Error analysis and cazlibration of Langmuir probes embedded in ITER-like tungsten divertor on EAST

doi:10.1016/j.nme.2021.100996

	Error analysis and cazlibration of Langmuir probes embedded in ITER-like tungsten divertor on EAST
	Meng, L. Y.1,3; Xu, J. C.2; Liu, J. B.3; Wang, L.3; Qian, X. Y.3; Chen, L.3; Liu, X.3; Xu, G. S.3; Liang, R. R.1,3; Huang, J.1,3
刊名	NUCLEAR MATERIALS AND ENERGY
	2021-06-01
卷号	27
关键词	Langmuir probe Ablation Error analysis Calibration EAST tokamak
DOI	10.1016/j.nme.2021.100996
通讯作者	Liu, J. B.(jianbinliu@ipp.ac.cn) ; Wang, L.(lwang@ipp.ac.cn)
英文摘要	The divertor Langmuir probes (Div-LPs) system is a key diagnostic for measuring divertor plasma parameters in tokamaks. The accuracy of the measurement is the basis of physical researches. However, the excessive heat load on the target plates may lead to serious ablation of graphite probe tips, especially during long-pulse operation or unmitigated disruptions. In order to evaluate the data uncertainty caused by ablation, a statistical study has been made based on the Ohmic discharges in the EAST (Experimental Advanced Superconducting Tokamak) 2018 experiment campaign. The results show that for the discharges with the same plasma parameters, the peak particle flux of upper outer divertor measured by Div-LPs becomes several times smaller as the discharge progresses in a long experimental campaign, which is mainly due to that the effective collection area of the ablated probe tip becomes smaller and smaller. To quantitatively calculate the decrease of the effective area of the probe tip, the physical quantity of accumulated injection energy is introduced. A simple model is proposed and used to characterize the relationship between the effective collection area and the total accumulated injection energy. In addition, arbitrary H-mode discharges are selected to verify the model. By comparing the calibrated data of DivLPs with other diagnostics, it is found that the model is also suitable for H-mode discharges with the strike point near the frequently-used-SP, and thereby the uncertainty after calibration is significantly reduced. In the future, the method will be employed for Div-LPs data processing near the strike point on EAST, which will facilitate further researches on divertor physics.
资助项目	National Key R&D Program of China[2017YFE0301300] ; National Key R&D Program of China[2017YFA0402500] ; Institute of Energy, Hefei Comprehensive National Science Center[GXXT-2020-004] ; National Natural Science Foundation of China[11922513] ; National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11805238] ; National Natural Science Foundation of China[11905255] ; National Natural Science Foundation of China[12005004] ; AHNSF[1808085J07] ; AHNSF[2008085QA38] ; CASHIPS Director's Fund[YZJJ2020QN13] ; EAST team
WOS关键词	TOKAMAKS ; SYSTEM
WOS研究方向	Nuclear Science & Technology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000670923000001
资助机构	National Key R&D Program of China ; Institute of Energy, Hefei Comprehensive National Science Center ; National Natural Science Foundation of China ; AHNSF ; CASHIPS Director's Fund ; EAST team
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123556]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, J. B.; Wang, L.
作者单位	1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Anhui Univ Sci & Technol, Sch Mech Engn, Huainan 232001, Peoples R China 3.Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Meng, L. Y.,Xu, J. C.,Liu, J. B.,et al. Error analysis and cazlibration of Langmuir probes embedded in ITER-like tungsten divertor on EAST[J]. NUCLEAR MATERIALS AND ENERGY,2021,27.
APA	Meng, L. Y..,Xu, J. C..,Liu, J. B..,Wang, L..,Qian, X. Y..,...&Wang, Y. M..(2021).Error analysis and cazlibration of Langmuir probes embedded in ITER-like tungsten divertor on EAST.NUCLEAR MATERIALS AND ENERGY,27.
MLA	Meng, L. Y.,et al."Error analysis and cazlibration of Langmuir probes embedded in ITER-like tungsten divertor on EAST".NUCLEAR MATERIALS AND ENERGY 27(2021).