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Abstract

Radiation-enhanced sublimitation (RES) consists of the irradiation-induced emission of predominantly single carbon atoms with thermal energies. The main features of this effect can be reasonably well explained with an interstitial model in which RES is due to the desorption of radiation produced by interstitials. investigations with different graphite doping shave so far yielded only slightly reduced RES emission in a limited temperature range. In contrast, carbides show little or no RES emission.

It is suspected that RES limits the maximum working temperature of carbon-based materials as plasma-facing components below about 1500 K. However, current observations of RES emission from highly exposed limiters and divertor tiles in fusion devices have shown no indication of significant RES emission. This behaviour is believed to be due to a decrease of the RES emission with increasing flux density so that RES becomes negligible compared to physical sputtering under the high flux densities impinging on limiters and divertor tiles. .

Additional information

Authors: ECKSTEIN W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);PHILIPPS V, Forschungszentrum Jülich (DE)
Bibliographic Reference: Article: Physical Processes of the Interaction of Fusion Plasmas with Solids (1996) pp. 93-133
Record Number: 199610492 / Last updated on: 1996-05-20
Category: PUBLICATION
Original language: en
Available languages: en