Observations of enhanced core confinement in negative magnetic shear discharges with an L mode edge on DIII-D

被引：47
|
作者：
Rice, BW [1 ]
Lazarus, EA [1 ]
Austin, ME [1 ]
Burrell, KH [1 ]
Casper, TA [1 ]
Groebner, RJ [1 ]
Gohil, P [1 ]
Forest, CB [1 ]
Ikezi, H [1 ]
Lao, LL [1 ]
Mauel, ME [1 ]
Navratil, GA [1 ]
Stallard, BW [1 ]
Strait, EJ [1 ]
Taylor, TS [1 ]
机构：
[1] GEN ATOM CO,SAN DIEGO,CA
来源：
NUCLEAR FUSION | 1996年 / 36卷 / 10期
关键词：
D O I：
10.1088/0029-5515/36/10/I12
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：
Plasma discharges with negative central magnetic shear (NCS) and access to the ballooning second stability regime have been produced on DIII-D with edge plasma conditions similar to those in the standard L mode confinement regime. Confinement enhancement factors up to H drop tau(E)/tau(ITER-89P) similar to 2.5 are obtained while maintaining the L mode edge. Compared with discharges with monotonic q profiles, highly peaked toroidal rotation (f(phi)(0) approximate to 30-70 kHz), ion temperature (T-i(0) approximate to 15-22 keV) and density (n(e)(0)/(n) over tilde(e) approximate to 2.2) profiles are observed. This regime has yielded the highest DD neutron rates observed to date on DIII-D. Steep pressure gradients drive a large bootstrap current, with up to similar to 75% total non-inductive current drive. These features make this an attractive advanced tokamak operating regime for further study.
引用
收藏
页码：1271 / 1280
页数：10
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