2041 K
52 pp.
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TitleHigh-resolution Bent-crystal Spectrometer for the Ultra-soft X-ray Region
Author(s)Beiersdorfer, P.; von Goeler, S.; Bitter, M.; Hill, K. W.; Hulse, R. A.; Walling, R. S.
Publication DateOctober 1988
Report NumberPPPL-2561
Unique IdentifierACC0139
Other NumbersLegacy ID: DE89004622; OSTI ID: 6638009
Research OrgPrinceton Univ., NJ (USA). Princeton Plasma Physics Laboratory (PPPL)
Contract NoAC02-76CH03073
Sponsoring OrgU.S. Department of Energy (USDOE)
Subject700102 -- Fusion Energy -- Plasma Research -- Diagnostics; Tokamak Devices -- Plasma Diagnostics; X-ray Spectrometers -- Operation; Energy Resolution; Impurities; Spatial Resolution; Testing; Time Resolution
KeywordsClosed Plasma Devices; Measuring Instruments; Resolution; Spectrometers; Thermonuclear Devices; Timing Properties
Related Web PagesRussell Hulse, the First Binary Pulsar, and Science Education
AbstractA multichannel vacuum Brag-crystal spectrometer has been developed for high-resolution measurements of the line emission from tokamak plasmas in the wavelength region between 4 and 25 angstrom. The spectrometer employs a bent crystal in Johann geometry and a microchannel-plate intensified photodiode array. The instrument is capable of measuring high-resolution spectra (lambda/..delta..lambda approx. 3000) with fast time resolution (4 msec per spectrum) and good spatial resolution (3 cm). The spectral bandwidth is ..delta..lambda/lambda{sub 0} = 8 angstrom. A simple tilt mechanism allows access to different wavelength intervals. In order to illustrate the utility of the new spectrometer, time- and space-resolved measurements of the n = 3 to n = 2 spectrum of selenium from the Princeton Large Torus tokamak plasmas are presented. The data are used to determine the plasma transport parameters and to infer the radial distribution of fluorinelike, neonlike, and sodiumlike ions of selenium in the plasma. The new ultra-soft x-ray spectrometer has thus enabled us to demonstrate the utility of high-resolution L-shell spectroscopy of neonlike ions as a fusion diagnostic.
2041 K
52 pp.
View Document 

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