Simulation of the motional Stark effect diagnostic gas-filled torus calibration

被引：8
|
作者：
Yuh, Howard Y. [1 ]
Levinton, F. M. [1 ]
Scott, S. D. [2 ]
Ko, J. [3 ]
机构：
[1] Nova Photon Inc, Princeton, NJ 08540 USA
[2] Princeton Plasma Phys Lab, Princeton, NJ 08540 USA
[3] MIT PSFC, Cambridge, MA 02139 USA
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2008年 / 79卷 / 10期
关键词：
magnetic reconnection; plasma beam injection heating; plasma diagnostics; plasma simulation; Stark effect; Tokamak devices;
D O I：
10.1063/1.2969419
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Many motional Stark effect diagnostics around the world make use of a calibration procedure in which the observed neutral beam is injected into a gas-filled torus with known vacuum fields. The instrument is calibrated by reconciling measured angles with vacuum magnetic reconstructions through a range of pitch angles. This in situ gas-filled torus calibration most closely approximates the working conditions of the diagnostic and includes effects such as beam and viewing geometries, beam voltages, Faraday and stress induced birefringence (in most cases) of the transmissive optics, as well as the polarimeter response. However, secondary neutrals, produced after ionization then reneutralization of a beam neutral, have been found to contaminate measured angles by emitting Balmer alpha with similar Doppler shifts and Stark polarizations as beam neutrals, but with different polarization angles. Simulation results that show spectral and angle behavior versus calibration parameters such as fill gas pressure will be presented. Data from NSTX and C-Mod will be compared to simulations results.
引用
收藏
页数：4
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