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Abstract

The comprehension and control of plasma-wall interactions are key issues in thermonuclear fusion research because of their influence on the fuelling and plasma purity. The backscattering and molecular recombination at the front surface constitute the so-called recycling, which is particle re-emission to the plasma. A plasma simulator has been developed at the Fusion Materials Studies sector (FMSS) of the Joint Research Centre (JRC) Ispra to study hydrogen recycling from firs wall materials with International Tokamak Experimental Reactor (ITER) like boundary conditions; a new, improved and tritium compatible facility is now ready to operate. Results on first wall (FW) structural materials show that the recycling of hydrogen isotopes is a fast process and that a significant amount of the impinging particles is released back into the vacuum chamber. From these recycling measurements the evaluation of the reflection coefficient and of the surface recombination rate constant of materials for light ions at high fluxes and low impinging energy can be obtained.

Additional information

Authors: TOMINETTI S, JRC Ispra (IT);CAMPOSILVAN J, JRC Ispra (IT);ADOLFO P, JRC Ispra (IT)
Bibliographic Reference: Paper presented: XIII Congresso Nazionale Sulle Scienza e Tecnologia del Vuoto, Milano (IT), February 14-16, 1996
Availability: Available from (1) as Paper EN 39642 ORA
Record Number: 199610617 / Last updated on: 1996-05-27
Category: PUBLICATION
Original language: en
Available languages: en
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