Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2014-10-01

Journal: 11th International Symposium on Fusion Nuclear Technology (ISFNT)

Included Journals: CPCI-S、EI、SCIE

Volume: 89

Issue: 7-8

Page Number: 1019-1023

ISSN: 0920-3796

Key Words: Runaway electrons; Runaway electron current; Magnetic perturbation; Toroidal effect

Abstract: The generation and diffusion of runaway electrons (REs) during major disruptions in the HL-2A tokamak has been studied numerically. The diffusion caused by the magnetic perturbation is especially addressed. The simulation results show that the strong magnetic perturbation (delta B/B similar to 1.0 x 10(-3)) can cause a significant loss of REs due to the radial diffusion and restrain the RE avalanche effectively. The results also indicate that the REs are generated initially in the plasma core during disruptions, and that the toroidal electric field does not exhibit a centrally hollow phenomenon. In addition, it is found that the toroidal effects have little impact on the generation of RE and the evolution of toroidal electric field. (C) 2014 Elsevier B.V. All rights reserved.