The high timing resolution T0 system in IHEP E3 beam line

Abstract

The designed aim of the multi-gap resistive plate chamber module (MRPC) for the BESIII endcap TOF upgrade project is less than 50 ps, so a Time-zero (T0) system is required to achieve the timing resolution at 30 ps level. After study the scintillator, the PMT, the DAQ subsystem, the assemblage form and the distributing position, the timing resolution of this type of T0 detector composed of scintillator BC420 coupling with PMT H6533 could achieve 30 ps level. Further more, the T0 could also perform the particle identification (proton and pion) just as the beam TOF and EMC detectors during the beam test process for the compelling result. For this type of T0 system, the MRPC beam test was finished and achieved a compelling result.

A novel PMT test system based on waveform sampling

“…The performance of PMT is represented by a single photon spectrum, which is obtained by measuring the amount of charge. The conventional charge calculation is by an integration of the PMT pulse signal within the gate of the NIM trigger level [6]. A signal is sent to one channel of QDC, and the trigger is sent to QDC as the gate signal.…”

The high-speed after-pulse measurement system for PMT

“…Couples of criteria are set to decide whether a PMT is eligible or not, concerning the gain, the transit time spread (TTS), the dark count rate or the dark current and so on (refs. [3,4]). After-pulse occurs some time later after the initial photoelectron signal, and cannot be distinguished from the true physical signals (ref.…”

A Study on Digital Model and Simulation Method of Pulse Doppler Fuze

“…Fuze-warhead system digital simulation test can simulate certain encounter states which are difficult to achieve in target practice experiment, avoiding the problem of high cost. With the development of computer technology, full digital simulation has gradually approach practical targeting process, and become one important means for researching in fuze-warhead system design [1][2][3].…”