HERD Prototype Beam Test PMT Trigger System and Data Tianwei Bao（鲍天威） baotw@ihep.ac.cn Institute of High Energy Physics, CAS 2016.01.20

PMT Trigger System Characteristics Functions： Self-trigger generation and PS-trigger distribution Supplementary energy measurement Beam status monitor：real-time histogram and count rate Timestamp synchronization with ICCD by PPS

PMT Trigger System Characteristics Performance： Dynamic Range：69dB 4 individual channels Trigger delay：6ns DAQ ：80MSPS×12bit Dead time：500ns

PMT Trigger System-Coupling of Fiber and PMT

Setup for the Beam Test Instrument Configuration：4 individual channels C24 cell->Trigger Fiber->PMT Anode C24 cell->Trigger Fiber->PMT Dynode 249 cells->Trigger Fiber->PMT Anode 249 cells->Trigger Fiber->PMT Dynode High Trigger Low

PMT Trigger System-PMT Driver and Pre-amplifier

PMT Trigger System-Hardware and Firmware

PMT Trigger System-DAQ and Monitor Software

Energy Measurement 100 GeV e-, 249 cells, PMT and ICCD histogram comparison Histogram comparison Synchronization by the trigger serial number

Energy Measurement e-, 249 cells: PMT DYNODE vs ICCD 50GeV e- 100GeV e- Matched by the same trigger serial number Linearity could be derived from the low energy part 150GeV e-

Energy Measurement e-, 249 cells: PMT ANODE vs ICCD 50GeV e- 100GeV e- Saturation observed PMT high voltage was not set properly in the beam test 150GeV e-

Energy Measurement e- C24 cell, PMT DYNODE vs ICCD Deviation is large 100GeV e- 200GeV e- Deviation is large Detection for 1 cell is not sensitive enough 150GeV e-

Energy Measurement 249 cells, preliminary calibration 249 cells Calibration by ICCD data Resolution : 5% @ 90GeV

Energy Measurement the C24 cell, preliminary calibration Deviation is very large Calibration by ICCD data

Energy Measurement Total 250 cells, preliminary calibration Merge calibrated PMT data from the 249 cells and the C24 cell Resolution is dependent on the deviation of C24

Self-Trigger Generation Delay between PS trigger and PMT self-trigger, 100 GeV e-

Summary Proved functions： Work in the future： Trigger generation and distribution Basic energy measurement Beam status monitoring Synchronization with ICCD by PPS Work in the future： Fixing the saturation issue Optimize the electronics to enlarge the dynamic range Noise reduction to detect the pion deposition

Thank you！ Tianwei Bao（鲍天威） baotw@ihep.ac.cn Institute of High Energy Physics, CAS 2016.01.20

Energy Measurement 50 GeV electrons vs 50 GeV positrons 50GeV e-

Energy Measurement Total 250 cells preliminary calibration Merge calibrated data from the 249 cells and the C24 cell Resolution is not reliable for the deviation of C24