Magnetic configuration flexibility of snowflake divertor for HL-2M |
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| Affiliation: | 1. Southwestern Institute of Physics, Chengdu, People''s Republic of China;2. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;3. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, People''s Republic of China;1. National Fusion Research Institute, 169-148 Gwahangno, Yuseong-gu, Daejeon 305-806, South Korea;2. PQ TECH INC., Youngtong-dong, Youngtong-gu, Suwon 443-813, South Korea;3. KYUNGIL University, 50 Gamasil-gil, Gyeongsan-si, Gyeongsangbuk-do, South Korea |
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| Abstract: | HL-2M (Li, 2013 1]) is a tokamak device that is under construction. Based on the magnetic coils design of HL-2M, four kinds of divertor configurations are calculated by CORSICA code (Pearlstein et al., 2001 2]) with the same main plasma parameters, which are standard divertor, exact snowflake divertor, snowflake-plus divertor and snowflake-minus divertor configurations. The potential properties of these divertors are analyzed and presented in this paper: low poloidal field area around X-point, connection length from outside mid-plane to the primary X-point, target plate design and magnetic field shear. The results show that the snowflake configurations not only can reduce the heat load at divertor target plates, but also may improve the magneto-hydrodynamic stability by stronger magnetic shear at the edge. A new divertor configuration, named “tripod divertor”, is designed by adjusting the positions of the two X-points according to plasma parameters and magnetic coils current of HL-2M. |
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| Keywords: | Snowflake divertor Poloidal field Magnetic field shear Tripod divertor |
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