AN OPTIMIZATION OF BETA IN THE DIII-D TOKAMAK

被引:82
作者
LAZARUS, EA
LAO, LL
OSBORNE, TH
TAYLOR, TS
TURNBULL, AD
CHU, MS
KELLMAN, AG
STRAIT, EJ
FERRON, JR
GROEBNER, RJ
HEIDBRINK, WW
CARLSTROM, T
HELTON, FJ
HSIEH, CL
LIPPMANN, S
SCHISSEL, D
SNIDER, R
WROBLEWSKI, D
机构
[1] UNIV CALIF IRVINE,IRVINE,CA 92717
[2] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831
[3] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550
来源
PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1992年 / 4卷 / 11期
关键词
D O I
10.1063/1.860373
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
Accurate equilibrium reconstruction and detailed stability analysis of a strongly shaped, double-null, beta(T) = 11% discharge shows that the plasma core is in the second stable regime to ideal ballooning modes. The equilibrium reconstruction using all the available data (coil currents, poloidal magnetic loops, motional Stark effect data, the kinetic pressure profile, the magnetic axis location, and the location of the two q = 1 surfaces) shows a region of negative magnetic shear near the magnetic axis, an outer positive shear region, and a low shear region connecting the two. The inner negative shear region allows a large positive shear region near the boundary, even at low q (q95 = 2.6), permitting a large outer region pressure gradient to be first regime stable. The inner region is in the second stable regime, consistent with the observed axial beta [beta(T)(0) = 44%]. In the low shear region p' vanishes, consistent with Mercier stability. This is one way to extend the ballooning limit in shaped plasmas while maintaining stability against external kinks. The n = 1 analysis shows that the plasma is unstable to an ideal internal mode, consistent with the experimental observations of a saturated internal m/n = 1/1 mode. The core plasma pressure, not being limited by ballooning stability, appears to be reaching a local equilibrium limit at the magnetic axis.
引用
收藏
页码:3644 / 3662
页数:19
相关论文
共 45 条
[1]  
[Anonymous], 1975, FIZ PLAZMY
[2]   TOKAMAK DEVICES [J].
ARTSIMOVICH, LA .
NUCLEAR FUSION, 1972, 12 (02) :215-+
[3]   GATO - AN MHD STABILITY CODE FOR AXISYMMETRIC PLASMAS WITH INTERNAL SEPARATRICES [J].
BERNARD, LC ;
HELTON, FJ ;
MOORE, RW .
COMPUTER PHYSICS COMMUNICATIONS, 1981, 24 (3-4) :377-380
[4]   ISODYNAMICAL (OMNIGENOUS) EQUILIBRIUM IN SYMMETRICALLY CONFINED PLASMA CONFIGURATIONS [J].
BERNARDIN, MP ;
MOSES, RW ;
TATARONIS, JA .
PHYSICS OF FLUIDS, 1986, 29 (08) :2605-2611
[5]  
BURRELL KH, 1991, PLASMA PHYS CONTROLL, V1, P123
[6]  
CAMPBELL DJ, 1989, PLASMA PHYS CONTROLL, V1, P377
[7]   TEARING-MODE ACTIVITY FOR HOLLOW CURRENT PROFILES [J].
CARRERAS, B ;
HICKS, HR ;
WADDELL, BV .
NUCLEAR FUSION, 1979, 19 (05) :583-596
[8]  
CHANCE MS, 1988, 1987 P THEOR FUS PLA, V18, P87
[9]  
DUNLAP JL, 1982, PHYS REV LETT, V48, P539
[10]  
EFTHIMION PC, 1989, PLASMA PHYSICS CONTR