Estimation of tungsten production from the upper divertor in EAST during edge localized modes

doi:10.1088/1674-1056/ab5279

中国物理B ›› 2019, Vol. 28 ›› Issue (12): 125201-125201.doi: 10.1088/1674-1056/ab5279

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Estimation of tungsten production from the upper divertor in EAST during edge localized modes

Jing Ou(欧靖), Nong Xiang(项农), Zong-Zheng Men(门宗政), Ling Zhang(张凌), Ji-Chan Xu(许吉禅), Wei Gao(高伟)

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
2 Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China

收稿日期:2019-07-18 修回日期:2019-10-22 出版日期:2019-12-05 发布日期:2019-12-05
通讯作者: Jing Ou E-mail:ouj@ipp.ac.cn
基金资助:
Project supported by the National Key R&D Program of China (Grant Nos. 2017YFE0300400 and 2017YFE0301300), the National Natural Science Foundation of China (Grant Nos. 11475223 and 11775257), the National Magnetic Confinement Fusion Science Program of China (Grant No. 2015GB101003), and also partly supported by AHNSF of China (Grant No. 1808085J07).

Estimation of tungsten production from the upper divertor in EAST during edge localized modes

Jing Ou(欧靖)^1,2, Nong Xiang(项农)^1,2, Zong-Zheng Men(门宗政)¹, Ling Zhang(张凌)¹, Ji-Chan Xu(许吉禅)¹, Wei Gao(高伟)¹

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
2 Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, China

Received:2019-07-18 Revised:2019-10-22 Online:2019-12-05 Published:2019-12-05
Contact: Jing Ou E-mail:ouj@ipp.ac.cn
Supported by:
Project supported by the National Key R&D Program of China (Grant Nos. 2017YFE0300400 and 2017YFE0301300), the National Natural Science Foundation of China (Grant Nos. 11475223 and 11775257), the National Magnetic Confinement Fusion Science Program of China (Grant No. 2015GB101003), and also partly supported by AHNSF of China (Grant No. 1808085J07).

摘要/Abstract

摘要： During edge localized modes (ELMs), the sheath evolution in front of the Experimental Advanced Superconducting Tokamak (EAST) upper divertor is studied to estimate the sputtered tungsten (W) atoms from the divertor target. A large potential drop across the sheath is formed during ELMs by compared with inter-ELMs, and the maximum of sheath potential drop can exceed one thousand of eV in current EAST operation. Due to the enhancement of the sheath potential drop during ELMs, the W physical sputtering yield from the deuterium (D) ions and the impurity ions on the upper divertor target is found to be significant. It is established that the sputtered W yield during ELMs is at least higher by an order of magnitude than inter-ELMs, and D ions and carbon (C) ions are the main ions governing the W production for the current H-mode with ELMs discharges. With increase in the pedestal electron temperature, the maximum of the D and C ion impact energy during ELMs shows a nearly linear increase, and the D ions have sufficient impact energy to cause the strong W physical sputtering. As a consequence, the D ions may dominate the sputtered W flux from the divertor target when the C concentration is controlled less than one percent for the higher heating power H-mode with ELM discharges in near future.

关键词: sheath, edge localized modes, impact energy

Abstract: During edge localized modes (ELMs), the sheath evolution in front of the Experimental Advanced Superconducting Tokamak (EAST) upper divertor is studied to estimate the sputtered tungsten (W) atoms from the divertor target. A large potential drop across the sheath is formed during ELMs by compared with inter-ELMs, and the maximum of sheath potential drop can exceed one thousand of eV in current EAST operation. Due to the enhancement of the sheath potential drop during ELMs, the W physical sputtering yield from the deuterium (D) ions and the impurity ions on the upper divertor target is found to be significant. It is established that the sputtered W yield during ELMs is at least higher by an order of magnitude than inter-ELMs, and D ions and carbon (C) ions are the main ions governing the W production for the current H-mode with ELMs discharges. With increase in the pedestal electron temperature, the maximum of the D and C ion impact energy during ELMs shows a nearly linear increase, and the D ions have sufficient impact energy to cause the strong W physical sputtering. As a consequence, the D ions may dominate the sputtered W flux from the divertor target when the C concentration is controlled less than one percent for the higher heating power H-mode with ELM discharges in near future.

