Edge shear flows and particle transport near the density limit of the HL-2A tokamak
作者: R. HongG.R. TynanP.H. DiamondL. NieD. GuoT. LongR. KeY. WuB. YuanM. XuThe HL-2A Team
作者单位: 1Center for Energy Research, University of California San Diego, La Jolla, CA 92093, United States of America
2Center for Astrophysics and Space Sciences, University of California San Diego, La Jolla, CA 92093, United States of America
3Center for Fusion Sciences, Southwestern Institute of Physics, Chengdu, Sichuan 610041, People’s Republic of China
4Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
5School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
刊名: Nuclear Fusion, 2018, Vol.58 (1)
来源数据库: Institute of Physics Journal
DOI: 10.1088/1741-4326/aa9626
原始语种摘要: Edge shear flow and its effect on regulating turbulent transport have long been suspected to play an important role in plasmas operating near the Greenwald density limit n G. In this study, equilibrium profiles as well as the turbulent particle flux and Reynolds stress across the separatrix in the HL-2A tokamak are examined as is approached in ohmic L-mode discharges. As the normalized line-averaged density is raised, the shearing rate of the mean poloidal flow drops, and the turbulent drive for the low-frequency zonal flow (the Reynolds power ) collapses. Correspondingly, the turbulent particle transport increases drastically with increasing collision rates. The geodesic acoustic modes (GAMs) gain more energy from the ambient turbulence at higher densities, but have smaller...
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  • density 密度
  • tokamak 托卡马克
  • particle 颗粒
  • transport 输运
  • shearing 剪断
  • Reynolds 雷诺
  • adiabaticity 绝热性
  • geodesic 测地的
  • zonal 带状的
  • turbulent 紊聊