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Self-consistent modeling of the evolution of the plasma current during disruptions in large tokamaks is presented, taking into account both the generation of runaway electrons and their backreaction on the electric field. It is found that the current profile changes dramatically, so that the postdisruption current carried by runaway electrons is much more peaked than the thermal predisruption current. Although only a fraction of the thermal current is converted into runaway electrons, the central current density increases significantly for typical parameters in JET and ITER. It is also shown that the radial runaway profile can easily become filamented in the radial direction.

Additional information

Authors: ERIKSSON L-G, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HELANDER P, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB) Chalmers University of Technology and EURATOM-VR Assocation, Goteborg (SE);ANDERSSON F, ;ANDERSON D, ;LISAK M,
Bibliographic Reference: An article published in: Physical Review Letters, week ending 21 May 2004, Volume 92, Nr. 20
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Record Number: 200417527 / Last updated on: 2004-06-11
Original language: en
Available languages: en