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A two-stage operator splitting algorithm was used to time advance the three dimensional Fokker-Planck equation for the electron distribution function in a tokamak. During the first stage, derivatives in two of the dimensions were advanced together implicitly. Derivatives in the remaining dimension were advanced during the second stage. This algorithm gives accurate solutions in modest CPU times, unlike alternative schemes considered. The technique, which includes features that accommodate the internal boundary conditions arising from trapped electron effects, is described.

Additional information

Authors: MCKENZIE J S, UKAEA, Culham Laboratory, Abingdon, Oxon. (GB);O'BRIEN M R, UKAEA, Culham Laboratory, Abingdon, Oxon. (GB);COX M, UKAEA, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: AEA FUS 76 EN (1990) 23 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199110037 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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