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Wall cleaning has been used popularly on tokamaks to reduce impurities and fuel recycling. Since 2008, the plasma facing components of EAST have been all of graphite. Due to the special crystal structure of graphite, high outgassing rate and strong absorption of hydrogen gas are induced. The wall cleaning is in particular important for the pre-treatment before the plasma operation of the machine. In this article, we introduce the wall conditioning system on EAST, and study the removal efficiency of device baking and glow discharge cleaning in different working gases and at different operating parameters. The long duration baking and GDC cleaning in EAST notably reduce the wall outgassing, and impurity radiation. After the cleanings, plasma is easily obtained, which is beneficial for the plasma physics experiment.
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Keywords:
- wall conditioning /
- glow discharge cleaning /
- baking
[1] Hu J S, Li J G, Wang X M 2006 J. Nucl. Mater. 350 9
[2] Huang Q C, Luo J R, Wang H Z, Li C 2006 Acta Phys. Sin. 55 286 (in Chinese) [黄勤超, 罗家融, 王华忠, 李翀 2006 物理学报 55 286]
[3] Hu J S, Wang X M, Li J H, Wu J H, Chen Y, Wang H Y, Yang D W, Luo N C, Li S F, Li G Y, Wang L, Yu Y W, Dou R C, Hu Q S, Bao L M, Zhao Y P, Li J G, EAST vacuum and wall conditioning group 2009 Fusion Eng. Design 84 2167
[4] Xu X J, Zhu D C 1995 Gas Discharge Physics (Shanghai: Fudan University Press) p121 (in Chinese) [徐学基, 诸定昌 1995 气体放电物理(上海:复旦大学出版社) 第121页]
[5] Li J H, Hu J S, Wang X M, Wang L, Chen Y, Yu Y Y, Wang H Y, Wu J H, Zuo G Z, Tang M, Zhuang H D 2010 Vacuum 46 11 (in Chinese) [李加宏, 胡建生, 王小明, 王玲, 陈跃, 余耀伟, 王厚银, 吴金华, 左贵忠, 唐明, 庄会东 2010 真空 46 11]
[6] Chen Y, Zhang Y, Yang D W, Wang L, Hu J S, Li J H, Wu J H, Wang X M, EAST vacuum group 2012 Phys. Procedia 32 14
[7] Wang H Y, Hu J S, Wang X M, Chen Q, Cao B, Yu Y W, Wu J H, Chen Y, Li J H, EAST vacuum group 2012 Phys. Procedia 32 235
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[1] Hu J S, Li J G, Wang X M 2006 J. Nucl. Mater. 350 9
[2] Huang Q C, Luo J R, Wang H Z, Li C 2006 Acta Phys. Sin. 55 286 (in Chinese) [黄勤超, 罗家融, 王华忠, 李翀 2006 物理学报 55 286]
[3] Hu J S, Wang X M, Li J H, Wu J H, Chen Y, Wang H Y, Yang D W, Luo N C, Li S F, Li G Y, Wang L, Yu Y W, Dou R C, Hu Q S, Bao L M, Zhao Y P, Li J G, EAST vacuum and wall conditioning group 2009 Fusion Eng. Design 84 2167
[4] Xu X J, Zhu D C 1995 Gas Discharge Physics (Shanghai: Fudan University Press) p121 (in Chinese) [徐学基, 诸定昌 1995 气体放电物理(上海:复旦大学出版社) 第121页]
[5] Li J H, Hu J S, Wang X M, Wang L, Chen Y, Yu Y Y, Wang H Y, Wu J H, Zuo G Z, Tang M, Zhuang H D 2010 Vacuum 46 11 (in Chinese) [李加宏, 胡建生, 王小明, 王玲, 陈跃, 余耀伟, 王厚银, 吴金华, 左贵忠, 唐明, 庄会东 2010 真空 46 11]
[6] Chen Y, Zhang Y, Yang D W, Wang L, Hu J S, Li J H, Wu J H, Wang X M, EAST vacuum group 2012 Phys. Procedia 32 14
[7] Wang H Y, Hu J S, Wang X M, Chen Q, Cao B, Yu Y W, Wu J H, Chen Y, Li J H, EAST vacuum group 2012 Phys. Procedia 32 235
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