Evaluation of thermal helium beam and line-ratio fast diagnostic on the National Spherical Torus Experiment-Upgrade

被引：16
|
作者：
Burgos, J. M. Munoz [1 ]
Agostini, M. [2 ]
Scarin, P. [2 ]
Stotler, D. P. [3 ]
Unterberg, E. A. [4 ]
Loch, S. D. [5 ]
Schmitz, O. [6 ]
Tritz, K. [1 ]
Stutman, D. [1 ]
机构：
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] Univ Padua, Ist Nazl Fis Nucl, Consorzio RFX, CNR,ENEA,Acciaierie Venete SpA, Corso Stati Uniti 4, I-35127 Padua, Italy
[3] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA
[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[5] Auburn Univ, Dept Phys, Auburn, AL 36849 USA
[6] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA
来源：
PHYSICS OF PLASMAS | 2016年 / 23卷 / 05期
关键词：
NEUTRAL HELIUM; EXCITATION;
D O I：
10.1063/1.4948554
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：
A 1-D kinetic collisional radiative model with state-of-the-art atomic data is developed and employed to simulate line emission to evaluate the Thermal Helium Beam (THB) diagnostic on NSTX-U. This diagnostic is currently in operation on RFX-mod, and it is proposed to be installed on NSTX-U. The THB system uses the intensity ratios of neutral helium lines 667.8, 706.5, and 728.1 nm to derive electron temperature (eV) and density (cm(-3)) profiles. The purpose of the present analysis is to evaluate the applications of this diagnostic for determining fast (similar to 4 mu s) electron temperature and density radial profiles on the scrape-off layer and edge regions of NSTX-U that are needed in turbulence studies. The diagnostic is limited by the level of detection of the 728.1 nm line, which is the weakest of the three. This study will also aid in future design of a similar 2-D diagnostic system on the divertor. Published by AIP Publishing.
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页数：12
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