Abstract
Deuterium (D) retention in Tungsten (W) under plasma heat loads relevant to edge localized modes in ITER was experimentally investigated at the QSPA-T plasma gun facility. Samples were exposed to 1.0 ms D plasma pulses with different heat loads in the range of 0.4−3.7 MJm−2 (heat flux factor P√t = 13.3−123 MJm−2s−0.5). A significant D retention was observed already after one pulse. Moreover, the D retention grew up continuously with increasing the power load, although the surface was melted at highest loads (above 1.4 MJ m−2). The D retention was higher than that in the case of stationary plasma irradiation at 600–700 K, indicating possible significant contribution of ELM’s-like events to the total D retention. All stages of the experiments (irradiation, storage time and TDS) have been simulated using the TMAP 7 code.
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