Exact treatment of charge exchange loss in beam driven currents

K. Okano

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A two-dimensional fast ion Fokker-Planck equation is analytically solved with a new cross-section formula for charge exchange loss. The new formula includes the exact cross-section dependence on ion energy and is valid from 2 keV up to several hundred keV, where charge exchange is always negligible. A loss of beam driven currents due to the charge exchange has been analysed, using this analytic solution of Fokker-Planck equation. It has been revealed that the previous rough treatment with the charge exchange cross-section, proportional to 1/ nu , sometimes results in a considerable error. By a systematic parametric survey, the reduction rates for beam driven currents, due to charge exchange loss, are rearranged and tabled. Also, a reduction in global current drive efficiency by charge exchange in a next generation Tokamak is briefly discussed.

Original languageEnglish
Article number006
Pages (from-to)1115-1126
Number of pages12
JournalPlasma Physics and Controlled Fusion
Issue number9
Publication statusPublished - 1987 Dec 1

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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