Experimental investigation of PDI bifurcation of lower hybrid waves during electron density ramp-up in EAST
文献类型：期刊论文
| 作者 | Yan, G. H.2,3; Ding, B. J.2 ; Wu, C. B.2; Li, M. H.2; Baek, S. G.4; Napoli, F.1; Zhou, T. T.2,3; Geng, K. N.2; Yan, N.2; Wang, M.2
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| 刊名 | NUCLEAR FUSION
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| 出版日期 | 2024-08-01 |
| 卷号 | 64 |
| 关键词 | lower hybrid (LH) waves lower hybrid current drive (LHCD) parametric decay instability (PDI) |
| ISSN号 | 0029-5515 |
| DOI | 10.1088/1741-4326/ad4fa0 |
| 通讯作者 | Ding, B. J.(bjding@ipp.ac.cn) ; Wu, C. B.(chbwu@ipp.ac.cn) |
| 英文摘要 | The effect of parametric decay instability (PDI) on the current drive efficiency of 4.6 GHz lower hybrid (LH) waves in EAST is investigated experimentally, showing the PDI channel bifurcation of LH waves for the first time in EAST. First, experiments with three platforms of LH power were performed, achieving the LH power required for the PDI occurrence. Second, PDI bifurcation experiments were further carried out by ramping up the plasma electron density. The loop voltage increases with an increase in density, implying a decrease in the current driven by the LH wave. PDI bifurcation during electron density ramp-up was studied by analyzing the parallel refractive index ( n parallel to ) and the frequency spectrum broadening, which is measured with a radio frequency magnetic probe array recently installed close to the LH antenna. It is observed for the first time that they both first increase with density, then there is not much variation and a clear sideband in the frequency spectrum is also observed when the density is up to 4 x 10 19 m - 3 , suggesting a change in the PDI channel. Calculation of the mode growth rate driven by PDI shows that when the edge electron density is up to 1.9 x 10 18 m - 3 , the growth rate of the ion cyclotron quasi-mode (ICQM) will exceed that of the ion sound quasi-mode (ISQM), quantitively explaining that with an increase in density, the PDI channel partly transits from the ISQM to the ICQM channel. Studies provide a possible way to reduce the power deposition in the edge region and improve drive capability by means of mitigating PDI behavior. |
| WOS关键词 | CURRENT DRIVE ; PARAMETRIC-INSTABILITY ; PLASMA |
| 资助项目 | CAS HFIPS Director's Fund ; National Natural Science Foundation of China[11975266] ; National Natural Science Foundation of China[11775259] ; National Natural Science Foundation of China[12305253] ; US Department of Energy ; [YZJJ2023QN24] ; [DE-SC0010492] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001250767000001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | CAS HFIPS Director's Fund ; National Natural Science Foundation of China ; US Department of Energy |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/136445]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Ding, B. J.; Wu, C. B. |
| 作者单位 | 1.ENEA, Fus & Nucl Safety Dept, Frascati, Italy 2.Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Peoples R China 4.MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA |
| 推荐引用方式 GB/T 7714 | Yan, G. H.,Ding, B. J.,Wu, C. B.,et al. Experimental investigation of PDI bifurcation of lower hybrid waves during electron density ramp-up in EAST[J]. NUCLEAR FUSION,2024,64. |
| APA | Yan, G. H..,Ding, B. J..,Wu, C. B..,Li, M. H..,Baek, S. G..,...&Ma, W. Q..(2024).Experimental investigation of PDI bifurcation of lower hybrid waves during electron density ramp-up in EAST.NUCLEAR FUSION,64. |
| MLA | Yan, G. H.,et al."Experimental investigation of PDI bifurcation of lower hybrid waves during electron density ramp-up in EAST".NUCLEAR FUSION 64(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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