A Code that Simulates Fast-Ion Dα and Neutral Particle Measurements

被引:123
作者
Heidbrink, W. W. [1 ]
Liu, D. [1 ,3 ]
Luo, Y. [1 ,4 ]
Ruskov, E. [1 ]
Geiger, B. [2 ]
机构
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[3] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[4] Tri Alpha Energy Corp, Foothill Ranch, CA 92610 USA
关键词
Fast ions; RECONSTRUCTION; EXCITATION;
D O I
10.4208/cicp.190810.080211a
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A code that models signals produced by charge-exchange reactions between fast ions and injected neutral beams in tokamak plasmas is described. With the fast-ion distribution function as input, the code predicts the efflux to a neutral particle analyzer (NPA) diagnostic and the photon radiance of Balmer-alpha light to a fastion D-alpha (FIDA) diagnostic. Reactions with both the primary injected neutrals and with the cloud of secondary "halo" neutrals that surround the beam are treated. Accurate calculation of the fraction of neutrals that occupy excited atomic states (the collisional-radiative transition equations) is an important element of the code. Comparison with TRANSP output and other tests verify the solutions. Judicious selection of grid size and other parameters facilitate efficient solutions. The output of the code has been validated by FIDA measurements on DIII-D but further tests are warranted.
引用
收藏
页码:716 / 741
页数:26
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