Influence of Pre-Irradiation by a High Heat Flux on Reemission and Thermal Desorption of Implanted Deuterium from Reduced-Activation Steels
The yield of deuterium from samples of low-activation Eurofer steel was studied by direct measuring of the reemission during ion irradiation and also by means of thermal desorption spectroscopy without contact with the atmosphere. Some experiments were carried out on a sample previously subjected to a powerful pulsed thermal action in QSPA-T (TRINITY). Further irradiation was performed using a 5 keV ${\text{D}}_{3}^{ + }$ ion beam at room temperature to a fluence of 1021 m–2. In all cases, most of implanted deuterium left the sample already at the stage of irradiation. A significant part of deuterium desorbed also after the irradiation and before spectroscopic measurements. The reemission of deuterium from damaged samples reached a maximum value slower than from undamaged ones, and yield of deuterium during the aging was more intense. This can be explained by a structure of damage caused by the heat flow: the concentration of hydrogen traps grows in the material and the surface area, from which desorption occurs, increases.