Experimental study of the influence of gas puff locations on H-mode boundary plasmas with argon seeding on EAST

He, Tao; Yang, Zhongshi; Wang, Liang; Li, Kedong; Wang, Huiqian; Eldon, David; Hyatt, Alan; Humphreys, David; Meng, Lingyi; Ding, Fang; Wang, Yuming; Duan, Yanmin; Zhang, Ling; Xu, Jichan; Luo, Yu; Ye, Dawei; Chen, Xiahua; Yang, Qingquan; Nian, Feifei; Niu, Guojian; Xu, Guosheng; Luo, Guang-Nan

doi:10.1088/1361-6587/ac0354

Title: Experimental study of the influence of gas puff locations on H-mode boundary plasmas with argon seeding on EAST

Journal Article · Tue Jun 08 00:00:00 EDT 2021 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac0354· OSTI ID:1829009

^[1]; Yang, Zhongshi ^[2];

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^[3]; Hyatt, Alan ^[3]; Humphreys, David ^[3];

^[1]; Ding, Fang ^[2]; Wang, Yuming ^[2]; Duan, Yanmin ^[2]; Zhang, Ling ^[2];

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^[1]; Niu, Guojian ^[2] more »

Chinese Academy of Sciences, Anhui (China); Univ. of Science and Technology of China, Anhui (China)
Chinese Academy of Sciences, Anhui (China)
General Atomics, San Diego, CA (United States)
Anhui Univ. of Science and Technology, Huainan (China)

To investigate the optimal scenario of impurity seeding to obtain divertor plasma detachment for target protection, experiments with Ar&D₂ seeding from two different poloidal locations, the upper outer (UO) divertor target and lower outer (LO) target, were carried out on EAST. Partial energy detachment (the electron temperature near the strike point T_e,spt ≤ 10 eV) were obtained with Ar&D₂ mixture puffing from the UO target and, for the first time, from the LO target into H-mode plasmas in the upper single null (USN) configuration. The peak heat flux q_t on the UO target was significantly reduced (by ~80%). The rollover of ion flux density j_s did not appear probably due to insufficient momentum loss, which is independent of the puff locations. The poloidal asymmetries of particle and heat fluxes on the targets have also been investigated. The UO-dominant asymmetry of particle flux was reversed, while the UO-dominant asymmetry of heat flux was mitigated but not reversed. The plasma confinement dropped by only 14% and 8.2% in the LO-puff case and UO-puff case, respectively, during detachment. The high level of C may contributed greatly to the higher radiation in the bulk plasma region and the greater decline in W_MHD in the LO-puff case.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Anhui Provincial Natural Science Foundation

Grant/Contract Number:: SC0010685; 2018YFE0303103; 2017YFE0301300; 11875287; 11922513

OSTI ID:: 1829009

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 63, Issue 8; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (42)

