| Summary: | Deuterium retention in two types of polycrystalline tungsten was studied as a function of ion fluence, irradiation temperature and ion energy. Fluence dependence: D retention at 300 K tends to saturate in both Rembar and Plansee PCW. At 500 K, D retention in the Plansee PCW increases with increasing ion fluence, similar to previous results for Rembar tungsten. Even at a fluence of 8×10^25 D+/m2, no sign of saturation was observed. Temperature dependence: D retention in Plansee PCW decreases with increasing irradiation temperature (300 - 500 K). Energy dependence: varying the D+ energy from 100 to 500 eV/D+ plays a minor role in D retention in W, suggesting that D retention depends more on the W structure, irradiation temperature and fluence, rather than on the ion energy when the energy is below the displacement threshold.
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