Speaker
Description
The ASHIPH (Aerogel – SHifter - PHotomultiplier) threshold Cherenkov counter system [1] is considered as an option for the particle identification system of the Super Tau-Charm Facility (STCF) in China [2]. To meet the requirements for separation of pions and kaons with momenta up to 3 GeV/c at high load (6 ns between beam collisions), the use of silicon photomultipliers (SiPMs) and the use of wavelength shifters (WLS) with decay times of the order of several nanoseconds is being considered. The use of SiPMs is motivated by their high photon detection efficiency (up to 40-50%), low supply voltage and immunity to magnetic fields.
To test these WLSs, a test bench was developed which is an ASHIPH counter prototype with a SiPM NDL EQR15. The counter also implements a straight light collection method, which allows it to be used without an external trigger. The relative non-uniformity of PDE was measured for the linear array of SiPMs used in this prototype. The counter was first tested on the “Extracted Beams” installation of the VEPP4-M accelerator complex with the BBQ wavelength shifter. The results of processing the experimental data, such as amplitude and timing characteristics of the ASHIPH counter prototype with BBQ wavelength shifter, are presented.
References
1. Onuchin A.P. et al. Nucl. Instr. Meth. A 315 517 (1992)
2. H.P. Peng, Y.H. Zheng and X.R. Zhou, “Super Tau-Charm Facility of China”, Physics 49, no.8, 513-524 (2020) doi:10.7693/w120200803