Impact of nitrogen seeding on confinement and power load control of a high-triangularity JET ELMy H-mode plasma with a metal wall Giroud, C.; Maddison, G. P.; Jachmich, S. Nuclear Fusion, Vol. 53, Issue 11 https://doi.org/10.1088/0029-5515/53/11/113025	journal	September 2013
Improved density measurement by FIR laser interferometer on EAST tokamak Shen, Jie; Jie, Yinxian; Liu, Haiqing Fusion Engineering and Design, Vol. 88, Issue 11 https://doi.org/10.1016/j.fusengdes.2013.05.009	journal	November 2013
Modeling study of radiation characteristics with different impurity species seeding in EAST Liu, X. J.; Deng, G. Z.; Wang, L. Physics of Plasmas, Vol. 24, Issue 12 https://doi.org/10.1063/1.4997101	journal	December 2017
The impact of neon-seeding location on the divertor plasma in EAST Liu, Daoyuan; Sang, Chaofeng; Wang, Liang Fusion Engineering and Design, Vol. 136 https://doi.org/10.1016/j.fusengdes.2018.02.018	journal	November 2018
Divertor asymmetry and scrape-off layer flow in various divertor configurations in Experimental Advanced Superconducting Tokamak Liu, S. C.; Guo, H. Y.; Xu, G. S. Physics of Plasmas, Vol. 19, Issue 4 https://doi.org/10.1063/1.4707396	journal	April 2012
Upgrade of Langmuir probe diagnostic in ITER-like tungsten mono-block divertor on experimental advanced superconducting tokamak Xu, J. C.; Wang, L.; Xu, G. S. Review of Scientific Instruments, Vol. 87, Issue 8 https://doi.org/10.1063/1.4960181	journal	August 2016
Driving mechanism of sol plasma flow and effects on the divertor performance in JT-60U Asakura, N.; Takenaga, H.; Sakurai, S. Nuclear Fusion, Vol. 44, Issue 4 https://doi.org/10.1088/0029-5515/44/4/004	journal	March 2004
Active control of divertor asymmetry on EAST by localized D2 and Ar puffing Wang, Dongsheng; Guo, Houyang; Wang, Huiqian Physics of Plasmas, Vol. 18, Issue 3 https://doi.org/10.1063/1.3564962	journal	March 2011
Basic physical processes and reduced models for plasma detachment Stangeby, P. C. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaacf6	journal	March 2018
Advances in H-mode physics for long-pulse operation on EAST Wan, Baonian; Li, Jiangang; Guo, Houyang Nuclear Fusion, Vol. 55, Issue 10 https://doi.org/10.1088/0029-5515/55/10/104015	journal	July 2015
Comparison of radiating divertor behaviour in single-null and double-null plasmas in DIII-D Petrie, T. W.; Brooks, N. H.; Fenstermacher, M. E. Nuclear Fusion, Vol. 48, Issue 4 https://doi.org/10.1088/0029-5515/48/4/045010	journal	March 2008
Impurity enrichment and radiative enhancement using induced SOL flow in DIII-D West, W. P.; Brooks, N. H.; Jackson, G. L. Journal of Nuclear Materials, Vol. 266-269 https://doi.org/10.1016/S0022-3115(98)00813-7	journal	March 1999
Control of divertor heat load by Ar injection with keeping high performance in ELMy H-mode plasmas on JT-60U Higashijima, S.; Asakura, N.; Kubo, H. Journal of Nuclear Materials, Vol. 313-316 https://doi.org/10.1016/S0022-3115(02)01502-7	journal	March 2003
Effect of N2, Ne and Ar seeding on Alcator C-Mod H-mode confinement Reinke, M. L.; Hughes, J. W.; Loarte, A. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.10.055	journal	August 2011
Divertor studies in nitrogen induced completely detached H-modes in full tungsten ASDEX Upgrade Reimold, F.; Wischmeier, M.; Bernert, M. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033004	journal	February 2015
Comparison of divertor behavior and plasma confinement between argon and neon seeding in EAST Li, Kedong; Yang, Zhongshi; Wang, Huiqian Nuclear Fusion, Vol. 61, Issue 6 https://doi.org/10.1088/1741-4326/abf418	journal	April 2021
In–out asymmetry of divertor particle flux in H-mode with edge localized modes on EAST Liu, J. B.; Guo, H. Y.; Wang, L. Nuclear Fusion, Vol. 56, Issue 6 https://doi.org/10.1088/0029-5515/56/6/066006	journal	May 2016
Physics basis for the first ITER tungsten divertor Pitts, R. A.; Bonnin, X.; Escourbiac, F. Nuclear Materials and Energy, Vol. 20 https://doi.org/10.1016/j.nme.2019.100696	journal	August 2019
Confinement of ‘improved H-modes’ in the all-tungsten ASDEX Upgrade with nitrogen seeding Schweinzer, J.; Sips, A. C. C.; Tardini, G. Nuclear Fusion, Vol. 51, Issue 11 https://doi.org/10.1088/0029-5515/51/11/113003	journal	September 2011
Contrasting H-mode behaviour with deuterium fuelling and nitrogen seeding in the all-carbon and metallic versions of JET Maddison, G. P.; Giroud, C.; Alper, B. Nuclear Fusion, Vol. 54, Issue 7 https://doi.org/10.1088/0029-5515/54/7/073016	journal	May 2014
Geometry and Physics Design of Lower Divertor Upgrade in EAST Xu, Houchang; Yao, Damao; Zhou, Zibo IEEE Transactions on Plasma Science, Vol. 46, Issue 5 https://doi.org/10.1109/TPS.2018.2815034	journal	May 2018
Investigation of the effects of impurity seeding under different magnetic configurations in L-mode plasma in EAST tokamak Xiang, Lingyan; Guo, Houyang; Wischmeier, Marco Physics of Plasmas, Vol. 24, Issue 9 https://doi.org/10.1063/1.5001723	journal	September 2017
