Impurity levels and power loading in the pdx tokamak with high power neutral beam injection

R. J. Fonck, M. Bell, K. Bol, K. Brau, R. Budny, J. L. Cecchi, Samuel A. Cohen, S. Davis, H. F. Dylla, Robert James Goldston, B. Grek, R. J. Hawryluk, J. Hirschberg, D. Johnson, R. Hülse, R. Kaita, S. Kaye, R. J. Knize, H. Kugel, D. ManosD. Mansfield, K. Mcguire, D. Mueller, K. Oasa, M. Okabayashi, D. K. Owens, J. Ramette, R. Reeves, M. Reusch, G. Schmidt, S. sesnic, S. Suckewer, H. Takahashi, F. Tenney, P. Thomas, M. Ulrickson, R. Yelle

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


The PDX tokamak provides an experimental facility for the direct comparison of various impurity control techniques under reactor-like conditions. Four neutral beam lines inject > 6 MW for 300 ms. Carbon rail limiter discharges have been used to test the effectiveness of perpendicular injection, but non-disruptive full power operation for > 100 ms is difficult without extensive conditioning. Initial tests of a toroidal bumper limiter indicate reduced power loading and roughly similar impurity levels compared to the carbon rail limiter discharges. Poloidal divertor discharges with up to 5 MW of injected power are cleaner than similar circular discharges, and the power is deposited in a remote divertor chamber. High density divertor operation indicates a reduction of impurity flow velocity in the divertor and enhanced recycling in the divertor region during neutral injection.

Original languageEnglish (US)
Pages (from-to)343-354
Number of pages12
JournalJournal of Nuclear Materials
Issue numberC
StatePublished - 1982

All Science Journal Classification (ASJC) codes

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


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