High temperature transient heating experiments on C in a Be seeded plasma in PISCES B.

An experimental investigation of the effects of transient heating on Be films on C substrates in deuterium plasmas has been conducted in PISCES-B. It has been shown previously that Be film growth on C can form carbide layers that reduce the chemical erosion of C during deuterium ion bombardment. Results from transient heating up to 1200$^{\circ}$C have also been reported. In this presentation, results on the chemical erosion and on deuterium retention in C targets with heat pulses up to 2000$^{\circ}$C will be presented. A scaling expression for chemical erosion suppression due to Be2C formation developed previously will be extended to include transients with varying peak surface temperature and duty cycle using an integrated time-temperature, with a temperature range of 300 to 2000$^{\circ}$C.