Electron cyclotron drift instability and anomalous transport: two-fluid moment theory and modeling
نویسندگان
چکیده
Abstract In the presence of a strong electric field perpendicular to magnetic field, electron cross-field (E × B) flow relative unmagnetized ions can cause so-called cyclotron drift instability (ECDI) due resonances ion acoustic mode and harmonics. This occurs in, for example, collisionless shock ramps in space, E B discharge devices such as Hall thrusters. A prominent feature ECDI is its capability induce an parallel background at speed greatly exceeding predictions by classical collision theory. Such anomalous transport important role particle thermalization space shocks, causing plasma flows towards walls devices, leading unfavorable erosion performance degradation, etc. The development often considered requiring fully kinetic treatment. this work, however, we demonstrate that reduced variant instability, more importantly, associated transport, be treated self-consistently two-fluid framework without any adjustable parameter. By treating both species on equal footing, free energy inter-species velocity shear allows growth field. We will first present linear analyses five- ten-moment models, compare them against fully-kinetic At low temperatures, models predict fastest-growing good agreement with result. Also, including \!=10)$?> ( > = 10 stretchy="false">) moments, secondary (and possibly higher) unstable branches recovered. dependence ion-to-electron mass ratio, temperature, strength also thoroughly explored. then carry out direct numerical simulations setup using five-moment model. well confirmed excellent theoretical predictions. force balance properties are studied simulation data. work casts new insights into nature demonstrates potential moment model efficient modeling plasmas.
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ژورنال
عنوان ژورنال: Plasma Sources Science and Technology
سال: 2022
ISSN: ['1361-6595', '0963-0252']
DOI: https://doi.org/10.1088/1361-6595/ac90e7