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Signal Processing for Pico-second Resolution Timing Measurements

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arxiv 0810.5590 v1 pith:QHOLWE5E submitted 2008-10-30 physics.ins-det hep-ex

Signal Processing for Pico-second Resolution Timing Measurements

classification physics.ins-det hep-ex
keywords signaldiscriminatorsphoto-detectorspico-secondprocessingresolutionelectronicsfast
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The development of large-area homogeneous photo-detectors with sub-millimeter path lengths for direct Cherenkov light and for secondary-electrons opens the possibility of large time-of-flight systems for relativistic particles with resolutions in the pico-second range. Modern ASIC techniques allow fast multi-channel front-end electronics capable of sub-pico-second resolution directly integrated with the photo-detectors. However, achieving resolution in the pico-second range requires a precise knowledge of the signal generation process in order to understand the pulse waveform, the signal dynamics, and the noise induced by the detector itself, as well as the noise added by the processing electronics. Using the parameters measured for fast photo-detectors such as micro-channel plates photo-multipliers, we have simulated and compared the time-resolutions for four signal processing techniques: leading edge discriminators, constant fraction discriminators, multiple-threshold discriminators and pulse waveform sampling.

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