Journal
NUCLEAR FUSION
Volume 54, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0029-5515/54/7/073005
Keywords
beryllium; codeposits; deuterium; ITER; bake-out; thermal release
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Funding
- USDoE [DE-FG02-07ER54912]
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A study of the thermal desorption of deuterium from 1 m thick co-deposited Be-(0.1)D layers formed at 330K by a magnetron sputtering technique is reported. A range of thermal desorption rates 0 <= beta <= 1.0 K s(-1) are explored with a view to studying the effectiveness of the proposed ITER wall and divertor bake procedure (beta = 0 K s(-1)) to be carried out at 513 and 623 K. Fixed temperature bake durations up to 24 h are examined. The experimental thermal release data are used to validate a model input into the Tritium Migration and Analysis Program (TMAP-7). Good agreement with experiment is observed for a TMAP-7 model incorporating trap populations of activation energies for D release of 0.80 and 0.98 eV, and a dynamically computed surface D atomic to molecular recombination rate.
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