文献类型：期刊文献

英文题名：Global geodesic acoustic mode in an ideal magnetohydrodynamic tokamak plasma

作者：Ren, Haijun[1,2,3];Wei, Lai[4,5];Zhang, Debing[6];Xu, X. Q.[3]

机构：[1]Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China;[2]Univ Sci & Technol China, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China;[3]Lawrence Livermore Natl Lab, Livermore, CA 94550 USA;[4]Dalian Univ Technol, Key Lab Mat Modificat Laser Electron & Ion Beams, Minist Educ, Dalian 116024, Peoples R China;[5]Dalian Univ Technol, Sch Phys, Dalian 116024, Peoples R China;[6]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2020

卷号：27

期号：4

外文期刊名：PHYSICS OF PLASMAS

收录：;EI(收录号：20201608418650);WOS:【SCI-EXPANDED(收录号:WOS:000524407500005)】；

基金：This work was supported by the National Natural Science Foundation of China under Grant No. 11675175, the China National Magnetic Confinement Fusion Energy Research Project under Grant No. 2015GB120005, the Fundamental Research Funds for the Central Universities under Grant No. DUT17RC(4)54, and the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology under Grant No. 2018CXFX009. This work was performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344.

语种：英文

外文关键词：Magnetohydrodynamics - Aspect ratio - Tokamak devices - Geodesy - Magnetoplasma

摘要：A concise and transparent second order ordinary differential equation (ODE) describing the radial structure of the global geodesic acoustic mode (GAM) is analytically presented in a low-beta tokamak plasma. The large-aspect-ratio and circular cross section are assumed to linearize the ideal magnetohydrodynamic equations. We show clearly how finite beta-dependent terms affect the global GAM frequency and radial mode structure. A typical Wentzel-Kramers-Brillouin form of solution is found for some reversed shear equilibria. For some other equilibria with lower beta, even also in a reversed shear tokamak, the GAM continuum is upraised by the high order beta-dependent terms so that its maximum is beyond omega(G), where omega(G) is the classical local frequency of GAM. As a result, no self-consistent solution to the ODE can be found. Published under license by AIP Publishing.