Rotational and magnetic shear stabilization of magnetohydrodynamic modes and turbulence in DIII-D high performance discharges

被引:131
作者
Lao, LL
Burrell, KH
Casper, TS
Chan, VS
Chu, MS
DeBoo, JC
Doyle, EJ
Durst, RD
Forest, CB
Greenfield, CM
Groebner, RJ
Hinton, FL
Kawano, Y
Lazarus, EA
LinLiu, YR
Mauel, ME
Meyer, WH
Miller, RL
Navratil, GA
Osborne, TH
Peng, Q
Rettig, CL
Rewoldt, G
Rhodes, TL
Rice, BW
Schissel, DP
Stallard, BW
Strait, EJ
Tang, WM
Taylor, TS
Turnbull, AD
Waltz, RE
机构
[1] LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA
[2] UNIV WISCONSIN, MADISON, WI 53706 USA
[3] UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA
[4] JAPAN ATOM ENERGY RES INST, IBARAKI, OSAKA, JAPAN
[5] OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA
[6] COLUMBIA UNIV, NEW YORK, NY 10027 USA
[7] PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08543 USA
关键词
D O I
10.1063/1.871991
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
The confinement and the stability properties of the DIII-D tokamak [Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159] high-performance discharges are evaluated in terms of rotational and magnetic shear, with an emphasis on the recent experimental results obtained from the negative central magnetic shear (NCS) experiments. In NCS discharges, a core transport barrier is often observed to form inside the NCS region accompanied by a reduction in core fluctuation amplitudes. Increasing negative magnetic shear contributes to the formation of this core transport barrier, but by itself is not sufficient to fully stabilize the toroidal drift mode (trapped-electron-eta(i) mode) to explain this formation. Comparison of the Doppler shift shear rate to the growth rate of the eta(i) mode suggests that the large core E X B flow shear can stabilize this mode and broaden the region of reduced core transport. Ideal and resistive stability analysis indicates the performance of NCS discharges with strongly peaked pressure profiles is limited by the resistive interchange mode to low beta(N) less than or equal to 2.3. This mode is insensitive to the details of the rotational and the magnetic shear profiles. A new class of discharges, which has a broad region of weak or slightly negative magnetic shear (WNS), is described. The WNS discharges have broader pressure profiles and higher beta values than the NCS discharges, together with high confinement and high fusion reactivity. (C) 1996 American Institute of Physics.
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收藏
页码:1951 / 1958
页数:8
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