Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST

doi:10.1016/j.net.2022.06.003

	Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST
	Wang, M.1; Liu, L.1; Zhao, L. M.1; Li, M. H.1; Ma, W. D.1; Hu, H. C.1; Wu, Z. G.1; Feng, J. Q.1; Yang, Y.1; Zhu, L.1
刊名	NUCLEAR ENGINEERING AND TECHNOLOGY
	2022-11-01
卷号	54
关键词	Lower hybrid current drive Hot spots Fast electrons Long -pulse operation Tokamak
ISSN号	1738-5733
DOI	10.1016/j.net.2022.06.003
通讯作者	Li, M. H.(mhli@ipp.ac.cn)
英文摘要	Aiming at high-power and long-pulse operation up to 1000 s, some improvements have been made for both 2.45 GHz and 4.6 GHz lower hybrid (LH) systems during the recent 5 years. At first, the guard limiters of the LH antennas with graphite tiles were upgraded to tungsten, the most promising material for plasma facing components in nuclear fusion devices. These new guard limiters can operate at a peak power density of 12.9 MW/m2. Strong hot spots were usually observed on the old graphite limiters when 4.6 GHz system operated with power >2.0 MW [B. N. Wan et al., Nucl. Fusion 57 (2017) 102019], leading to a reduction of the maximum power capability. With the new limiters, 4.6 GHz LH system, the main current drive (CD) and electron heating tool for EAST, can be operated with power >2.5 MW routinely. Long-pulse operation up to 100 s with 4.6 GHz LH power of 2.4 MW was achieved in 2021 and the maximal temperature on the guard limiters measured by an infrared (IR) camera was about 540 degrees C, much below the permissible value of tungsten material (-1200 degrees C). A discharge with a duration of 1056 s was achieved and the 4.6 GHz LH energy injected into the plasma was up to 1.05 GJ. Secondly, the fully-active-multijunction (FAM) launcher of 2.45 GHz system was upgraded to a passive-active-multijunction (PAM), for which the density of optimum coupling was relatively low (below the cut-off value). Good coupling with reflection coefficient-3% has been achieved with plasma-antenna distance up to 11 cm for the new PAM. Finally, in order to eliminate the effect of ion cyclotron range of frequencies (ICRF) wave on 4.6 GHz LH wave coupling, the location of the ICRF launcher was changed to a port that is located 157.5 degrees toroidally from the 4.6 GHz LH system and is not magnetically connected.(c) 2022 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
资助项目	Performance Improvement Project of EAST, Hefei Comprehensive National Science Center ; National Natural Science Foundation of China[11775259] ; National Natural Science Foundation of China[11805233] ; National Natural Science Foundation of China[11675214] ; National Natural Science Foundation of China[11175206] ; National Natural Science Foundation of China[11275233] ; National Mag- netic Confinement Fusion Science Program of China[2015GB102003] ; Comprehensive Research Facility for Fusion Technology Program of China[2018-000052-73-01-001228]
WOS关键词	DENSITY CONVECTION ; STEADY-STATE ; TORE-SUPRA ; PLASMA ; PERFORMANCE ; DIVERTOR
WOS研究方向	Nuclear Science & Technology
语种	英语
出版者	KOREAN NUCLEAR SOC
WOS记录号	WOS:000885455900003
资助机构	Performance Improvement Project of EAST, Hefei Comprehensive National Science Center ; National Natural Science Foundation of China ; National Mag- netic Confinement Fusion Science Program of China ; Comprehensive Research Facility for Fusion Technology Program of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/131700]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, M. H.
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.CEA, IRFM, St Paul Les Durance, France
推荐引用方式 GB/T 7714	Wang, M.,Liu, L.,Zhao, L. M.,et al. Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST[J]. NUCLEAR ENGINEERING AND TECHNOLOGY,2022,54.
APA	Wang, M..,Liu, L..,Zhao, L. M..,Li, M. H..,Ma, W. D..,...&Delpech, L..(2022).Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST.NUCLEAR ENGINEERING AND TECHNOLOGY,54.
MLA	Wang, M.,et al."Improvement of lower hybrid current drive systems for high-power and long-pulse operation on EAST".NUCLEAR ENGINEERING AND TECHNOLOGY 54(2022).