Effect of Damaging Temperature on Deuterium Retention in Tungsten

Fusion-relevant displacement damage in W and its influence on D retention is explored. Ferroni identified three recovery stages for damaged W near 623, 913, and 1253 K [1], and post-damage annealing at elevated temperature before or during plasma exposure has shown a reduction in D retention [2]. In this work 2 and 5 MeV Cu ions were first used to produce up to 0.2 dpa damage in W samples under various temperatures ranging from 773 to 1273 K that were then exposed to D plasma at 383 K to a fluence of 10$^{24}$ ions/m$^{2}$. Subsequent Nuclear Reaction Analysis and Thermal Desorption Spectrometry show that increased temperature during damage creation reduces D retention more than published post-damage annealing [2]. Experimental results and initial modeling work will be reported. \\[4pt] [1] F. Ferroni et al., Acta Materialia 90, 380-393 (2015)\\[0pt] [2] M.H.J. 't Hoen et al., Nucl. Fusion 53, 043003 (2013)