Runaway electron generation decrease during a major disruption by limiter biasing in tokamaks |
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Authors: | MR Ghanbari M Ghoranneviss S Mohammadi R Arvin |
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Institution: | 1. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, PO Box 14665-678, Tehran, Iranghanbari_phy@yahoo.com;3. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, PO Box 14665-678, Tehran, Iran |
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Abstract: | The high-energy current of runaway electrons during a major disruption in tokamak reactors can cause serious damage to the first wall of the reactors and reduce their life time. Therefore, finding a method to minimize runaway electron generation during a major disruption is much needed. Tokamak limiter biasing is one of the methods that can be used for controlling the radial electric field and can induce a transition to an improved confinement state. This paper attempts to examine the effect of limiter biasing on the generation of runaway electrons during a major disruption. To do so, a horizontal biased limiter placed on the tokamak was used. Main parameters such as plasma current, loop voltage, emitted hard X-ray intensity, magnetohydrodynamic (MHD) oscillation and Hα radiation and spectrum of hard X-rays, in the presence and absence of negative and positive limiter biasing, were measured. The results show that the application of limiter biasing during a major disruption can reduce runaway electron generation. |
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Keywords: | runaway electron limiter biasing tokamak |
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