Study on energy distribution of reflected particles from plasma facing materials

Reflection of ions at a tungsten target was investigated experimentally in a linear plasma device. The tungsten target plate was set perpendicular to the magnetic held, and irradiated by hydrogen and helium plasma. The experi ment measures a current as a function of sheath potential for a fixed angle . The reflected neutral particles from the target plate are measured by neu tral-negative charge convertor made of Cu. The experimental results show go od agreement with the results calculated with TRIM Monte-Carlo simulation c ode. A possibility to estimate the ion temperature is shown through the she ath potential dependence of the ion reflection in the low energy range. (C) 1999 Elsevier Science B.V. All rights reserved.