Plasma particle simulations on stray photoelectron current flows around a spacecraft
Plasma particle simulations on stray photoelectron current flows around a spacecraft
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航天器周围杂散光电子流的等离子体粒子模拟
DOI：
10.1029/2012ja017673
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and H. Nakashima
中科院分区：
文献类型：
--
作者：
Miyake;Y.;H. Usui;H. Kojima;and H. Nakashima
在稀薄的空间等离子体中，光电子流在航天器的多个导电元件之间产生复杂的电流路径，这可能会影响双探头电场传感器的电流-电压特性。我们对这种影响进行了全粒子模拟，方法是采用最近设计的典型传感器配置，如CLUSTER、THEMIS和BEPEPALLOMBO/MMO上的传感器配置；球形探头与导电吊杆之间由偏置电极隔开，该电极被称为“存根”和“护罩”。假定的偏置电势方案对应于为比佩科伦坡/MMO计划的偏置电势方案，并不同于其他卫星使用的偏置电势方案。分析的重点是流经这些电极和航天器主体的杂散光电子电流。接近探测器的光电子通常被保护层排斥，其电势被强烈的负偏压，随后受到探测器电势的影响。因此，当探测器在等离子体和漂浮的航天器电势之间运行时，光电子电流的大小随着探测器电势的增加而增加，而不考虑它们的来源。结果表明，通过选择尽可能接近等离子体电位的探头工作电位，可以使来自航天器本体和偏置电极的光电子电流最小化。我们还研究了保护电极运行与否对光电子电流的依赖关系，并证实了减少来自航天器的光电子电流的积极作用。然而，当探头几乎在等离子体电势下工作时，保护操作的负面影响会增强来自短桩和保护的光电子电流。
In tenuous space plasmas, photoelectron flows produce complex current paths among multiple conducting elements of spacecraft, which may influence the current–voltage characteristics of double‐probe electric field sensors. We performed full‐particle simulations on this effect by assuming a sensor configuration that is typical of recent designs like those on Cluster, THEMIS, and BepiColombo/MMO; the spherical probe is separated from a conducting boom by biased electrodes known as the ‘stub’ and the ‘guard’. The assumed bias potential scheme corresponds to that planned for BepiColombo/MMO and is different from those used in the other satellites. The analysis focuses on stray photoelectron currents flowing from these electrodes and a spacecraft body. Photoelectrons approaching the probe are commonly repelled by the guard, the potential of which is strongly biased negatively, and are subsequently affected by the probe potential. Consequently, the photoelectron current magnitude increases with increasing probe potential regardless of their origins, when the probe operates between the plasma and floating spacecraft potentials. The result indicates that both photoelectron currents from the spacecraft body and biased electrodes can be minimized by selecting the probe working potential as close as possible to the plasma potential. We also examine the photoelectron current dependence on the presence or absence of the guard electrode operation and confirm a positive effect of reducing the photoelectron current from the spacecraft. However, negative side effects of the guard operation enhance the photoelectron currents from the stub and guard, when the probe operates nearly at the plasma potential.
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影响因子：
1
作者：
S. Lai
通讯作者：
S. Lai
DOI：
10.1029/jz072i003p01109
发表时间：
1967
期刊：
影响因子：
--
作者：
F. Mozer;P. Bruston
通讯作者：
P. Bruston
T2K开放超级计算机：新一代超级计算机的跨大学、跨学科合作
DOI：
10.1109/icks.2008.6
发表时间：
2008
期刊：
International Conference on Informatics Education and Research for Knowledge-Circulating Society (icks 2008)
影响因子：
--
作者：
H. Nakashima
通讯作者：
H. Nakashima
空间等离子体波仪器设计原理
DOI：
10.1002/9781118664391.ch14
发表时间：
1998
期刊：
Geophysical monograph
影响因子：
--
作者：
D. Gurnett
通讯作者：
D. Gurnett
离子鞘包围偶极子天线阻抗的电磁粒内模拟
DOI：
--
发表时间：
2008
期刊：
Radio Science (in press)
影响因子：
--
作者：
Miyake;Y.
通讯作者：
Y.