期刊
PLASMA SOURCES SCIENCE & TECHNOLOGY
卷 30, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6595/ac02b3
关键词
Hall thrusters; particle-in-cell; electron drift instability; transport; ion transit-time instability
资金
- Agence Nationale de la Recherche [ANR-16-CHIN-0003-01]
- Safran Aircraft Engines within the project POSEIDON
Recent studies have found that enhanced electron transport in Hall thrusters may be attributed to the interaction between axial ion transit-time instabilities (ITTI) and azimuthal electron drift instabilities (EDI). Simulation results indicate that a transition from short to long-wavelength only occurs when breathing mode and ITTI are captured in the simulation.
Recent simulations and experiments have observed a transition from short to long-wavelength azimuthal instabilities that leads to enhanced electron transport in Hall thrusters. Here we make the hypothesis that this phenomenon stems directly from the interaction between the axial ion transit-time instabilities (ITTI), and the azimuthal electron drift instability (EDI). This interaction is studied using 2D axial-azimuthal self-consistent particle-in-cell simulations which include a 1D neutral dynamics solver. It is found that a short to long-wavelength transition only occurs if the breathing-mode and ITTI are captured in the simulation, and two distinct instability regions can be distinguished depending on the local ion Mach number. Upstream of the ion sonic point the EDI exhibits an ion-acoustic behaviour, and the associated instability-enhanced electron transport is well described by a previously developed model based on kinetic theory. Downstream of the ion sonic point however, the ITTI significantly changes the local plasma parameters, and this modifies the EDI while increasing the electron transport.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据