Observed on-orbit background of the ACIS instrument on the Chandra X-ray Observatory
Observed on-orbit background of the ACIS instrument on the Chandra X-ray Observatory
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钱德拉 X 射线天文台 ACIS 仪器在轨背景观测
DOI：
10.1117/12.391607
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
S. Virani
中科院分区：
文献类型：
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作者：
P. Plucinsky;S. Virani
我们分析了在钱德拉X射线天文台使命的轨道激活和检查（OAC）和客座观察员（GO）阶段获得的数据，以表征由高能粒子产生的先进CCD成像光谱仪（ACIS）仪器的背景。ACIS仪器包含8个前照明（FI）CCD和2个后照明（BI）CCD。FI和BI CCD对粒子通量的增强表现出显著不同的响应。FI CCD显示总体计数率的增加相对较小，典型的增加是比静态水平高1 - 5 cts-1; BI CCD可以显示比静态水平高100 cts s-1的大偏移。增强背景的这些间隔的持续时间也是高度可变的，范围从500 s到104 s。当钱德拉靠近辐射带时，这些背景增强的时期有时但并不总是与粒子通量增加有关。我们看到了与钱德拉上的电子、质子、氦仪器粒子探测器的低能电子通道弱相关的证据。我们提出了一些最极端的例子，这些背景增强确定到这一点上的使命。
We have analyzed data acquired during the Orbital Activation and Checkout (OAC) and Guest Observer (GO) phases of the Chandra X-ray Observatory mission in order to characterize the background of the Advanced CCD Imaging Spectrometer (ACIS) instrument produced by energetic particles. The ACIS instrument contains 8 Front-Illuminated (FI) CCDs and 2 Back-Illuminated (BI) CCDs. The FI and BI CCDs exhibit dramatically different responses to enhancements in the particle flux. The FI CCDs show relatively little increase in the overall count rate, typical increases are 1 - 5 cts s-1 above the quiescent level; the BI CCDs can show large excursions to a s high as 100 cts s-1 above the quiescent level. The durations of these intervals of enhanced background are also highly variable ranging from 500 s to 104 s. These periods of enhanced background are sometimes but not always associated with increased particle flux when Chandra is near the radiation belts. We see evidence for a weak correlation with the low-energy electron channel of the Electron, Proton, Helium Instrument particle detector instrument on-board Chandra. We present some of the most extreme examples of these background enhancements identified to this point in the mission.