Particle fueling and impurity control in PDX

R. J. Fonck, M. Bell, K. Bol, R. Budny, P. Couture, D. Darrow, H. Dylla, Robert James Goldston, B. Grek, R. Hawryluk, K. Ida, K. Jaehnig, D. Johnson, R. Kaita, S. Kaye, H. Kugel, B. Leblanc, D. Mansfield, T. Mcbride, K. McguireS. Milora, D. Mueller, M. Okabayashi, D. Owens, D. Post, M. Reusch, G. Schmidt, S. Sesnic, H. Takahashi, F. Tenney, M. Ulrickson

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Fueling requirements and impurity levels in neutral-beam-heated discharges in the PDX tokamak have been compared for plasmas formed with conventional graphite rail limiters, a particle scoop limiter, and an open or closed poloidal divertor. Gas flows necessary to obtain a given density are highest for diverted discharges and lowest for the scoop limiter. Hydrogen pellet injection provides an efficient alternative fueling technique, and a multiple pellet injector has produced high density discharges for an absorbed neutral beam power of up to 600 kW, above which higher speeds or more massive pellets are required for penetration to the plasma core. Power balance studies indicate that 30-40% of the total input power is radiated while ~15% is absorbed by the limiting surface, except in the open divertor case, where 60% flows to the neutralizer plate. In all operating configurations, Zeff usually rises at the onset of neutral beam injection. Both open divertor pl;asmas and those formed on a well conditioned water-cooled limiter have Zeff {less-than or approximate} 2 at the end of neutral injection. A definitive comparison of divertors and limiters for impurity control purposes requires longer beam pulses or higher power levels than available on present machines.

Original languageEnglish (US)
Pages (from-to)330-339
Number of pages10
JournalJournal of Nuclear Materials
Issue numberC
StatePublished - Dec 1984

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • General Materials Science
  • Nuclear Energy and Engineering


  • divertors
  • impurities
  • limiters
  • refueling


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