Predicting High Harmonic Ion Cyclotron Heating Efficiency in Tokamak Plasmas

被引：28

作者：

Green, D. L. ^{[1
]}

Berry, L. A. ^{[1
]}

Chen, G. ^{[1
]}

Ryan, P. M. ^{[1
]}

Canik, J. M. ^{[1
]}

Jaeger, E. F. ^{[2
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] XCEL Engn Inc, Oak Ridge, TN 37830 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 14期

关键词：

WAVES; NSTX;

D O I：

10.1103/PhysRevLett.107.145001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Observations of improved radio frequency (rf) heating efficiency in ITER relevant high-confinement (H-)mode plasmas on the National Spherical Tokamak Experiment are investigated by whole-device linear simulation. The steady-state rf electric field is calculated for various antenna spectra and the results examined for characteristics that correlate with observations of improved or reduced rf heating efficiency. We find that launching toroidal wave numbers that give fast-wave propagation in the scrape-off plasma excites large amplitude (similar to kV m(-1)) coaxial standing modes between the confined plasma density pedestal and conducting vessel wall. Qualitative comparison with measurements of the stored plasma energy suggests that these modes are a probable cause of degraded heating efficiency.

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页数：4

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