Experiment and simulations of kinetic instabilities in mirror-confined ECR discharge plasma

B. Eliasson, M. Viktorov, S. Golubev, D.C. Speirs, D. Mansfeld, A.D.R. Phelps, R. Bingham, A.W. Cross, K. Ronald

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Abstract

Non-Maxwellian electron distribution functions give rise to a rich variety of kinetic instabilities, such as streaming instability, Weibel instability, and electrostatic and electromagnetic cyclotron instabilities. Electron ring-like distributions are ubiquitous in space plasmas and also occur in mirror-confined plasma where the loss-cone cuts a 'hole' in the distribution function. We report recent observations and simulations of instabilities in mirror-confined ECR discharge plasma [1], where excitation on harmonics and half-harmonics of the electron cyclotron frequency have been observed. The relevance to space plasma are also discussed where similar observations by satellites are common [2,3]. Theory and simulations show that electrostatic instabilities take place where two electron Bernstein modes merge [4]. Electromagnetic Vlasov simulations also show the coupling between electrostatic and electromagnetic electron Bernstein modes leading to instabilities near cyclotron harmonics.
Original languageEnglish
Publication statusPublished - 4 Dec 2019
Event5th Microwaves in Plasmas and Beams Workshop - University of Strathclyde, Glasgow, United Kingdom
Duration: 4 Dec 20195 Dec 2019

Conference

Conference5th Microwaves in Plasmas and Beams Workshop
CountryUnited Kingdom
CityGlasgow
Period4/12/195/12/19

Keywords

  • kinetic instabilities
  • plasma physics
  • space plasmas

Projects

Cite this

Eliasson, B., Viktorov, M., Golubev, S., Speirs, D. C., Mansfeld, D., Phelps, A. D. R., Bingham, R., Cross, A. W., & Ronald, K. (2019). Experiment and simulations of kinetic instabilities in mirror-confined ECR discharge plasma. Abstract from 5th Microwaves in Plasmas and Beams Workshop, Glasgow, United Kingdom.