High-resolution bent-crystal spectrometer for the ultra-soft x-ray region
A 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. 43 refs., 23 figs.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6638009
- Report Number(s):
- PPPL-2561; ON: DE89004622
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-resolution studies of the x-ray transitions in highly charged neon-like ions on the PLT tokamak
High-resolution n-italic = 3 to n-italic = 2 spectra of neonlike silver
Related Subjects
TOKAMAK DEVICES
PLASMA DIAGNOSTICS
X-RAY SPECTROMETERS
OPERATION
ENERGY RESOLUTION
IMPURITIES
SPATIAL RESOLUTION
TESTING
TIME RESOLUTION
CLOSED PLASMA DEVICES
MEASURING INSTRUMENTS
RESOLUTION
SPECTROMETERS
THERMONUCLEAR DEVICES
TIMING PROPERTIES
700102* - Fusion Energy- Plasma Research- Diagnostics