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A model for the sawtooth collapse, based on Taylor relaxation of the plasma core in a tokamak, is described. The relaxation is assumed to take place within a central zone determined by the instability of localised resistive interchange modes, and is accompanied by an ideal MHD adjustment of the external region so as to maintain force balance across the interface. Using an aspect ratio expansion, equations determining the post-crash equilibrium are derived and solved in terms of equilibrium quantities prior to collapse. The crash model contains no arbitrary parameters. The simulation results are compared with experimental data, in particular with those from the TEXTOR tokamak where detailed measurements are readily available.

Additional information

Authors: GIMBLETT C G, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);HASTIE R J, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: AEA FUS 260 EN (1994) 30 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199410314 / Last updated on: 1994-11-28
Original language: en
Available languages: en