Deuterium retention and thermal conductivity in ion-beam displacement-damaged tungsten

G. R. Tynan, R. P. Doerner, J. Barton, R. Chen, S. Cui, M. Simmonds, Y. Wang, J. S. Weaver, N. Mara, S. Pathak

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Retention of plasma-implanted D is studied in W targets damaged by a Cu ion beam at up to 0.2 dpa with sample temperatures between 300 K and 1200 K. At a D plasma ion fluence of 1024/m2 on samples damaged to 0.2 dpa at 300 K, the retained D retention inventory is 4.6 × 1020 D/m2, about ∼5.5 times higher than in undamaged samples. The retained inventory drops to 9 × 1019 D/m2 for samples damaged to 0.2 dpa at 1000 K, consistent with onset of vacancy annealing at a rate sufficient to overcome the elevated rate of ion beam damage; at a damage temperature of 1200 K retention is nearly equal to values seen in undamaged materials. A nano-scale technique provides thermal conductivity measurements from the Cu-ion beam displacement damaged region. We find the thermal conductivity of W damaged to 0.2 dpa at room temperature drops from the un-irradiated value of 182 ± 3.3 W/m K to 53 ± 8 W/m K.

Original languageEnglish (US)
Pages (from-to)164-168
Number of pages5
JournalNuclear Materials and Energy
Volume12
DOIs
StatePublished - Aug 2017

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