Stochastic instability of runaway electrons in tokamaks
The motion of runaway electrons in tokamak field configuration is found to be unstable with respect to a stochastic instability due to nonlinear cyclotron resonances with the toroidal magnetic field ripple. It is demonstrated that some neighbouring poloidal harmonics of these relativistic resonances overlap. The resulting instability provides an efficient mechanism to convert the parallel kinetic energy driven by the loop voltage into a perpendicular one. When combined with cyclotron losses this conversion acts as an effective radiative slowing-down process, causing an energy limit in agreement with recent observations.
Bibliographic Reference: Article: Europhysics Letters, Vol. 11 (1990) No. 3, pp. 219-224
Record Number: 199010729 / Last updated on: 1994-12-01
Original language: en
Available languages: en