Saturation of Alfvén modes in tokamak plasmas investigated by Hamiltonian mapping techniques
作者: S. BriguglioM. SchnellerX. WangC. Di TroiaT. Hayward-SchneiderV. FuscoG. VladG. Fogaccia
作者单位: 1ENEA, Dipartimento FSN, C. R. Frascati, via E. Fermi 45, I-00044 Frascati (Roma), Italy
2Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA
3Max Planck Institute for Plasma Physics, 85748 Garching, Germany
刊名: Nuclear Fusion, 2017, Vol.57 (7)
Institute of Physics Journal
DOI: 10.1088/1741-4326/aa515b
原始语种摘要: Nonlinear dynamics of single toroidal number Alfvén eigenmodes destabilised by the the resonant interaction with fast ions is investigated, in tokamak equilibria, by means of Hamiltonian mapping techniques. The results obtained by two different simulation codes, XHMGC and HAGIS, are presented for n = 2 Beta induced Alfvén eigenmodes and, respectively n = 6 toroidal Alfvén eigenmodes. Simulations of the bump-on-tail instability performed by a 1-dimensional code, PIC1DP, are also analysed for comparison. As a general feature, modes saturate as the resonant-particle distribution function is flattened over the whole region where mode-particle power transfer can take place in the linear phase. Such region is limited by the narrowest of resonance width and mode width. In the former case, mode...
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  • tokamak 托卡马克
  • Hamiltonian 哈密(尔)顿
  • modes 模式
  • width 幅度
  • scaling 按比例缩小
  • harmonic 谐波
  • mapping 映象
  • single 单独的
  • large 大的
  • radial 放射状的