| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Snowflake Divertor Simulation for an HL-2M Conceptual Design |
| ZHENG Guo-Yao**, PAN Yu-Dong, FENG Kai-Ming, HE Hong-Da, CUI Xue-Wu |
Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041
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| Cite this article: |
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ZHENG Guo-Yao, PAN Yu-Dong, FENG Kai-Ming et al 2012 Chin. Phys. Lett. 29 105202 |
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Abstract A conceptual design study of the HL-2M facility has shown that one can create not only a standard single-null divertor configuration on it, but also a second-order null (snowflake (SF)) configuration. For the SF divertor, the magnetic flux expansion closes to the separatrix and exceeds that of the standard configuration by more than a factor of 4 at the outer divertor. The heat load at the divertor targets of this innovative configuration has been investigated by using B2.5-Eirene. It is shown that the heat load it targets is different from that of the standard configuration. As a result of the magnetic flux expansion, the peak heat load reduces and does not concentrate on a small area near the separatrix. The heat load profile becomes flat as compared to the standard divertor. When the upstream density is 2.0×1019/m3 with 10 MW heating power flowing into the SOL/divertor regions, the peak load at the outer divertor is 1.64 MW/m2 for the SF divertor, but it is 3.2 MW/m2 for the standard divertor, so the SF divertor can mitigate the heat load at the divertor targets when HL-2M operates at low plasma density and high heating power.
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Received: 10 July 2012
Published: 01 October 2012
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| PACS: |
52.55.-s
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(Magnetic confinement and equilibrium)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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52.55.Rk
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(Power exhaust; divertors)
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Abstract
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