X-ray observations of medium Z H- and He-like ions with satellites from C-Mod tokamak plasmas
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X-ray observations.pdf
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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.
Date Issued
May 2015
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/0953-4075/48/14/144013
