朱雀X射线成像光谱仪间隔行电荷注入的CTI校正新方法
New CTI Correction Method for the Spaced-Row Charge Injection of the Suzaku X-Ray Imaging Spectrometer
摘要：
朱雀卫星上的X射线CCD（X射线成像光谱仪; XIS）自发射以来由于辐射损伤而增加了电荷转移效率（CTI），并且能量分辨率已经降低。为了改善CTI，我们已经应用了空间行电荷注入（SCI）技术的XIS在轨道上，通过注入电荷到CCD行定期，CTI积极减少。SCI模式中的CTI取决于信号电荷与前一注入行之间的距离，并且脉冲高度显示出周期性的位置变化。使用机载校准源和英仙座星系团的强铁线的飞行数据，我们详细研究了变化。我们开发了一种新的方法来校正这种变化。通过应用新的方法，在2008年3月的5.9 keV的能量分辨率（FWHM）是~155 eV的前照式CCD和~175 eV的背照式CCD。
英文摘要：
The charge transfer inefficiency (CTI) of the X-ray CCDs on board the Suzaku satellite (X-ray Imaging Spectrometers; XIS) has increased since the launch due to radiation damage, and the energy resolution has been degraded. To improve the CTI, we have applied a spaced-row charge injection (SCI) technique to the XIS in orbit; by injecting charges into CCD rows periodically, the CTI is actively decreased. The CTI in the SCI mode depends on the distance between a signal charge and a preceding injected row, and the pulse height shows periodic positional variations. Using in-flight data of onboard calibration sources and of the strong iron line from the Perseus cluster of galaxies, we studied the variation in detail. We developed a new method to correct the variation. By applying the new method, the energy resolution (FWHM) at 5.9 keV at March 2008 is ~155 eV for the front-illuminated CCDs and ~175 eV for the back-illuminated CCD.
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