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

被引：48

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

页码：1271 / 1280

页数：10

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