Nonlinear Coupling of Reversed Shear Alfvén Eigenmode and Toroidal Alfvén Eigenmode during Current Ramp

作     者：Shizhao Wei Yahui Wang Peiwan Shi Wei Chen Ningfei Chen Zhiyong Qiu Shizhao Wei;Yahui Wang;Peiwan Shi;Wei Chen;Ningfei Chen;Zhiyong Qiu

作者机构：Institute for Fusion Theory and Simulation and Department of PhysicsZhejiang UniversityHangzhou 310027China Southwestern Institute of PhysicsP.O.Box 432Chengdu 610041China Key Laboratory of Materials Modification by LaserIonand Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2021年第38卷第3期

页      面：50-54页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

基　　金：Supported by the National Key R&D Program of China(Grant No.2017YFE0301900) the National Natural Science Foundation of China(Grant No.11875233) the China Postdoctoral Science Foundation(Grant No.2020M670756) 

主　　题：mode nonlinear reversed 

摘      要：Two novel nonlinear mode coupling processes for reversed shear Alfvén eigenmode(RSAE) nonlinear saturation are proposed and investigated. In the first process, the RSAE nonlinearly couples to a co-propagating toroidal Alfvén eigenmode(TAE) with the same toroidal and poloidal mode numbers, and generates a geodesic acoustic mode. In the second process, the RSAE couples to a counter-propagating TAE and generates an ion acoustic wave quasi-mode. The condition for the two processes to occur is favored during current ramp. Both the processes contribute to effectively saturate the Alfvénic instabilities, as well as nonlinearly transfer of energy from energetic fusion alpha particles to fuel ions in burning plasmas.