Ignition in a tokamak reactor with INTOR-like parameters

C. E. Singer, F. G.P. Seidl, D. E. Post, P. H. Rutherford

Research output: Contribution to journalArticlepeer-review


The requirements for ignition in a tokamak reactor with INTOR-like parameters were studied using a one-dimensional transport code. With "empirical" electron energy diffusivity χe, ignition was obtained with 60-75 MW of neutral beam injection at a volume average pressure ratio 〈β〉=4-5% under a variety of conditions. Changing χe gave ignition at the same 〈β〉 if the plasma minor radius varied as a ∞ χe1/2. The maximum impurity concentration which allows ignition was found to be comparable to that for the much simpler case of a homogeneous plasma with radiative losses only. In long pulse simulations with efficient helium pumping, the maximum toroidal field ripple which allowed ignition was 2.0% (peak-to-peak) at the plasma edge. Ignition was maintained with over 99% recycling of helium ash using 5% less than maximum ripple.

Original languageEnglish (US)
Pages (from-to)275-284
Number of pages10
JournalJournal of Fusion Energy
Issue number3
StatePublished - Jul 1981
Externally publishedYes


  • Ignition
  • field ripple
  • tokamak reactors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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