Measurements of fast-ion acceleration at cyclotron harmonics using Balmer-alpha spectroscopy

被引：119

作者：

Heidbrink, W. W. ^{[1
]}

Luo, Y.

Burrell, K. H.

Harvey, R. W.

Pinsker, R. I.

Ruskov, E.

机构：

[1] Univ Calif Irvine, Irvine, CA 92623 USA

[2] Gen Atom Co, San Diego, CA USA

[3] CompX, Del Mar, CA USA

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2007年 / 49卷 / 09期

关键词：

D O I：

10.1088/0741-3335/49/9/008

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：

Combined neutral beam injection and fast wave heating at the fourth and fifth cyclotron harmonics accelerate fast ions in the DIII-D tokamak. Measurements with a nine-channel fast-ion D-alpha (FIDA) diagnostic indicate the formation of a fast-ion tail above the injection energy. Tail formation correlates with enhancement of the d-d neutron rate above the value that is expected in the absence of fast-wave acceleration. FIDA spatial profiles and fast-ion pressure profiles inferred from the equilibrium both indicate that the acceleration is near the magnetic axis for a centrally located resonance layer. The enhancement is largest 8-10 cm beyond the radius where the wave frequency equals the cyclotron harmonic, probably due to a combination of Doppler-shift and orbital effects. The fast-ion distribution function calculated by the CQL3D Fokker-Planck code is fairly consistent with the data.

引用

页码：1457 / 1475

页数：19

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