Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak
文献类型：期刊论文
| 作者 | Idei, H.2; Onchi, T.2; Mishra, K.1,3; Zushi, H.2; Kariya, T.4; Imai, T.4; Watanabe, O.2; Ikezoe, R.2; Hanada, K.2; Ono, M.5 |
| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2020 |
| 卷号 | 60 |
| ISSN号 | 0029-5515 |
| 关键词 | spherical tokamak electron cyclotron heating and current drive electron Bernstein wave heating and current drive non-inductive plasma startup |
| DOI | 10.1088/1741-4326/ab4c12 |
| 通讯作者 | Idei, H.(idei@triam.kyushu-u.ac.jp) |
| 英文摘要 | A 28 GHz system with a high-power gyrotron tube has been used for the QUEST spherical tokamak to form an over-dense plasma for electron Bernstein wave (EBW) heating and current drive with an 8.2 GHz-wave. Non-inductive high-density plasma ramp-up experiments with dual-frequency (dual-f) electron cyclotron (EC) (8.2 GHz and 28 GHz) waves were conducted. A spontaneous density jump (SDJ) to an over-dense state was first observed as a bifurcation phenomenon in the dual-f wave experiment. The over-dense plasma on the 8.2 GHz wave was non-inductively ramped up to 25 kA, and was maintained for 0.4 s under stable plasma equilibrium after two such jumps in one shot. Heating to mildly energetic electrons and bulk electrons was observed even in the over-dense region. The electrostatic EBW heating effect on the mildly energetic electrons in the over-dense region is assessed following a dispersion analysis of the 8.2 GHz wave. The bulk electron heating effect observed is explained as heat exchange from mildly energetic electrons heated by the electrostatic EBW. Remarkably, a high hard-x-ray-radiation temperature of similar to 500 keV was also observed in tangential viewing for current-carrying electrons in the over-dense core region. Synergetic heating from the overlap of different 28 GHz EC harmonic resonances as well as higher harmonic heating is discussed for maintaining the highly energetic electrons in the over-dense core region. In addition, the SDJ process and mechanism are considered based on the discussion of the electron heating effects with the 8.2 GHz wave. |
| WOS关键词 | CURRENT DRIVE ; SYSTEM |
| 资助项目 | NIFS Collaboration Research Programs[NIFS09KUTR046/NIFS10KUTR048/NIFS11KUTR059/NIFS11KUTR069] ; Ministry of Education, Science, Sports and Culture[15H04231] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000529973000001 |
| 资助机构 | NIFS Collaboration Research Programs ; Ministry of Education, Science, Sports and Culture |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/103461]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Idei, H. |
| 作者单位 | 1.Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Kasuga, Fukuoka 8168580, Japan 2.Kyushu Univ, Res Inst Appl Mech, Kasuga, Fukuoka 8168580, Japan 3.Inst Plasma Res, Gandhinagar 382428, India 4.Univ Tsukuba, Plasma Res Ctr, Tsukuba, Ibaraki 3058577, Japan 5.Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA 6.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 7.Univ Tokyo, Dept Complex Sci & Engn, Kashiwa, Chiba 2778561, Japan 8.Kyoto Univ, Dept Nucl Engn, Kyoto 6158540, Japan 9.Natl Inst Fus Sci, Toki, Gifu 5095292, Japan 10.Natl Inst Quantum & Radiol Sci & Tech, Naka, Ibaraki 3110193, Japan |
| 推荐引用方式 GB/T 7714 | Idei, H.,Onchi, T.,Mishra, K.,et al. Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak[J]. NUCLEAR FUSION,2020,60. |
| APA | Idei, H..,Onchi, T..,Mishra, K..,Zushi, H..,Kariya, T..,...&Murakami, S..(2020).Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak.NUCLEAR FUSION,60. |
| MLA | Idei, H.,et al."Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak".NUCLEAR FUSION 60(2020). |
入库方式： OAI收割
来源：合肥物质科学研究院
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