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Title: Results from the NSTX X-ray Crystal Spectrometer

Abstract

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.more » 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.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
809961
Report Number(s):
PPPL-3766
TRN: US0302659
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 14 Jan 2003
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; CHARGE EXCHANGE; ELECTRON TEMPERATURE; ION TEMPERATURE; POSITION SENSITIVE DETECTORS; PROPORTIONAL COUNTERS; SPECTROMETERS; SPECTROSCOPY; THOMSON SCATTERING; TIME RESOLUTION; DIAGNOSTICS; ION HEATING; X-RAY SPECTROSCOPY

Citation Formats

Bitter, M, Hill, K, Roquemore, L, Beiersdorfer, P, Thorn, D, and Gu, Ming Feng. Results from the NSTX X-ray Crystal Spectrometer. United States: N. p., 2003. Web. doi:10.2172/809961.
Bitter, M, Hill, K, Roquemore, L, Beiersdorfer, P, Thorn, D, & Gu, Ming Feng. Results from the NSTX X-ray Crystal Spectrometer. United States. https://doi.org/10.2172/809961
Bitter, M, Hill, K, Roquemore, L, Beiersdorfer, P, Thorn, D, and Gu, Ming Feng. 2003. "Results from the NSTX X-ray Crystal Spectrometer". United States. https://doi.org/10.2172/809961. https://www.osti.gov/servlets/purl/809961.
@article{osti_809961,
title = {Results from the NSTX X-ray Crystal Spectrometer},
author = {Bitter, M and Hill, K and Roquemore, L and Beiersdorfer, P and Thorn, D and Gu, Ming Feng},
abstractNote = {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.},
doi = {10.2172/809961},
url = {https://www.osti.gov/biblio/809961}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 14 00:00:00 EST 2003},
month = {Tue Jan 14 00:00:00 EST 2003}
}