The co-excitation of electrostatic ion-cyclotron wave and ion-Bernstein-like wave launched from a grid  

作　　者：Hongyu SUN Jinxiu MA Yaodong ZHAO Wan TAO Qi LIU 孙洪宇;马锦秀;赵耀东;陶万;刘琦(School of Physical Sciences and CAS Key Laboratory of Geospace Environment,University of Science and Technology of China,Hefei 230026,People’s Republic of China)

机构地区：[1]School of Physical Sciences and CAS Key Laboratory of Geospace Environment,University of Science and Technology of China,Hefei 230026,People’s Republic of China

出　　处：《Plasma Science and Technology》2025年第3期1-9,共9页等离子体科学和技术(英文版)

基　　金：supported by National Natural Science Foundation of China (No.11975229)。

摘　　要：Electrostatic ion-cyclotron wave(EICW)and ion-Bernstein wave(IBW)are two typical normal modes of plasma propagating vertically to a magnetic field.These modes satisfy the extreme conditionsω《k_(||)v_(te)andω》k_(||)v_(te),whereω,k_(||),and v_(te)are the wave angular frequency,wave number parallel to the magnetic field,and the electron thermal speed.Between these extremities,there exist IBW-like waves that have not been studied.In this paper,the co-excitation of the EICW and IBW-like wave in an experiment is presented.It is shown that,in an argon(Ar)discharge,the EICW appears in the fundamental and second harmonic frequency bands of the ioncyclotron frequency.In contrast,the IBW-like wave appears in the higher harmonic frequency bands and in the case of a relatively strong magnetic field.In a helium(He)discharge,the IBW-like wave is excited in the fundamental frequency band,but the wave behaviour becomes complicated in the harmonic frequency bands.The measured dispersion relations of the excited EICW are in agreement with the results of the fluid and kinetic models in some range of frequencies,but those of the excited IBW-like wave are only in qualitative agreement with the kinetic model of the IBW.This study is important for identifying the IBW-like mode that may have potential application in plasma heating via Landau damping.

关 键 词：electrostatic ion-cyclotron wave ion-Bernstein-like wave dispersion relation 

分 类 号：O17[理学—数学]