X-ray observations of medium Z H- and He-like ions with satellites from C-Mod tokamak plasmas
Author(s)
Reinke, M L; Ashbourn, J M A; Bitter, M; Delgado-Aparicio, L; Hill, K; Safronova, U I; Gao, Chi; Howard, Nathaniel Thomas; Hughes Jr, Jerry; Rice, John E.; ... Show more Show less
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X-ray spectra of H- and He-like ions (and satellites) from argon, calcium and chlorine have been measured in Alcator C-Mod tokamak plasmas using a high wavelength resolution imaging x-ray spectrometer system. For H-like charge states, the Lyα doublet intensity ratio is found to be slightly greater than 1/2 due to interaction with the [superscript 2]S[subscript 1/2] fine structure sub-level. Neighbouring satellites with spectator electrons occupying n = 2 through n = 7 have been modelled. The Lyα doublet ratio scalings with electron density and temperature are shown to be in good agreement with collisional–radiative modelling. For He-like ions, the n = 2 satellite intensities are in good agreement with calculations and can be used to determine the electron temperature. The high n Rydberg series has been resolved up to 1s[superscript 2]–1s14p, and satellites with spectator electrons up to the n = 12 level have been identified.
Date issued
2015-05Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Plasma Science and Fusion CenterJournal
Journal of Physics B: Atomic, Molecular and Optical Physics
Publisher
IOP Publishing
Citation
Rice, J E et al. “X-Ray Observations of Medium Z H- and He-Like Ions with Satellites from C-Mod Tokamak Plasmas.” Journal of Physics B: Atomic, Molecular and Optical Physics 48, 14 (May 2015): 144013 © 2015 IOP Publishing
Version: Author's final manuscript
ISSN
0953-4075
1361-6455