Study of Divertor Heat Patterns Induced by LHCD L-Mode Plasmas Using an Infra-Red Camera System on EAST

ZHANG Bin (张斌); GAN Kaifu (甘开福); GONG Xianzu (龚先祖); ZHANG Xiaodong (张晓东); WANG Fumin (王福敏); YANG Zhendong (仰振东); CHEN Meiwen (陈美文); WANG Xiaoqiong (王晓琼); the EAST Team

doi:10.1088/1009-0630/17/10/04

Plasma Science and Technology > 2015 > 17(10): 831-836. > DOI: 10.1088/1009-0630/17/10/04

ZHANG Bin (张斌), GAN Kaifu (甘开福), GONG Xianzu (龚先祖), ZHANG Xiaodong (张晓东), WANG Fumin (王福敏), YANG Zhendong (仰振东), CHEN Meiwen (陈美文), WANG Xiaoqiong (王晓琼), the EAST Team. Study of Divertor Heat Patterns Induced by LHCD L-Mode Plasmas Using an Infra-Red Camera System on EAST[J]. Plasma Science and Technology, 2015, 17(10): 831-836. DOI: 10.1088/1009-0630/17/10/04

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Study of Divertor Heat Patterns Induced by LHCD L-Mode Plasmas Using an Infra-Red Camera System on EAST

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

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Received Date: September 25, 2014

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Abstract

Abstract

Divertor heat patterns induced by Lower Hybrid Current Drive (LHCD) L-mode plasmas are investigated using an infra-red (IR) camera system on an Experimental Advanced Superconducting Tokamak (EAST). A two-dimensional finite element analysis code DFlux is used to compute heat flux along the poloidal divertor target and corresponding quantities. Outside the Origin Strike Zone (OSZ), a Second Peak Heat Flux (SPHF) zone, where the heat flux is even stronger than that at the OSZ, appears on the lower-outer (LO) divertor plates with LHCD and disappears immediately after switching o? the LHCD. The main heat-flux shifts from the SPHF zone towards the OSZ when the divertor configuration converts from double null to lower single null, indicating that the growth of the SPHF zone is apparently affected by a plasma magnetic con?guration. The heat patterns on the LO divertor plates are observed to be different from that on the lower-inner (LI) targets as the SPHF zone appears only on the LO divertor target. It is also found that the heat flux at the SPHF zone was obviously enhanced after the Supersonic Molecule Beam Injection (SMBI) pulse.
- LHCD} IR camera,
- SPHF zone,
- SMBI

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References (1)

References

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