Measurement of wall radiation in the soft x-ray region of PDX
A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8 to 20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. This setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is increased very much during the neutral beam heating with an enhancement factor of at least 10 over OH wall radiation. Since we measure the plasma and the wall radiation at the same time, these measurements allow the conclusion that the wall radiation can be attributed essentially to fluorescence (line radiation, e.g., Ti-K/sub ..cap alpha../) and scattering (continuum part of the wall radiation spectrum). The fluorescence and the scattering are both caused by soft x-ray radiation flux coming from the plasma. There seems to be no need to invoke other, more exotic causes for the wall radiation (like charge particle bombardment of the wall).
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6040959
- Report Number(s):
- PPPL-2188; ON: DE85007135
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FIRST WALL
X-RAY SPECTRA
PDX DEVICES
FLUORESCENCE
LI-DRIFTED SI DETECTORS
RADIATIONS
SCATTERING
CLOSED PLASMA DEVICES
LI-DRIFTED DETECTORS
LUMINESCENCE
MEASURING INSTRUMENTS
RADIATION DETECTORS
SEMICONDUCTOR DETECTORS
SI SEMICONDUCTOR DETECTORS
SPECTRA
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
TOKAMAK DEVICES
700104* - Fusion Energy- Plasma Research- Plasma Kinetics-Experimental- (-1987)