The effects of abnormal discharges in tokamaks have been simulated by means of an electron-beam gun with pulse length from 1 to 20 ms and power peak density ranging between 1 × 108and 4 × 1010W.m-2. Physical and chemical changes induced by thermal shock on SiC/C and CFC composites have been compared with modifications occurring in the same materials during our previous investigations under steady-state high-flux plasma irradiation in a plasma-material interaction facility. Experimental results obtained by EB-disruption simulation effects through SEM and AES data on the SiC/C and CFC specimens analyzed agree well with a numerical simulation of disruptive events carried out using the Heating-6 thermal code. Furthermore, the damage produced (such as microstructural changes, fissures, preferential sublimation) confirms that a disruption is the most critical event far the plasma-facing material lifetime. The measured chemical composition changes, according to AES data, indicate that a C-depletion of the plasma-facing surface may occur, probably due to plasma disruptive events.
All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering
- Condensed Matter Physics
Franconi, E., & Brossa, F. (1996). Disruption simulation effects on SiC/C and CFC composites as plasma-facing materials. Plasma Devices and Operations, 4(3-4), 257 - 265. https://doi.org/10.1080/10519999608225579