In typical algorithms for optimally filtering transition-edge-sensor-microcalorimeter pulses, the average value of a filtered pulse is set to zero. The achieved energy resolution of the detector then depends strongly on the chosen length of the pulse record. We report experimental confirmation of this effect. We derive expressions for the dependence of energy resolution on record length, and apply them to a pair of detector models for the X-ray Microcalorimeter Spectrometer instrument on NASA/ESA/JAXA s proposed International X-ray Observatory (IXO). Although the two models have identical pulse time-constants, they differ by a factor of two in the necessary record length for a given energy resolution. Finally, we derive an expression for the maximum output count rate of a TES pixel.
Citation: AIP Conference Proceedings
Pub Type: Journals
microcalorimeter, transition-edge sensor, optimal filter, International X-ray Observatory, count rate, spectrometer