THE SPACE POTENTIAL IN THE TOKAMAK TEXT

被引：74

作者：

YANG, XZ ^{[1
]}

ZHANG, BZ ^{[1
]}

WOOTTON, AJ ^{[1
]}

SCHOCH, PM ^{[1
]}

RICHARDS, B ^{[1
]}

BALDWIN, D ^{[1
]}

BROWER, DL ^{[1
]}

CASTLE, GG ^{[1
]}

HAZELTINE, RD ^{[1
]}

HEARD, JW ^{[1
]}

HICKOK, RL ^{[1
]}

LI, WL ^{[1
]}

LIN, H ^{[1
]}

MCCOOL, SC ^{[1
]}

SIMCIC, VJ ^{[1
]}

RITZ, LP ^{[1
]}

YU, CX ^{[1
]}

机构：

[1] UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712

来源：

PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1991年 / 3卷 / 12期

关键词：

D O I：

10.1063/1.859774

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：

A heavy ion beam probe has been used to measure the plasma space potential profiles in the tokamak TEXT [Nucl. Fusion Technol. 1, 479 (1981)]. The Ohmic discharges studied were perturbed by externally produced resonant magnetic fields (an ergodic magnetic limiter or EML). Without these perturbations the plasma central potential is generally consistent with the value calculated from radial ion momentum balance, using experimental values of density and ion temperature and assuming a neoclassical poloidal rotation velocity. Exceptions to the agreement are found when operating with reduced plasma parameters. Possible reasons for this discrepancy are explored, in particular, the effects of intrinsic magnetic field fluctuations, and modifications to the self-consistent radial electric sheath. With the application of the EML fields the edge electric field and potential increase during periods of magnetic island overlap. A test particle calculation of electron transport shows increases in diffusivity also occur during periods of magnetic island overlap. These calculated changes in diffusivity are interpreted in terms of a stochastic layer width, which is itself used to predict a potential change for comparison with the experimental results.

引用

页码：3448 / 3461

页数：14

共 31 条

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