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Abstract

THE CHEMICAL EROSION BEHAVIOUR OF GRAPHITE MATERIALS PRE-EXPOSED IN TOKAMAK FUSION TEST REACTOR (TFTR) AS THE BUMPER LIMITER HAS BEEN INVESTIGATED SPECTROSCOPICALLY UNDER DEUTERIUM PLASMA BOMBARDMENT. THE MATERIALS USED INCLUDE VIRGIN POCO AFX-5Q GRAPHITE, GRAPHITE TILE PIECES FROM THE REDEPOSITION-DOMINATED AND EROSION-DOMINATED AREAS OF THE BUMPER LIMITER IN TFTR. IT HAS BEEN FOUND IN COMMON FOR THESE GRAPHITE MATERIALS THAT THE CHEMICAL EROSION YIELD MAXIMISES AT A TEMPERATURE AROUND 550 C. HOWEVER, GRAPHITE FROM THE REDEPOSITED AREA HAS SHOWN A SOMEWHAT HIGHER MAXIMUM EROSION YIELD AND SIGNIFICANTLY STEEPER TEMPERATURE DEPENDENCE. IN ADDITION THE REMOVABILITY OF THE REDEPOSITED MATERIALS BY HELIUM PLASMA BOMBARDMENT HAS BEEN STUDIED. THE REMOVAL RATE IS FOUND TO BE SIMILAR TO THE PHYSICAL SPUTTERING YIELD OF CARBON BY HELIUM. THE SURFACE MORPHOLOGY AND SURFACE COMPOSITION HAS BEEN ANALYZED WITH SEM AND EMPA IN PARALLEL WITH THESE EROSION BEHAVIOUR MEASUREMENTS.

Additional information

Authors: HIROOKA Y, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;POSPIESZCZYK A, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;CONN R W, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;LABOMBARD B, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;MILLS, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;NYGREN R E, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;RA Y UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF., UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;KFA, D, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA, UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF.;KFA, D;SANDIA NATIONAL LAB., LIVERMORE, CALIF., USA
Bibliographic Reference: REPORT UCLA-PPG-1174, 1988, AVAILABILITY: UNIVERSITY OF CALIFORNIA, LOS ANGELES, CALIF., USA
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