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Abstract

A visible endoscope system and an infrared camera system have been used to study the flux of carbon from an inertially-cooled graphite limiter in Tore Supra. From the variation in the carbon flux with plasma parameters new data have been obtained describing the dependence of radiation enhanced sublimation (RES) and chemical sputtering on incident ion flux. Other characteristics of RES under plasma operation conditions have also been studied. The dependence of RES on incident deuterium particle flux density is found to be in reasonable agreement with the expected particle flux scaling over a range of particle fluxes varying by a factor of about 25, extending the present scaling to higher flux density values. Chemical sputtering has been observed, but only in regions of the limiter with low incident deuterium fluxes. Values inferred for the chemical sputtering yield are similar to those measured with a temperature-controlled test limiter in Textor.

Additional information

Authors: TOBIN S J, Oak Ridge National Laboratory, Fusion Energy Division (US);HOGAN J T, Oak Ridge National Laboratory, Fusion Energy Division (US);KLEPPER C C, Oak Ridge National Laboratory, Fusion Energy Division (US);DEMICHELIS C, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);MONIER-GARBET P, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);GUILHEM D, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1621 EN (1998) 27pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
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