Results from the NSTX X-ray Crystal Spectrometer

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A high-resolution X-ray crystal spectrometer has recently been installed at the National Spherical Torus Experiment to record the satellite spectra of helium-like argon, ArXVII, in the wavelength range from 3.94 to 4.00 {angstrom} for measurements of ion and electron temperatures, and measurements of the ionization equilibrium of argon, which is of interest for studies of ion transport. The instrument presently consists of a spherically bent quartz crystal and a conventional one-dimensional position-sensitive multi-wire proportional counter, but it will soon be upgraded to a new type of X-ray imaging crystal spectrometer by the installation of a large size (10 cm x ... continued below

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756 Kilobytes pages

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Bitter, M.; Hill, K.; Roquemore, L.; Beiersdorfer, P.; Thorn, D. & Gu, Ming Feng January 14, 2003.

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Description

A high-resolution X-ray crystal spectrometer has recently been installed at the National Spherical Torus Experiment to record the satellite spectra of helium-like argon, ArXVII, in the wavelength range from 3.94 to 4.00 {angstrom} for measurements of ion and electron temperatures, and measurements of the ionization equilibrium of argon, which is of interest for studies of ion transport. The instrument presently consists of a spherically bent quartz crystal and a conventional one-dimensional position-sensitive multi-wire proportional counter, but it will soon be upgraded to a new type of X-ray imaging crystal spectrometer by the installation of a large size (10 cm x 30 cm) two-dimensional position-sensitive detector that will allow us to obtain temporally and spatially resolved spectra from an 80 cm high cross-section of the plasma. In its present configuration, the spectrometer has been optimized for high throughput so that it is possible to record spectra with small statistical errors with a time resolution of 10 ms by adding only small, nonperturbing amounts of argon to the plasma. The spectrometer is most valuable for measurements of the ion temperature in the absence of a neutral beam in ohmically heated and radio-frequency heated discharges, when charge exchange recombination spectroscopy does not function. Electron temperature measurements from the satellite-to-resonance line ratios have been important for a quantitative comparison with (and verification of) the Thomson scattering data. The paper will describe the instrumental details of the present and future spectrometer configurations, and present recent experimental results.

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756 Kilobytes pages

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INIS; OSTI as DE00809961

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  • Other Information: PBD: 14 Jan 2003

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  • Report No.: PPPL-3766
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/809961 | External Link
  • Office of Scientific & Technical Information Report Number: 809961
  • Archival Resource Key: ark:/67531/metadc735919

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 14, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 18, 2016, 1:03 p.m.

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Bitter, M.; Hill, K.; Roquemore, L.; Beiersdorfer, P.; Thorn, D. & Gu, Ming Feng. Results from the NSTX X-ray Crystal Spectrometer, report, January 14, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc735919/: accessed January 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.