Peace: A plasma electron and current experiment
Peace: A plasma electron and current experiment
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DOI：
10.1023/a:1004938001388
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发表时间：
1997-01-01
影响因子：
10.3
通讯作者：
Woodliffe, RD
中科院分区：
文献类型：
--
作者：
Johnstone, AD;Alsop, C;Woodliffe, RD
本文介绍了一种电子分析仪，用于测量星团使命的四个航天器上能量范围从0.59 eV到26.4 keV的电子的三维速度分布。该仪器由两个传感器组成，带有半球形静电能量分析仪，位置敏感微通道板探测器放置在航天器的相对两侧。这两种传感器的本征能量分辨率分别为12.7%和16.5%。它们的角分辨率在方位方向上分别为2.8度和5.3度，在极方向上为15度。这两个传感器通常将在不同的重叠能量范围内进行测量，并将在航天器旋转半圈或重叠范围内2秒内扫描分布。虽然这是最快的时间分辨率为完整的分布，部分分布可以记录在短短的62.5毫秒和角分布在一个固定的能量在7.8毫秒。仪器的动态范围是足够的，以提供准确的测量主要已知的人口从尾瓣的等离子体和太阳风。虽然仪器的基本结构是传统的，但在设计中特别注意提高仪器的精度，以便在飞行中可以达到1%的相对值，以便准确测量四个航天器之间的梯度;将这种技术所覆盖的最小能量从10电子伏降低到1电子伏;并提供良好的三维分布。
An electron analyser to measure the three-dimensional velocity distribution of electrons in the energy range from 0.59 eV to 26.4 keV on the four spacecraft of the Cluster mission is described. The instrument consists of two sensors with hemispherical electrostatic energy analysers with a position-sensitive microchannel plate detectors placed to view radially on opposite sides of the spacecraft. The intrinsic energy resolutions of the two sensors are 12.7% and 16.5% full width at half maximum. Their angular resolutions are 2.8 degrees and 5.3 degrees respectively in an azimuthal direction and 15 degrees in a polar direction. The two sensors will normally measure in different overlapping energy ranges and will scan the distribution in half a spacecraft rotation or 2 s in the overlapped range. While this is the fastest time resolution for complete distributions, partial distributions can be recorded in as little as 62.5 ms and angular distributions at a fixed energy in 7.8 ms. The dynamic range of the instrument is sufficient to provide accurate measurements of the main known populations from the tail lobe to the plasmasheet and the solar wind. While the basic structure of the instrument is conventional, special attention has been paid in the design to improving the precision of the instrument so that a relative of the order of 1% could be attained in flight in order to measure the gradients between the four spacecraft accurately; to decreasing the minimum energy covered by this technique from 10 eV down to 1 eV; and to providing good three dimensional distributions.