globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA024926
Scopus记录号: 2-s2.0-85052510385
论文题名:
Spacecraft-Charging Mitigation of a High-Power Electron Beam Emitted by a Magnetospheric Spacecraft: Simple Theoretical Model for the Transient of the Spacecraft Potential
作者: LuccoCastello F.; Delzanno G.L.; Borovsky J.E.; Miars G.; Leon O.; Gilchrist B.E.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:8
起始页码: 6424
结束页码: 6442
语种: 英语
英文关键词: electron beams ; magnetosphere-ionosphere coupling ; particle-in-cell simulations ; plasma contactors ; spacecraft charging
英文摘要: A spacecraft-charging mitigation scheme necessary for the operation of a high-power electron beam in the low-density magnetosphere is analyzed. The scheme is based on a plasma contactor, that is, a high-density charge-neutral plasma emitted prior to and during beam emission and its ability to emit high ion currents without strong space-charge limitations. A simple theoretical model for the transient of the spacecraft potential and contactor expansion during beam emission is presented. The model focuses on the contactor ion dynamics and is valid in the limit when the ion contactor current is equal to the beam current. The model is found in very good agreement with particle-in-cell simulations over a large parametric study that varies the initial expansion time of the contactor, the contactor current, and the ion mass. The model highlights the physics of the spacecraft-charging mitigation scheme, indicating that the most important part of the dynamics is the evolution of the outermost ion front, which is pushed away by the charge accumulated in the system by the beam. The model can be also used to estimate the long-time evolution of the spacecraft potential. For a short contactor expansion (0.3- or 0.6-ms helium plasma or 0.8-ms argon plasma, both with 1-mA current) it yields a peak spacecraft potential of the order of 1–3 kV. This implies that a 1-mA relativistic electron beam would be easily emitted by the spacecraft. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113423
Appears in Collections:气候减缓与适应

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作者单位: Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, United States; Space Science Institute, Boulder, CO, United States; Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, United States; Applied Physics Program, University of Michigan, Ann Arbor, MI, United States

Recommended Citation:
LuccoCastello F.,Delzanno G.L.,Borovsky J.E.,et al. Spacecraft-Charging Mitigation of a High-Power Electron Beam Emitted by a Magnetospheric Spacecraft: Simple Theoretical Model for the Transient of the Spacecraft Potential[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)
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