Runaway electron drift orbits in magnetostatic perturbed fields
Paper in proceedings, 2010

Disruptions in large tokamaks can lead to the generation of a relativistic runaway electron beam that may cause serious damage to the first wall. To mitigate the disruption and suppress the runaway beam the application of resonant magnetic perturbations has been suggested. In this work we investigate the effect of resonant magnetic perturbations on the confinement of runaway electrons by simulating their drift orbits in magnetostatic perturbed fields and calculating the orbit losses for various initial energies and magnetic perturbation magnitudes. In the simulations we use a TEXTOR-like configuration and solve the relativistic, gyro-averaged drift equations for the runaway electrons including synchrotron radiation and collisions. The results indicate that runaway electrons are well confined in the core of the device, but the onset time of runaway losses closer to the edge is dependent on the magnetic perturbation level and thereby can affect the maximum runaway current. However, the runaway current damping rate is not sensitive to the magnetic perturbation level, in agreement with experimental observations.

Author

Gergely Papp

Chalmers, Applied Physics, Nuclear Engineering

Michael Drevlak

Tünde Fülöp

Chalmers, Applied Physics, Nuclear Engineering

Proceedings of 23rd IAEA Fusion Energy Conference, Korea 2010

Subject Categories

Fusion, Plasma and Space Physics

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Created

10/6/2017