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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 (δB/B∼1.0×10 −3 ) can cause a significant loss of REs due to the radial diffusion and restrain the RE avalanche effectively...
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