Snowflake Divertor Simulation for an HL-2M Conceptual Design

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 s...

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Bibliographic Details
Published in:Chinese physics letters 2012, Vol.29 (10), p.105202-1-105202-3
Main Authors: ZHENG, Guo-Yao, PAN, Yu-Dong, FENG, Kai-Ming, HE, Hong-Da, CUI, Xue-Wu
Format: Article
Language:English
Subjects:
Density
Heating
Magnetic flux
Peak load
Plasma density
Snowflakes
Upstream
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Summary: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 x 10 super(19)m super(3) with 10 MW heating power flowing into the SOL/divertor regions, the peak load at the outer divertor is 1.64MW/m super(2) for the SF divertor, but it is 3.2 MW/m super(2) 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.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/29/10/105202