Study of the Thermal Impact of Powerful Plasma Flows on the Surface of a Tungsten Target Using Infrared Pyrometry

The research investigated the thermal effects of powerful (800–1000 J/cm2, 10–15 µs) hydrogen plasma flows on a tungsten target. Measurements were conducted using a developed fast infrared three-wavelength pyrometer within the material temperature range of 270–5800 K and a time resolution of 0.1 µs. It was demonstrated that the surface temperature of the irradiated target reached the boiling point of tungsten (≈5800 K) during the exposure. Using numerical methods, the thermal power absorbed by the target q(t) was determined. The energy density absorbed by the target (≈35 J/cm2) obtained by integrating q(t) coincides with the value measured by a thermocouple calorimeter.