Background subtraction for the Cluster/CODIF plasma ion mass spectrometer
Background subtraction for the Cluster/CODIF plasma ion mass spectrometer
复制标题
Cluster/CODIF 等离子体离子质谱仪的背景扣除
DOI：
10.5194/gi-3-41-2014
复制
发表时间：
2013
影响因子：
1.9
通讯作者：
Y. Liu
中科院分区：
文献类型：
--
作者：
C. Mouikis;L. Kistler;G. Wang;Y. Liu
抽象的。Cluster航天器上的CODIF仪器是一个飞行时间离子质谱仪。尽管TOF光谱仪由于固有的双符合要求而相对不受背景污染的影响，但高背景率仍然可能导致假符合。沿着星团轨道，由于相对论电子在与地球辐射带相遇时的穿透辐射，经常会观察到假符合。当一个物种的事件落入为另一个物种定义的飞行时间范围内时，这些仪器中的第二种背景发生。虽然溢出到He +测量中的H +事件的分数很小，但当实际He +通量很低时，这可能导致显著的污染。在本文中，我们提出了两种技术，允许扣除的假巧合和H +“溢出”的CODIF测量。
Abstract. The CODIF instrument on the Cluster spacecraft is a time-of-flight (TOF) ion mass spectrometer. Although TOF spectrometers are relatively immune to background contamination due to the inherent double coincidence requirement, high background rates can still result in false coincidences. Along the Cluster orbit, false coincidences are commonly observed due to the penetrating radiation of relativistic electrons during the encounters with the Earth's radiation belts. A second type of background in these instruments occurs when events of one species fall into the time-of-flight range defined for another species. Although the fraction of the H + events that spill into the He + measurement is small, when the actual He + fluxes are low this can result in significant contamination. In this paper we present two techniques that allow the subtraction of the false coincidences and the H + "spill" from the CODIF measurements.