Dynamics of L-H transition and I-phase in EAST
文献类型：期刊论文
| 作者 | Xu, G. S.1; Wang, H. Q.1; Xu, M.2; Wan, B. N.1; Guo, H. Y.1; Diamond, P. H.3,4; Tynan, G. R.3; Chen, R.1; Yan, N.1,6; Kong, D. F.1 |
| 刊名 | NUCLEAR FUSION
 |
| 出版日期 | 2014-10-01 |
| 卷号 | 54页码:21 |
| ISSN号 | 0029-5515 |
| 关键词 | L-H transition I-phase reciprocating probe zonal flows Reynolds stress |
| DOI | 10.1088/0029-5515/54/10/103002 |
| 英文摘要 | The turbulence and flows at the plasma edge during the L-I-H, L-I-L and single-step L-H transitions have been measured directly using two reciprocating Langmuir probe systems at the outer midplane with several newly designed probe arrays in the EAST superconducting tokamak. The E x B velocity, turbulence level and turbulent Reynolds stress at similar to 1 cm inside the separatrix ramp-up in the last similar to 20 ms preceding the single-step L-H transition, but remain nearly constant near the separatrix, indicating an increase in the radial gradients at the plasma edge. The kinetic energy transfer rate from the edge turbulence to the E x B flows is significantly enhanced only in the last similar to 10 ms and peaks just prior to the L-H transition. The E x B velocity measured inside the separatrix, which is typically in the electron diamagnetic drift direction in the L-mode, decays towards the ion diamagnetic drift direction in response to fluctuation suppression at the onset of the single-step L-H, L-I-L as well as L-I-H transitions. One important distinction between the L-I-H and the L-I-L transitions has been observed, with respect to the evolution of the edge pressure gradient and mean E x B flow during the I-phase. Both of them ramp up gradually during the L-I-H transition, but change little during the L-I-L transition, which may indicate that a gradual buildup of the edge pedestal and mean E x B flow during the I-phase leads to the final transition into the H-mode. In addition, the transition data in EAST strongly suggest that the divertor pumping capability is an important ingredient in determining the transition behaviour and power threshold. |
| WOS关键词 | EDGE LOCALIZED MODES ; DIII-D TOKAMAK ; STELLARATOR W7-AS ; ASDEX UPGRADE ; BEHAVIOR ; PLASMAS ; PHYSICS ; BIFURCATION ; TURBULENCE ; TRANSPORT |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000344964200003 |
| 源URL | [http://119.78.100.186/handle/113462/46549]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Xu, G. S. |
| 作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 2.Southwestern Inst Phys, Chengdu 610041, Peoples R China 3.Univ Calif San Diego, CMTFO, La Jolla, CA 92093 USA 4.Natl Fus Res Inst, WCI Ctr Fus Theory, Taejon 305333, South Korea 5.Univ Sci & Technol China, Dept Modern Phys, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China 6.Tech Univ Denmark, Dept Phys, Assoc EURATOM DTU, DK-2800 Lyngby, Denmark 7.Japan Atom Energy Agcy, Ctr Computat Sci & eSyst, Kashiwa, Chiba 2778587, Japan 8.EURATOM Assoziat, Max Planck Inst Plasmaphys, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Xu, G. S.,Wang, H. Q.,Xu, M.,et al. Dynamics of L-H transition and I-phase in EAST[J]. NUCLEAR FUSION,2014,54:21. |
| APA | Xu, G. S..,Wang, H. Q..,Xu, M..,Wan, B. N..,Guo, H. Y..,...&Gong, X. Z..(2014).Dynamics of L-H transition and I-phase in EAST.NUCLEAR FUSION,54,21. |
| MLA | Xu, G. S.,et al."Dynamics of L-H transition and I-phase in EAST".NUCLEAR FUSION 54(2014):21. |
入库方式： OAI收割
来源：近代物理研究所
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