Thermal Desorption Behaviors in an Advanced Reduced-Activation Alloy under Helium-Deuterium Sequential Irradiations

The desorption behaviors of deuterium and helium gases in an advanced reduced-activation alloy (ARAA) under sequential irradiations with helium and deuterium ions were analyzed using thermal desorption spectroscopy (TDS). At room temperature, ARAA samples were and were not irradiated with helium ions (1.4, 5.0, or 7.0 keV) at a fixed fluence of 5.0×1021 He/m2 and were sequentially irradiated with 1.7-keV deuterium ions at a fixed fluence of 6.5×1021 D/m2. Immediately after the irradiation, TDS measurements were performed in-situ, without exposure of the sample to air. The amount of desorbed deuterium decreased with increasing energy of the helium ions up to 5.0 keV; however, the amount of desorbed deuterium increased when the energy of the helium ions was increased to 7.0 keV. The amount of desorbed helium gradually increased with increasing energy of the irradiating helium ions.