高脉冲率微量热计Spectroscopy：多脉冲拟合技术
Microcalorimeter Spectroscopy at High Pulse Rates: a Multi-Pulse Fitting Technique
摘要：
过渡边缘传感器微量热计可以测量X射线和伽马射线能量，具有非常高的能量分辨率和高光子收集效率。为了使这项技术在未来的X射线观测站中发挥其全部潜力，每个传感器必须能够每秒测量数百甚至数千个光子能量。目前的“最佳滤波”方法，以实现最佳的能量分辨率工作，只有在时间上隔离良好的光子，在直接冲突的需要，高速率测量的要求。我们描述了一个新的分析程序，允许拟合的脉冲高度的所有光子，即使在存在重脉冲堆积。在孤立脉冲的限制下，该技术简化为长记录的标准最优滤波。我们采用合理的近似噪声协方差函数，以使多脉冲拟合计算上可行的，即使是很长的数据记录。该技术被用来分析X射线发射光谱在600 eV和6 keV的速率高达每秒250计数的微热计具有指数信号衰减时间约为1.2毫秒。
英文摘要：
Transition edge sensor microcalorimeters can measure x-ray and gamma-ray energies with very high energy resolution and high photon-collection efficiency. For this technology to reach its full potential in future x-ray observatories, each sensor must be able to measure hundreds or even thousands of photon energies per second. Current "optimal filtering" approaches to achieve the best possible energy resolution work only for photons well isolated in time, a requirement in direct conflict with the need for high-rate measurements. We describe a new analysis procedure to allow fitting for the pulse height of all photons even in the presence of heavy pulse pile-up. In the limit of isolated pulses, the technique reduces to the standard optimal filtering with long records. We employ reasonable approximations to the noise covariance function in order to render multi-pulse fitting computationally viable even for very long data records. The technique is employed to analyze x-ray emission spectra at 600 eV and 6 keV at rates up to 250 counts per second in microcalorimeters having exponential signal decay times of approximately 1.2 ms.
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