PIC-EDDY Simulation of Different Impurities Deposition in Gaps of Carbon Tiles

XU Qian(徐倩); DING Rui(丁锐); YANG Zhongshi(杨钟时); NIU Guojian(牛国鉴); K. OHYA; LUO Guangnan(罗广南)

doi:10.1088/1009-0630/16/6/04

Plasma Science and Technology > 2014 > 16(6): 562-566. > DOI: 10.1088/1009-0630/16/6/04

XU Qian(徐倩), DING Rui(丁锐), YANG Zhongshi(杨钟时), NIU Guojian(牛国鉴), K. OHYA, LUO Guangnan(罗广南). PIC-EDDY Simulation of Different Impurities Deposition in Gaps of Carbon Tiles[J]. Plasma Science and Technology, 2014, 16(6): 562-566. DOI: 10.1088/1009-0630/16/6/04

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PIC-EDDY Simulation of Different Impurities Deposition in Gaps of Carbon Tiles

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2 Institute of Technology and Science, The University of Tokushima, Tokushima 770-8506, Japan

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2011GB110003, 2011GB110001 and 2013GB107004), National Natural Science Foundation of China (Nos. 11005125, 11205198 and 11375010)

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Received Date: August 26, 2013

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Abstract

A 3D Monte Carlo (MC) code PIC- EDDY, based on EDDY (erosion and deposition dynamic simulation) code, was used to investigate the redeposition of different impurities in the gaps of C tiles. By incorporating the rate coefficients of beryllium (Be) and tungsten (W) into the code, we obtain deposition profiles of hydrocarbon, beryllium and tungsten particles in the toroidal and poloidal gaps, respectively. The redeposition rate of tungsten was found to be higher than those of other impurities in the gaps, except at the bottom, due to its easier local deposition within one gyroradius. Due to the effect of reflection coefficients of hydrocarbon fragments on graphite, fewer hydrocarbons were resided at the entrance while more were deposited on the sides of the gap. At elevated plasma temperatures (such as 30 eV), asymmetric deposition distributions were observed between the toroidal and poloidal gaps due to the dominant ionized particles. Ions were mainly deposited within 1 mm depth inside gaps, and the bottom deposition particles were almost all neutrals.
- Monte Carlo,
- deposition,
- transport,
- gap

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