Cluster-Samba Prime Parameter Cluster Ion Spectrometry (CIS) Data

This instrument (CIS: Cluster Ion Spectrometry) is capable of obtaining full 3D ion distributions with high time resolution (in one spacecraft spin) and mass-per-charge resolution. The experiment consists of two different instruments, a Hot Ion Analyzer (HIA) and a time-of-flight Ion Composition and Distribution Function analyzer (CODIF). Extensive on-board processing is done, within its dual-processor Data Processing System (DPS). CODIF determines the distributions of the major ion species with energies from spacecraft potential to 40 KeV/charge with an angular resolution of 22.5 x 10.25 degrees and with two different sensitivities. The CODIF instrument uses electrostatic deflection to select by energy per charge, with subsequent time-of-flight analysis. The sensor primarily covers the energy range 0.02-40 KeV/charge, but with additional pre-acceleration for energies below 25 eV/charge, the range is extended to energies as low as the spacecraft potential. The HIA does not measure mass, but extends the dynamic range to the highest ion fluxes, and has angular resolution capability of 5.6 x 5.6 degrees for ion-beam and solar-wind measurements. The HIA is a symmetric quadrispherical analyzer of top-hat geometry, and uses microchannel-plate electron multipliers and position encoding by discrete anodes. A 2D distribution is obtained once per 62.5 ms, and a full 3D distribution of ions in the energy range ~5 eV/charge to 32 KeV/charge is obtained every 4 s. For more details of the Cluster mission, the spacecraft, and its instruments, see the report Cluster: mission, payload and supporting activities, March 1993, ESA SP-1159, and the included article The Cluster Ion Spectrometry Experiment, by H. Reme et al., from which this information was obtained.

本装置（CIS：簇离子光谱仪）能够以高时间分辨率（在一次航天器自旋周期内）和电荷/质量分辨率，获取完整的3D离子分布。实验由两种不同的仪器组成，分别为热离子分析仪（HIA）和飞行时间离子组成与分布函数分析仪（CODIF）。在双处理器数据处理系统（DPS）中，对数据进行广泛的在轨处理。CODIF能够测定主要离子种类的分布，能量范围从航天器电势至40 KeV/电荷，具有22.5 x 10.25度的角分辨率，并具备两种不同的灵敏度。CODIF仪器通过静电偏转按电荷/能量选择，随后进行飞行时间分析。传感器主要覆盖0.02-40 KeV/电荷的能量范围，但在25 eV/电荷以下的能量范围，通过额外的预加速，能量范围可扩展至航天器电势以下。HIA不测量质量，但扩展了动态范围至最高离子通量，并具有5.6 x 5.6度的角分辨率，适用于离子束和太阳风测量。HIA是一种对称的四球面分析仪，采用顶帽几何形状，并使用微通道板电子倍增器和离散阳极进行位置编码。每62.5毫秒获得一次二维分布，每4秒获得一次能量范围约为5 eV/电荷至32 KeV/电荷的完整三维离子分布。关于Cluster任务、航天器和其仪器的更多详细信息，请参阅1993年3月发布的报告《Cluster：任务、有效载荷和支持活动》，以及其中包含的文章《Cluster离子光谱仪实验》，H. Reme等人所著，本信息即来源于此。