| Citation: |
Jianbin LIU, Lingyi MENG, Houyang GUO, Kedong LI, Jichan XU, Huiqian WANG, Guosheng XU, Fang DING, Ling ZHANG, Yanmin DUAN, Bin ZHANG, Lin YU, Ping WANG, Ang LI, Donggui WU, Rui DING, Liang WANG. Divertor detachment operation in helium plasmas with ITER-like tungsten divertor in EAST[J]. Plasma Science and Technology, 2022, 24(7): 075101. DOI: 10.1088/2058-6272/ac621d
|
Detachment in helium (He) discharges has been achieved in the EAST superconducting tokamak equipped with an ITER-like tungsten divertor. This paper presents the experimental observations of divertor detachment achieved by increasing the plasma density in He discharges. During density ramp-up, the particle flux shows a clear rollover, while the electron temperature around the outer strike point is decreasing simultaneously. The divertor detachment also exhibits a significant difference from that observed in comparable deuterium (D) discharges. The density threshold of detachment in the He plasma is higher than that in the D plasma for the same heating power, and increases with the heating power. Moreover, detachment assisted with neon (Ne) seeding was also performed in L- and H-mode plasmas, pointing to the direction for reducing the density threshold of detachment in He operation. However, excessive Ne seeding causes confinement degradation during the divertor detachment phase. The precise feedback control of impurity seeding will be performed in EAST to improve the compatibility of core plasma performance with divertor detachment for future high heating power operations.
The authors would like to acknowledge the support and contributions of the EAST team. This work was supported by the National Key Research and Development Program of China (Nos. 2017YFA0301300, 2017YFE0402500 and 2019YFE03030000), National Natural Science Foundation of China (Nos. 11905255, 12005004, 12022511, U1867222 and U19A20113), the Institute of Energy, Hefei Comprehensive National Science Center (No. GXXT-2020-004), AHNSF (No. 2008085QA38), the CASHIPS Director's Fund (No. BJPY2019B01) and the Key Research Program of Frontier Sciences of CAS (No. ZDBS-LY-SLH010).
| [1] |
ITER Physics Basis Editors 1999 Nucl. Fusion 39 2137 doi: 10.1088/0029-5515/39/12/301
|
| [2] |
Shimada M et al 2007 Nucl. Fusion 47 S1 doi: 10.1088/0029-5515/47/6/S01
|
| [3] |
Reimold F et al 2015 Nucl. Fusion 55 033004 doi: 10.1088/0029-5515/55/3/033004
|
| [4] |
Leonard A W et al 2017 Nucl. Fusion 57 086033 doi: 10.1088/1741-4326/aa778c
|
| [5] |
Guo H Y et al 2019 Nucl. Fusion 59 086054 doi: 10.1088/1741-4326/ab26ee
|
| [6] |
Huber A et al 2013 J. Nucl. Mater. 438 S139 doi: 10.1016/j.jnucmat.2013.01.022
|
| [7] |
Field A R et al 2017 Plasma Phys. Control. Fusion 59 095003 doi: 10.1088/1361-6587/aa764c
|
| [8] |
Asakura N et al 1996 Nucl. Fusion 36 795 doi: 10.1088/0029-5515/36/6/I10
|
| [9] |
Theiler C et al 2017 Nucl. Fusion 57 072008 doi: 10.1088/1741-4326/aa5fb7
|
| [10] |
Yan L W et al 2009 J. Nucl. Mater. 390–391 246 doi: 10.1016/j.jnucmat.2009.01.075
|
| [11] |
Liu J B et al 2019 Nucl. Fusion 59 126046 doi: 10.1088/1741-4326/ab4639
|
| [12] |
Meng L Y et al 2020 Plasma Phys. Control. Fusion 62 065008 doi: 10.1088/1361-6587/ab877f
|
| [13] |
Wischmeier M et al 2003 J. Nucl. Mater. 313–316 980 doi: 10.1016/S0022-3115(02)01427-7
|
| [14] |
Pitts R A et al 2003 J. Nucl. Mater. 313–316 777 doi: 10.1016/S0022-3115(02)01429-0
|
| [15] |
Canik J M et al 2017 Phys. Plasmas 24 056116 doi: 10.1063/1.4982057
|
| [16] |
Wan B N et al 2019 Nucl. Fusion 59 112003 doi: 10.1088/1741-4326/ab0396
|
| [17] |
Guo H Y et al 2014 Nucl. Fusion 54 013002 doi: 10.1088/0029-5515/54/1/013002
|
| [18] |
Zhang B et al 2020 Nucl. Fusion 60 092001 doi: 10.1088/1741-4326/ab9be6
|
| [19] |
Xu J C et al 2016 Rev. Sci. Instrum. 87 083504 doi: 10.1063/1.4960181
|
| [20] |
Xu J C et al 2018 IEEE Trans. Plasma Sci. 46 1331 doi: 10.1109/TPS.2018.2794533
|
| [21] |
Zhang B et al 2015 Plasma Sci. Technol. 17 831 doi: 10.1088/1009-0630/17/10/04
|
| [22] |
Duan Y M et al 2011 Plasma Sci. Technol. 13 546 doi: 10.1088/1009-0630/13/5/07
|
| [23] |
Zhang L et al 2015 Rev. Sci. Instrum. 86 123509 doi: 10.1063/1.4937723
|
| [24] |
Mao H M et al 2017 Rev. Sci. Instrum. 88 043502 doi: 10.1063/1.4979406
|
| [25] |
Zhang S B et al 2014 Plasma Sci. Technol. 16 311 doi: 10.1088/1009-0630/16/4/02
|
| [26] |
Han X et al 2014 Rev. Sci. Instrum. 85 073506 doi: 10.1063/1.4891040
|
| [27] |
Wan B N et al 2022 Nucl. Fusion 62 042010 doi: 10.1088/1741-4326/ac2993
|
| [28] |
Loarte A et al 1998 Nucl. Fusion 38 331 doi: 10.1088/0029-5515/38/3/303
|
| [29] |
Mayer M et al 2009 J. Nucl. Mater. 390–391 538 doi: 10.1016/j.jnucmat.2009.01.087
|
| [30] |
Ryter F et al 2013 Nucl. Fusion 53 113003 doi: 10.1088/0029-5515/53/11/113003
|
| [31] |
Wang H Q et al 2021 Phys. Plasmas 28 052507 doi: 10.1063/5.0048428
|
| [32] |
Li K D et al 2021 Nucl. Mater. Energy 26 100867 doi: 10.1016/j.nme.2020.100867
|
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