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Title: X-ray and Extreme Ultraviolet Spectroscopy on DIII-D

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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1748--0221
DOE Contract Number:
Resource Type:
Resource Relation:
Journal Volume: 12; Journal Issue: 06; Conference: Presented at: European Conference on Plasma Diagnostics, Bordeaux, France, Apr 18 - Apr 21, 2017
Country of Publication:
United States

Citation Formats

Victor, B S, Allen, S L, Beiersdorfer, P, and Magee, E W. X-ray and Extreme Ultraviolet Spectroscopy on DIII-D. United States: N. p., 2017. Web. doi:10.1088/1748-0221/12/06/C06011.
Victor, B S, Allen, S L, Beiersdorfer, P, & Magee, E W. X-ray and Extreme Ultraviolet Spectroscopy on DIII-D. United States. doi:10.1088/1748-0221/12/06/C06011.
Victor, B S, Allen, S L, Beiersdorfer, P, and Magee, E W. Wed . "X-ray and Extreme Ultraviolet Spectroscopy on DIII-D". United States. doi:10.1088/1748-0221/12/06/C06011.
title = {X-ray and Extreme Ultraviolet Spectroscopy on DIII-D},
author = {Victor, B S and Allen, S L and Beiersdorfer, P and Magee, E W},
abstractNote = {},
doi = {10.1088/1748-0221/12/06/C06011},
journal = {},
number = 06,
volume = 12,
place = {United States},
year = {Wed May 17 00:00:00 EDT 2017},
month = {Wed May 17 00:00:00 EDT 2017}

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  • Two spectrometers were installed to measure tungsten emission in the core of DIII-D plasmas during a metal rings experimental campaign. The spectral range of the high-resolution (1340 spectral channels), variable-ruled grating X-ray and Extreme Ultraviolet Spectrometer (XEUS) extends from10–71more » $$\dot{A}$$ . The spectral range of the second spectrometer, the Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS), measures between 31–174$$\dot{A}$$ . Three groups of tungsten lines were identified with XEUS: W 38+-W 45+ from 47–63$$\dot{A}$$ , W 27+-W 35+ from 45–55$$\dot{A}$$ , and W 28+-W 33+ from 16–30$$\dot{A}$$ . Emission lines from tungsten charge states W 28+, W 43+, W 44+, and W 45+ are identified and the line amplitude is presented versus time. Peak emission of W 43+-W 45+ occurs between core Te=2.5-3 keV, and peak emission of W28+ occurs at core Te 1:3 keV. One group of tungsten lines, W 40+-W 45+, between 120–140$$\dot{A}$$ , was identified with LoWEUS. W 43+- W 45+ lines measured with LoWEUS track the sawtooth cycle. Furthermore, sensitivity to the sawtooth cycle and the correlation of the peak emission with core electron temperature show that these spectrometers track the on-axis tungsten emission of DIII-D plasmas.« less
  • We have performed an absolute intensity calibration of a SPRED multichannel EUV spectrograph using synchrotron radiation from the NBS SURF-II electron storage ring. The calibration procedure and results for both a survey grating (450 g/mm) and a high-resolution (2100 g/mm) grating are presented. The spectrograph is currently in use on the DIII-D tokamak with a tangential line-of-sight at the plasma midplane. Data is first acquired and processed by a microcomputer; the absolute line intensities are then sent to the DIII-D database for comparison with data from other diagnostics. Representative data from DIII-D plasma operations will be presented. 6 refs., 3more » figs., 1 tab.« less
  • We report the construction of a facility for investigating x-ray pumping of extreme ultraviolet lasers. Measurements of large excited populations in Li/sup +/ and an investigation of a Li/sup +/ ''shake-up'' laser are described.
  • Laser based techniques for extreme ultraviolet and x-ray spectroscopy fall into two categories: production of coherent light by direct lasing or nonlinear optical mixing, and generation of incoherent light using laser-induced plasmas. 4 references, 3 figures.