Deuterium retention in different tungsten grades

Deuterium retention in different tungsten (W) grades was investigated for various incident ion energies ranging from 3 to 200 eV per deuterium atom and fluences ranging from 1 x 10(23) m(-2) to 2 x 10(25) m(-2). Irradiation temperatures were 320 and 500 K. The retained amount was determined by ion beam analysis and thermal desorption spectroscopy. For irradiation at 320 K, deuterium retention in plasma-sprayed tungsten (PSW) is higher compared to polycrystalline W for all investigated energies. For irradiation at 500 K, the deuterium retention for polycrystalline W increases strongly with fluence in contrast to PSW. The highest deuterium inventory was found for ITER grade W irradiated with 200 eV per deuterium at 500 K.