Deposition Mitigation of the First Mirrors Exposed in EAST with Metal and Carbon Mixed Wall Materials

YAN Rong(鄢容); CHEN Junling(陈俊凌); CHEN Longwei(陈龙威); ZHU Dahuan(朱大焕)

doi:10.1088/1009-0630/16/9/14

Plasma Science and Technology > 2014 > 16(9): 885-889. > DOI: 10.1088/1009-0630/16/9/14

YAN Rong(鄢容), CHEN Junling(陈俊凌), CHEN Longwei(陈龙威), ZHU Dahuan(朱大焕). Deposition Mitigation of the First Mirrors Exposed in EAST with Metal and Carbon Mixed Wall Materials[J]. Plasma Science and Technology, 2014, 16(9): 885-889. DOI: 10.1088/1009-0630/16/9/14

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Deposition Mitigation of the First Mirrors Exposed in EAST with Metal and Carbon Mixed Wall Materials

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

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (No. 2013GB105003) and National Natural Science Foundation of China (No. 11175205)

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Received Date: July 03, 2013

Graphical Abstract

Abstract

Abstract

In order to investigate the effect of aperture geometry on deposition mitigation, stainless steel (SS) first mirrors (FMs) were fixed on the holders of protective aperture geometry with different depth-diameter ratios (DDRs) and exposed in the deposition dominated environment of EAST. A baffle was used during the wall conditioning. The surface properties and reflectivity of the FMs were characterized before and after exposure. It is shown that using aperture geometry and a baffle can effectively mitigate the impurities deposition. The degradation of the surface and specular reflectivity of the FMs is reduced with the increase of DDRs in the range of 0 to 2. The main contaminated elements in a low-Z and high-Z mixed wall materials environment were still carbon and oxygen.
- deposition mitigation,
- specular reflectivity,
- first mirror,
- EAST

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References (15)

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