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Author Tenney, F. H. ♦ Hill, K. W. ♦ von Goeler, S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ FIRST WALL ♦ FLUORESCENCE ♦ REFLECTIVITY ♦ X-RAY SPECTRA ♦ PDX DEVICES ♦ PLASMA DIAGNOSTICS ♦ MULTI-CHANNEL ANALYZERS ♦ BEAM INJECTION HEATING ♦ EFFICIENCY ♦ ELECTRON TEMPERATURE ♦ EXPERIMENTAL DATA ♦ IMPURITIES ♦ NEUTRAL ATOM BEAM INJECTION ♦ SCATTERING ♦ SOFT X RADIATION ♦ BEAM INJECTION ♦ CLOSED PLASMA DEVICES ♦ DATA ♦ ELECTROMAGNETIC RADIATION ♦ ELECTRONIC EQUIPMENT ♦ EQUIPMENT ♦ HEATING ♦ INFORMATION ♦ IONIZING RADIATIONS ♦ LUMINESCENCE ♦ NUMERICAL DATA ♦ OPTICAL PROPERTIES ♦ PHYSICAL PROPERTIES ♦ PLASMA HEATING ♦ PULSE ANALYZERS ♦ RADIATIONS ♦ SPECTRA ♦ SURFACE PROPERTIES ♦ THERMONUCLEAR DEVICES ♦ THERMONUCLEAR REACTOR WALLS ♦ TOKAMAK DEVICES ♦ X RADIATION ♦ Fusion Power Plant Technology- Blanket Engineering
Abstract A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8--20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. The 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 very much increased during the neutral beam heating, with an enhancement factor of at least 10 over the OH wall radiation. Since we measure the plasma and the wall radiation at the same time, the 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, for example, charge particle bombardment of the wall.
Educational Use Research
Learning Resource Type Article
Publisher Date 1985-05-01
Publisher Place United States
Journal Rev. Sci. Instrum.
Volume Number 56
Issue Number 5
Organization Princeton University, Plasma Physics Laboratory, Princeton, New Jersey 08544


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