;
BURES, M ;
CORDEY, JG ;
COTTRELL, GA ;
DUPPEREX, PA ;
EDWARDS, AW ;
CHALLIS, CD ;
GORMEZANO, C ;
GOWERS, CW ;
GRANETZ, RS ;
HAMNEN, JH ;
HELLSTEN, T ;
JACQUINOT, J ;
LAZZARO, E ;
LOMAS, PJ ;
CARDOZO, NL ;
MANTICA, P ;
SNIPES, JA ;
STORK, D ;
STOTT, PE ;
THOMAS, PR ;
THOMPSON, E ;
THOMSEN, K ;
TONETTI, G .
PHYSICAL REVIEW LETTERS, 1988, 60 (21) :2148-2151