Disruption simulation effects on SiC/C and CFC composites as plasma-facing materials

E. Franconi, F. Brossa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)257 - 265
Number of pages9
JournalPlasma Devices and Operations
Volume4
Issue number3-4
DOIs
Publication statusPublished - 1996
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this