Current Dynamics during Disruptions in Large Tokamaks
- 19 May 2004
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 92 (20), 205004
- https://doi.org/10.1103/physrevlett.92.205004
Abstract
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.Keywords
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