Impurity transport studies in NSTX neutral beam heated H-mode plasmas

被引：23

作者：

Delgado-Aparicio, L. ^{[1
]}

Stutman, D. ^{[1
]}

Tritz, K. ^{[1
]}

Finkenthal, M. ^{[1
]}

Kaye, S. ^{[2
]}

Bell, R. ^{[2
]}

Kaita, R. ^{[2
]}

LeBlanc, B. ^{[2
]}

Levinton, F. ^{[3
]}

Menard, J. ^{[2
]}

Paul, S. ^{[2
]}

Smith, D. ^{[2
]}

Yuh, H. ^{[3
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[3] NOVA Photon Inc, Princeton, NJ 08543 USA

来源：

NUCLEAR FUSION | 2009年 / 49卷 / 08期

关键词：

X-RAY ARRAYS; INVERSION TECHNIQUE; TOKAMAKS; DIAGNOSTICS; DISCHARGES; PROFILE; PHYSICS;

D O I：

10.1088/0029-5515/49/8/085028

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 first experimental assessment of low-Z impurity transport in a neutral beam heated, high-confinement H-mode plasma sustained in a low-field, low-aspect ratio spherical tokamak, was performed at the National Spherical Torus Experiment (NSTX). The injected impurities penetrate to the core on a hundred millisecond time scale, indicating a low core particle diffusivity (less than or similar to 1 m(2) s(-1)) in good agreement with the values predicted by neoclassical transport theory. In addition, a fixed q-profile magnetic field scan that showed reduced impurity penetration at high fields is also reported. This result suggests that anomalous ion particle transport associated with turbulent long-wavelength electrostatic instabilities must be largely suppressed in the NSTX core.

引用

页数：10

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