Correlation between plasma temperature and impurity flux in the limiter shadow of the Textor tokamak
- 1 August 1988
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. 38 (2) , 150-154
- https://doi.org/10.1088/0031-8949/38/2/005
Abstract
This paper presents a method of utilizing collector probe techniques to determine quantitatively parameters controlling the impurity production in fusion devices. Thus, a particle collection probe system was used to investigate the effects of a variation in the plasma core temperature on the flux of heavy impurities in the limiter shadow of the Textor tokamak. Time resolved impurity flux measurements were carried out in five hydrogen plasma discharges. The electron temperature at the plasma center was varied in the interval 0.66-0.95 keV during the flat top part of these discharges. The results of the measurements show that this temperature increase was accompanied by a factor 2-5 increase in the heavy impurity flux. A comparison with existing sputtering yield data was carried out. It showed that the results could be explained in terms of sputtering of the limiters by hydrogen ions, the energy of these ions and the corresponding sputtering yield were derived.Keywords
This publication has 18 references indexed in Scilit:
- Influence of the pump limtter ALT-I on the heavy impurity fluxes in the scrape-off layer of textorJournal of Nuclear Materials, 1987
- A computer-controlled particle collection and surface analysis system for tokamak scrape-of-layer analysisNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1985
- Impurity Flux Studies in the Limiter Shadow of the TEXTOR TokamakPhysica Scripta, 1985
- Wall conditioning of TEXTORJournal of Nuclear Materials, 1984
- Probe measurements of impurities in the scrape-off layer of TEXTORJournal of Nuclear Materials, 1984
- Impurities in tokamaksNuclear Fusion, 1984
- TEXTOR: Research programme on plasma wall interactionJournal of Nuclear Materials, 1984
- Probe measurements in the plasma boundary layerJournal of Nuclear Materials, 1982
- Plasma-surface interactions in tokamaksNuclear Fusion, 1979
- Tokamak plasma diagnosis by surface physics techniquesJournal of Nuclear Materials, 1978