Tokamak fusion test reactor prototype x-ray pulse-height analyzer diagnostic
The x-ray pulse-height analysis (PHA) diagnostic uses a liquid-nitrogen cooled array of 5 Si(Li) and one HpGe detectors to do time-resolved (5--100 ms) x-ray spectroscopy of the central horizontal chord of the Tokamak Fusion Test Reactor (TFTR) plasmas in the 1--50-keV range. Central electron temperature T/sub e/ and concentration of medium and low-Z impurities are derived from the spectra. Remotely selectable absorber-foil arrays provide selection of the energy range. Fixed and movable aperture arrays allow approximate equalization of count rates in different energy bands and extend dynamic range. Amplifier pulse shapes are approximately triangular. Main amplifier peaking time is 4 ..mu..s yielding 230-eV FWHM at 5.9 keV. Pileup inspection times are selectable at 0.13, 0.4, or 0.9 ..mu..s. Throughput is up to 42 kHz. The PHA has been used to study temperature and impurities over a wide range of TFTR operational parameters. Dramatic variations in metal impurities with density, plasma current, and major radius have been observed.
- Research Organization:
- Princeton University, Plasma Physics Laboratory, Princeton, New Jersey 08544
- OSTI ID:
- 5594563
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 56:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLASMA DIAGNOSTICS
PULSE ANALYZERS
X-RAY SPECTROSCOPY
TFTR TOKAMAK
ELECTRON TEMPERATURE
IMPURITIES
AMPLIFIERS
EXPERIMENTAL DATA
PHOTODETECTORS
PULSE TECHNIQUES
SIZE
SPATIAL RESOLUTION
TIME RESOLUTION
X-RAY SPECTRA
DATA
ELECTRONIC EQUIPMENT
EQUIPMENT
INFORMATION
NUMERICAL DATA
RESOLUTION
SPECTRA
SPECTROSCOPY
THERMONUCLEAR REACTORS
TIMING PROPERTIES
TOKAMAK TYPE REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics