Observation of D2 molecule line emission after massive D2 injection into runaway electron plateaus in DIII-D

被引：2
|
作者：
Hollmann, E. M. [1 ]
Herfindal, J. L. [2 ]
Mclean, A. [3 ]
Pigarov, A. Yu. [4 ]
Shiraki, D. [2 ]
Wilcox, R. S. [2 ]
机构：
[1] Univ Calif San Diego, 9500 Gilman Dr, La Jolla, CA 92093 USA
[2] Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA
[3] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA
[4] CompX Corp, POB 2672, Del Mar, CA 92014 USA
来源：
PHYSICS OF PLASMAS | 2023年 / 30卷 / 10期
关键词：
COLLISIONAL-RADIATIVE MODEL; CROSS-SECTIONS; HYDROGEN; PLASMA; DEUTERIUM; H-2; TEMPERATURES; POPULATION; IONIZATION; ATOMS;
D O I：
10.1063/5.0162644
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：
Molecular deuterium line emission is observed in both the visible and ultraviolet (UV) wavelength ranges after massive (> 100 Torr-L) injection of D-2 gas into post-disruption runaway electron (RE) dominated plasmas in the DIII-D tokamak. D-2 UV line emission is found to be the dominant source of radiated power, surpassing D Ly alpha. Interpretive modeling with a collisional-radiative model (CRM) indicates that D-2 radiation surpasses D radiation because Ly alpha is strongly trapped, while D-2 UV lines are mostly untrapped. The CRM also indicates that the D-2 line emission is completely dominated by RE impact (rather than thermal electron impact), so the D-2 line emission can serve as a good diagnostic for the spatial localization of REs. Analysis of D-2 visible lines indicates that the D-2 molecules in the plasma are thermally equilibrated with the background plasma, with vibrational, rotational, and kinetic temperatures all near 0.3 eV. D-2 spectroscopy therefore serves as a convenient diagnostic of background plasma temperature. Measurement of D-2 radiated power also appears to serve as a useful diagnostic for constraining neutral transport modeling.
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页数：13
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