Speaker
Description
To precisely measure the properties of the Higgs, W, Z bosons and explore new physics beyond the Standard Model, fast timing performance is crucial for the calorimetry of future electron-positron colliders. High-precision time-of-flight (ToF) measurements can complement dE/dx measurements and significantly improve the particle identification performance with a required TOF resolution of around 50 ps. In addition, timing measurements with a resolution at nanosecond-level can also enhance the hadronic energy resolution by approximately 3% to 4% through the local software compensation for the CALICE AHCAL.
Using 55 nm CMOS technology, a pico-second timing (PIST) front-end electronic chip with a power consumption of 15 mW (per channel) has been developed for future electron-positron collider experiments. Extensive tests have been performed to evaluate the timing performance of a dedicated SiPM-readout system equipped with a PIST chip. The results show that the system timing resolution can achieve 45 ps (24 ps) for the HPK(NDL) SiPM signals at the minimum-ionizing particle (MIP) level 200 p.e. and can reach sub 10 ps for energy depositions six times higher or more, while the PIST intrinsic timing resolution is better than 5 ps. The PIST dynamic range has been further extended using the time-over-threshold (ToT) technique, which can cover the SiPM response spanning from 900 p.e. to 40000 p.e. This low-power PIST chip can be can be a promising candidate in applications of SiPM-based detectors for fast timing at future Higgs factories.