Institutional Repository of Chinese Acad Sci, High Field Magnet Lab,Hefei 230031, Anhui, Peoples R China
A theory of self-organized zonal flow with fine radial structure in tokamak | |
Zhang, Y. Z.1; Liu, Z. Y.2; Xie, T.3; Mahajan, S. M.4; Liu, J.1,2 | |
2017-12-01 | |
发表期刊 | PHYSICS OF PLASMAS |
ISSN | 1070-664X |
摘要 | The (low frequency) zonal flow-ion temperature gradient (ITG) wave system, constructed on Braginskii's fluid model in tokamak, is shown to be a reaction-diffusion-advection system; it is derived by making use of a multiple spatiotemporal scale technique and two-dimensional (2D) ballooning theory. For real regular group velocities of ITG waves, two distinct temporal processes, sharing a very similar meso-scale radial structure, are identified in the nonlinear self-organized stage. The stationary and quasi-stationary structures reflect a particular feature of the poloidal group velocity. The equation set posed to be an initial value problem is numerically solved for JET low mode parameters; the results are presented in several figures and two movies that show the spatiotemporal evolutions as well as the spectrum analysis-frequency-wave number spectrum, auto power spectrum, and Lissajous diagram. This approach reveals that the zonal flow in tokamak is a local traveling wave. For the quasi-stationary process, the cycle of ITG wave energy is composed of two consecutive phases in distinct spatiotemporal structures: a pair of Cavitons growing and breathing slowly without long range propagation, followed by a sudden decay into many Instantons that carry negative wave energy rapidly into infinity. A spotlight onto the motion of Instantons for a given radial position reproduces a Blob-Hole temporal structure; the occurrence as well as the rapid decay of Caviton into Instantons is triggered by zero-crossing of radial group velocity. A sample of the radial profile of zonal flow contributed from 31 nonlinearly coupled rational surfaces near plasma edge is found to be very similar to that observed in the JET Ohmic phase [J. C. Hillesheim et al., Phys. Rev. Lett. 116, 165002 (2016)]. The theory predicts an interior asymmetric dipole structure associated with the zonal flow that is driven by the gradients of ITG turbulence intensity. Published by AIP Publishing. |
DOI | 10.1063/1.4995302 |
关键词[WOS] | ION-TEMPERATURE-GRADIENT ; DRIFT WAVES ; TURBULENT TRANSPORT ; SHEAR-FLOW ; GENERATION ; PLASMA ; MODES ; DRIVEN ; SIMULATIONS ; INSTABILITY |
收录类别 | SCI |
语种 | 英语 |
资助项目 | U.S. Dept. of Energy[DE-FG02-04ER-54742] ; Foundation of Sichuan University of Science and Engineering[2016RCL21] ; Scientific Research Fund of the Sichuan Provincial Education Department[17ZA0281] ; National Natural Science Foundation of China[11575186] ; National Natural Science Foundation of China[NSFC-11575185] ; National Magnetic Confinement Fusion Energy Research Project[2015GB111003] ; Key Research Program of Frontier Sciences CAS[QYZDB-SSWSYS004] ; Key Research Program of Frontier Sciences CAS[QYZDB-SSWSYS004] ; National Magnetic Confinement Fusion Energy Research Project[2015GB111003] ; National Natural Science Foundation of China[NSFC-11575185] ; National Natural Science Foundation of China[11575186] ; Scientific Research Fund of the Sichuan Provincial Education Department[17ZA0281] ; Foundation of Sichuan University of Science and Engineering[2016RCL21] ; U.S. Dept. of Energy[DE-FG02-04ER-54742] |
WOS研究方向 | Physics |
WOS类目 | Physics, Fluids & Plasmas |
WOS记录号 | WOS:000418957200027 |
出版者 | AMER INST PHYSICS |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.hfcas.ac.cn:8080/handle/334002/35012 |
专题 | 中科院强磁场科学中心 |
通讯作者 | Liu, Z. Y. |
作者单位 | 1.Chinese Acad Sci, Ctr Magnet Fus Theory, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China 3.Sichuan Univ Sci & Engn, Sch Sci, Zigong 643000, Sichuan, Peoples R China 4.Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Zhang, Y. Z.,Liu, Z. Y.,Xie, T.,et al. A theory of self-organized zonal flow with fine radial structure in tokamak[J]. PHYSICS OF PLASMAS,2017,24(12):16. |
APA | Zhang, Y. Z.,Liu, Z. Y.,Xie, T.,Mahajan, S. M.,&Liu, J..(2017).A theory of self-organized zonal flow with fine radial structure in tokamak.PHYSICS OF PLASMAS,24(12),16. |
MLA | Zhang, Y. Z.,et al."A theory of self-organized zonal flow with fine radial structure in tokamak".PHYSICS OF PLASMAS 24.12(2017):16. |
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