Experimental study of cyclic action of plasma on tungsten

Optoelectronic Methods of IR-Photometry in Solving Thermal and Physical Problems

“…The interaction of plasma with the surface is an important problem when creating protective materials for thermonuclear reactors. Experiments on the interaction of tungsten elements with hydrogen, deuterium, and helium plasmas have shown that it can lead to a change in structure, the development of porosity, and the embrittlement of reactor structural materials [4]. The duration of the pulses created by the plasma gun did not exceed tens of microseconds, and the high temporal resolution necessary for surface temperature monitoring during such a short time interval can not be realized by any known measuring tools other than by using high-speed mid-IR PD pyrometric sensor.…”

Globus-M Experiments With Pre-Damaged Tungsten Divertor

“…Then, the untreated W tiles stopped lightning just after the discharge termination. On the contrary, the heat removal from the bulk of the tiles damaged by 2000 e-beam cycles was obstructed by the loose layer formation and led to the surface [36,37]). Through 5 ms after the discharge termination, the infrared camera has shown a higher temperature of the tile pre-damaged by 2000 e-beam cycles (Fig.…”

“…In addition to the e-beam processing, the pre-damaging was also carried out with the use of plasma gun, which was described in [36,37]. The e-beam loading used in the experiment caused re-melting of the tungsten surface layer and changes of the surface properties.…”