Key words: sheath, edge localized modes, impact energy

中图分类号: (Plasma sheaths)

52.40.Kh

52.25.Vy (Impurities in plasmas) 52.40.Hf (Plasma-material interactions; boundary layer effects)

欧靖, 项农, 门宗政, 张凌, 许吉禅, 高伟. Estimation of tungsten production from the upper divertor in EAST during edge localized modes[J]. 中国物理B, 2019, 28(12): 125201-125201.

Jing Ou(欧靖), Nong Xiang(项农), Zong-Zheng Men(门宗政), Ling Zhang(张凌), Ji-Chan Xu(许吉禅), Wei Gao(高伟). Estimation of tungsten production from the upper divertor in EAST during edge localized modes[J]. Chin. Phys. B, 2019, 28(12): 125201-125201.

参考文献 28

[1]	Krieger K, Maier H, Neu R and ASDEX Upgrade Team 1999 J. Nucl. Mater. 266-269 207 doi: 10.1016/S0022-3115(98)00890-3
[2]	Matthews G F, Beurskens M, Brezinsek S, Groth M, Joffrin E, Loving A, Kear M, Mayoral M L, Neu R, Prior P, Riccardo V, Rimini F, Rubel M, Sips G, Villedieu E, de Vries P, Watkins M L and EFDA-JET contributors 2011 Phys. Scr. T145 014001 doi: 10.1088/0031-8949/2011/T145/014001
[3]	Yao D, Luo G, Du S, Cao L, Zhou Z, Xu T, Ji X, Liu C, Liang C, Li Q, Wang W, Zhao S, Xu Y, Li L, Wang Z, Xiao X, Qi M, Wang S and Li J 2015 Fusion Eng. 98-99 1692 doi: 10.1016/j.fusengdes.2015.06.084
[4]	Wan Y, Li J, Liu Y, Wang X, Chan V, Chen C, Duan X, Fu P, Gao X, Feng K, Liu S, Song Y, Weng P, Wan B, Wan F, Wang H, Wu S, Ye M, Yang Q, Zheng G, Zhuang G, Li Q and CFETR team 2017 Nucl. Fusion 57 102009 doi: 10.1088/1741-4326/aa686a
[5]	Wan B N, Liang Y F, Gong X Z, Li J G, Xiang N, Xu G S, Sun Y W, Wang L, Qian J P, Liu H Q, Zhang X D, Hu L Q, Hu J S, Liu F K, Hu C D, Zhao Y P, Zeng L, Wang M, Xu H D, Luo G N, Garofalo A M, Ekedahl A, Zhang L, Zhang X J, Huang J, Ding B J, Zang Q, Li M H, Ding F, Ding S Y, Lyu B, Yu Y W, Zhang T, Zhang Y, Li G Q, Xia T Y, EAST team and Collaborators 2017 Nucl. Fusion 57 102019 doi: 10.1088/1741-4326/aa7861
[6]	Garofalo A M, Gong X Z, Qian J, Chen J, Li G, Li K, Li M H, Zhai X, Bonoli P, Brower D, Cao L, Cui L, Ding S, Ding W X, Guo W, Holcomb C, Huang J, Hyatt A, Lanctot M, Lao L L, Liu H, Lyu B, McClenaghan J, Peysson Y, Ren Q, Shiraiwa S, Solomon W, Zang Q and Wan B 2017 Nucl. Fusion 57 076037 doi: 10.1088/1741-4326/aa7186
[7]	Philipps V 2011 J. Nucl. Mater. 415 S2
[8]	Moulton D, Ghendrih Ph, Fundamenski W, Manfredi G and Tskhakaya D 2013 Plasma Phys. Control. Fusion 55 085003 doi: 10.1088/0741-3335/55/8/085003
[9]	Bergmann A 2002 Nucl. Fusion 42 1162 doi: 10.1088/0029-5515/42/9/315
[10]	Dai S and Wang D 2018 Nucl. Fusion 58 014006 doi: 10.1088/1741-4326/aa8e17
[11]	Guillemaut G, Jardin A, Horacek J, Borodkina I, Autricque A, Arnoux G, Boom J, Brezinsek S, Coenen J W, Luna E De La, Devaux S, Eich T, Harting D, Kirschner A, Lipschultz B, Matthews G F, Meigs A, Moulton D, O'Mullane M, Stamp M and JET contributors 2016 Phys. Scr. T167 014005 doi: 10.1088/0031-8949/2015/T167/014005