A space-resolved extreme ultraviolet spectrometer for radial profile measurement of tungsten ions in the Experimental Advanced Superconducting Tokamak Zhang, Ling; Morita, Shigeru; Wu, Zhenwei Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 916 https://doi.org/10.1016/j.nima.2018.11.082	journal	February 2019
Power exhaust by SOL and pedestal radiation at ASDEX Upgrade and JET Bernert, M.; Wischmeier, M.; Huber, A. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.12.029	journal	August 2017
High confinement/high radiated power H-mode experiments in Alcator C-Mod and consequences for International Thermonuclear Experimental Reactor (ITER) Q _DT = 10 operation Loarte, A.; Hughes, J. W.; Reinke, M. L. Physics of Plasmas, Vol. 18, Issue 5 https://doi.org/10.1063/1.3567547	journal	May 2011
Achievement of radiative feedback control for long-pulse operation on EAST Wu, K.; Yuan, Q. P.; Xiao, B. J. Nuclear Fusion, Vol. 58, Issue 5 https://doi.org/10.1088/1741-4326/aab506	journal	March 2018
Impurity feedback control for enhanced divertor and edge radiation in DIII-D discharges Jackson, G. Journal of Nuclear Materials, Vol. 241-243, Issue 1 https://doi.org/10.1016/S0022-3115(96)00575-2	journal	February 1997
Radiation distribution and energy loss during ELM in EAST Duan, Y. M.; Hu, L. Q.; Chen, K. Y. Journal of Nuclear Materials, Vol. 438 https://doi.org/10.1016/j.jnucmat.2013.01.063	journal	July 2013
On the asymmetries of ELM divertor power deposition in JET and ASDEX Upgrade Eich, T.; Kallenbach, A.; Fundamenski, W. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.202	journal	June 2009
Radiation and spectroscopy analysis of divertor discharges with neon gas puff in JT-60U Ishijima, T.; Kubo, H.; Shimada, M. Plasma Physics and Controlled Fusion, Vol. 41, Issue 9 https://doi.org/10.1088/0741-3335/41/9/307	journal	August 1999
First Evidence of Local $E \times B$ Drift in the Divertor Influencing the Structure and Stability of Confined Plasma near the Edge of Fusion Devices Wang, H. Q.; Guo, H. Y.; Xu, G. S. Physical Review Letters, Vol. 124, Issue 19 https://doi.org/10.1103/PhysRevLett.124.195002	journal	May 2020
Divertor impurity seeding with a new feedback control scheme for maintaining good core confinement in grassy-ELM H-mode regime with tungsten monoblock divertor in EAST Xu, G. S.; Yuan, Q. P.; Li, K. D. Nuclear Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1741-4326/ab91fa	journal	July 2020
A multichannel visible spectroscopy system for the ITER-like W divertor on EAST Mao, Hongmin; Ding, Fang; Luo, Guang-Nan Review of Scientific Instruments, Vol. 88, Issue 4 https://doi.org/10.1063/1.4979406	journal	April 2017
A fast-time-response extreme ultraviolet spectrometer for measurement of impurity line emissions in the Experimental Advanced Superconducting Tokamak Zhang, Ling; Morita, Shigeru; Xu, Zong Review of Scientific Instruments, Vol. 86, Issue 12 https://doi.org/10.1063/1.4937723	journal	December 2015
Development of the W-band density profile and fluctuation reflectometer on EAST Wang, Y. M.; Gao, X.; Ling, B. L. Fusion Engineering and Design, Vol. 88, Issue 11 https://doi.org/10.1016/j.fusengdes.2013.06.004	journal	November 2013
Investigation of multifaceted asymmetric radiation from the edge (MARFE) with impurity injection from the upper divertor on the Experimental Advanced Superconducting Tokamak Luo, Yu; Ding, Fang; Wang, Liang Plasma Physics and Controlled Fusion, Vol. 62, Issue 7 https://doi.org/10.1088/1361-6587/ab8a62	journal	May 2020
Effects of carbon impurities on the power radiation and tungsten target erosion in EAST Sang, Chaofeng; Ding, Rui; Bonnin, Xavier Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5038848	journal	July 2018
Divertor power load feedback with nitrogen seeding in ASDEX Upgrade Kallenbach, A.; Dux, R.; Fuchs, J. C. Plasma Physics and Controlled Fusion, Vol. 52, Issue 5 https://doi.org/10.1088/0741-3335/52/5/055002	journal	March 2010
A review on impurity transport in divertors Shimizu, K. Journal of Nuclear Materials, Vol. 241-243, Issue 1 https://doi.org/10.1016/S0022-3115(96)00503-X	journal	February 1997
First experimental tests of a new small angle slot divertor on DIII-D Guo, H. Y.; Wang, H. Q.; Watkins, J. G. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab26ee	journal	July 2019
Evidence for volume recombination in JET detached divertor plasmas McCracken, G. M.; Stamp, M. F.; Monk, R. D. Nuclear Fusion, Vol. 38, Issue 4 https://doi.org/10.1088/0029-5515/38/4/311	journal	April 1998
Advances in plasma–wall interaction control for H-mode operation over 100 s with ITER-like tungsten divertor on EAST Wang, L.; Guo, H. Y.; Ding, F. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab1ed4	journal	July 2019

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Title: Experimental study of the influence of gas puff locations on H-mode boundary plasmas with argon seeding on EAST

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