Nonlinear coupling of reversed shear Alfven eigenmode and toroidal Alfven eigenmode during current ramp

Autor:	Wei, Shizhao, Wang, Yahui, Shi, Peiwan, Chen, Wei, Chen, Ningfei, Qiu, Zhiyong
Rok vydání:	2021
Předmět:	Physics - Plasma Physics
Zdroj:	Chinese Physical Letters Vol.38, No.3(2021)035201
Druh dokumentu:	Working Paper
DOI:	10.1088/0256-307X/38/3/035201
Popis:	Two novel nonlinear mode coupling processes for reversed shear Alfven eigenmode (RSAE) nonlinear saturation are proposed and investigated. In the first process, RSAE nonlinearly couples to a co-propagating toroidal Alfven eigenmode (TAE) with the same toroidal and poloidal mode numbers, and generates a geodesic acoustic mode (GAM). In the second process, RSAE couples to a counter-propagating TAE and generates an ion acoustic wave quasi-mode (IAW). The condition for the two processes to occur is favored during current ramp. Both processes contribute to effectively saturate the Alfvenic instabilities, as well as nonlinearly transfer of energy from energetic fusion alpha particles to fuel ions in burning plasmas. Comment: 5 pages, 2 figs
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2103.09446 Zobrazit plný text záznamu View this record from Arxiv