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| Observation and analysis of lower-hybrid-current-drive density limit in EAST | |
Li, M. H.1; Baek, S. G.2; Wallace, G. M.2; Ding, B. J.1 ; Wu, C. B.1; Yan, G. H.1; Bonoli, P. T.2; Wang, M.1; Liu, L.1; Zhao, L. M.1; Wu, Z. G.1; Yang, H.1; Lin, S. Y.1; Zang, Q.1; Yan, N.1; Zhao, H. L.1; Huang, J.1; Zhai, X. M.1; Li, X. X.3; Zhang, X. J.1; Gong, X. Z.1
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| 2022-12-01 | |
| Source Publication | NUCLEAR FUSION
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| ISSN | 0029-5515 |
| Corresponding Author | Ding, B. J.(bjding@ipp.ac.cn) ; Wang, M.(mwang@ipp.ac.cn) |
| Abstract | Lower hybrid current drive (LHCD) experiments with line-averaged density up to similar to 5.1 x 10(19) m(-3) were performed in EAST L-mode plasmas. When the line-averaged density rises above a critical value, the hard x-ray (HXR) emission falls to the noise level, indicating that the LHCD density limit is encountered. The experimental results show that the LHCD density limit can be increased with higher wave source frequency (f (0)) and higher magnetic field (B (t)). Although a higher LHCD density limit is obtained by a higher magnetic field for both 2.45 GHz and 4.6 GHz waves, the results show a stronger dependence on the magnetic field for the 4.6 GHz case. Analysis suggests that, for normal operation with a relatively low magnetic field (1.6 T <= B (t) <= 2.5 T) on EAST, the dominant mechanisms responsible for the LHCD density limit are different between the 2.45 GHz and 4.6 GHz waves. The wave accessibility plays a more significant role during 4.6 GHz LHCD experiments, while parasitic losses due to parametric decay instability (PDIs) dominate the accessibility issue in the 2.45 GHz case. Collisional loss in the scrape-off layer (SOL) may explain the 4.6 GHz result when combined with the accessibility limit at high density and low temperature. |
| Keyword | lower hybrid current drive current drive efficiency density limit parametric decay instability wave accessibility |
| DOI | 10.1088/1741-4326/ac99ed |
| WOS Keyword | PARAMETRIC-INSTABILITIES ; PROFILE CONTROL ; EFFICIENCY ; WAVES ; RANGE |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[11775259] ; National Natural Science Foundation of China[11975266] ; National Natural Science Foundation of China[11805233] ; National Natural Science Foundation of China[11975276] ; Comprehensive Research Facility for Fusion Technology Program of China[2018-000052-73-01-001228] ; Anhui Provincial Natural Science Foundation[2008085J04] ; US Department of Energy[DE-SC0010492] |
| Funding Organization | National Natural Science Foundation of China ; Comprehensive Research Facility for Fusion Technology Program of China ; Anhui Provincial Natural Science Foundation ; US Department of Energy |
| WOS Research Area | Physics |
| WOS Subject | Physics, Fluids & Plasmas |
| WOS ID | WOS:000880827400001 |
| Publisher | IOP Publishing Ltd |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.hfcas.ac.cn:8080/handle/334002/130117 |
| Collection | 中国科学院合肥物质科学研究院 |
| Corresponding Author | Ding, B. J.; Wang, M. |
| Affiliation | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA 3.Univ South China, Dept Nucl Phys, Hengyang 421001, Peoples R China |
| First Author Affilication | Chinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China |
| Corresponding Author Affilication | Chinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China |
| Recommended Citation GB/T 7714 | Li, M. H.,Baek, S. G.,Wallace, G. M.,et al. Observation and analysis of lower-hybrid-current-drive density limit in EAST[J]. NUCLEAR FUSION,2022,62. |
| APA | Li, M. H..,Baek, S. G..,Wallace, G. M..,Ding, B. J..,Wu, C. B..,...&Gong, X. Z..(2022).Observation and analysis of lower-hybrid-current-drive density limit in EAST.NUCLEAR FUSION,62. |
| MLA | Li, M. H.,et al."Observation and analysis of lower-hybrid-current-drive density limit in EAST".NUCLEAR FUSION 62(2022). |
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