[12]	Mao H, Ding F, Luo G, Hu Z, Chen X, Xu F, Hu J, Zuo G, Sun Z, Yu Y, Wu J, Wang L, Duan Y, Xu J, Chen J, Yang Z, Ding R, Xie H and EAST team 2017 Nucl. Mater. Energy 12 447 doi: 10.1016/j.nme.2016.12.010
[13]	Xie H, Ding R, Kirschner A, Chen J L, Ding F, Mao H M, Feng W, Borodin D and Wang L 2017 Phys. Plasmas 24 092512 doi: 10.1063/1.4991457
[14]	Wang F, Zha X J, Duan Y M, S T Mao S T, Wang L, Zhong F C, Liang L, Li L, Lu H W, Hu L Q, Chen Y P and Yang Z D 2018 Plasma Phys. Control. Fusion 60 125005 doi: 10.1088/1361-6587/aae339
[15]	Dai S, Wang L, Kirschner A and Wang D 2015 Nucl. Fusion 55 043003 doi: 10.1088/0029-5515/55/4/043003
[16]	Havlickova E, Fundamenski W, Tskhakaya D, Manfredi G and Moulton D 2012 Plasma Phys. Control. Fusion 54 045002 doi: 10.1088/0741-3335/54/4/045002
[17]	Manfredi G, Hirstoaga S and Devaux S 2011 Plasma Phys. Control. Fusion 53 015012 doi: 10.1088/0741-3335/53/1/015012
[18]	Sun Z, Sang C, Hu W and Wang D 2014 Acta Phys. Sin. 63 145204 (in Chinese)
[19]	Franklin R N 2003 J. Phys. D: Appl. Phys. 36 1806 doi: 10.1088/0022-3727/36/15/310
[20]	Lin B, Xiang N, Ou J and Zhao X 2017 Chin. Phys. Lett. 34 015203 doi: 10.1088/0256-307X/34/1/015203
[21]	Riemann K U 1995 IEEE Transaction Plasma Science 23 709 doi: 10.1109/27.467993
[22]	Chung H K, see https://www-amdis.iaea.org/FLYCHK/for NLTE kinetics modeling code
[23]	Zhang L, Morita S, Xu Z, Wu Z, Zhang P, Wu C, Gao W, Ohishi T, Goto M, Shen J, Chen Y, Liu X, Wang Y, Dong C, Zhang H, Huang X, Gong X, Hu L, Chen J, Zhang X, Wan B and Li J 2015 Rev. Sci. Instrum. 86 123509 doi: 10.1063/1.4937723
[24]	Yamamura Y 1996 At. Data Nucl. Data Tables 62 149 doi: 10.1006/adnd.1996.0005
[25]	Yamamura Y, Itikawa Y and Itoh N 1983 Angular dependence of sputtering yields of monoatomic solids Institute of Plasma Physics, Nagoya, Japan Report number IPPJ-AM-26
[26]	Han X, Zang Q, Xiao S, Wang T, Hu A, Tian B, Li D, Zhou H, Zhao J, Hsieh C, Li M, Yan N, Gong X, Hu L, Xu G, Gao X and EAST team 2017 Plasma Phys. Control. Fusion 59 045007 doi: 10.1088/1361-6587/aa5c95
[27]	Dong L, Duan Y, Chen K, Yang X, Zhang L, Xu F, Chen J, Mao S, Wu Z and Hu L 2018 Plasma Sci. Technol. 20 065102 doi: 10.1088/2058-6272/aab20c
[28]	Liu C, Zhang L, Cao L, Li L, Han L, Wang Z, Xu H, Liu Y, Liu L, Yao D, Gong X and Song Y 2017 Fusion Eng. 125 93 doi: 10.1016/j.fusengdes.2017.11.001

Estimation of tungsten production from the upper divertor in EAST during edge localized modes

Estimation of tungsten production from the upper divertor in EAST during edge localized modes

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