B4C solid target boronization of the MST reversed-field pinch

D. J. Den Hartog, M. Cekic, G. Fiksel, S. A. Hokin, R. D. Kendrick, S. C. Prager, M. R. Stoneking

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

A solid rod of hot-pressed boron carbide is being used as the source of boron during boronization of MST. The most striking result of this procedure is the reduction in oxygen contamination of the plasma (OIII radiation, characteristic of oxygen at the edge, falls by about a factor of 3 after boronization.). The radiated power fraction drops to about half its initial value. Particle reflux from the wall is also lowered, making density control simpler. The rod (12.7 mm diameter) is inserted into the edge plasma of normal high-power RFP discharges. B4C is ablated from the surface of the rod and deposited in a thin film (a-B/C:H) on the walls and limiters. The energy flux carried by "superthermal" (not "runaway") electrons at the edge of MST appears to enhance the efficient, nondestructive ablation of the boron carbide rod.

Original languageEnglish (US)
Pages (from-to)177-183
Number of pages7
JournalJournal of Nuclear Materials
Volume200
Issue number2
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Den Hartog, D. J., Cekic, M., Fiksel, G., Hokin, S. A., Kendrick, R. D., Prager, S. C., & Stoneking, M. R. (1993). B4C solid target boronization of the MST reversed-field pinch. Journal of Nuclear Materials, 200(2), 177-183. https://doi.org/10.1016/0022-3115(93)90328-V