Revision as of 09:42, 23 November 2023

High rate at 18 deg

Goals

• SPD PID study (need photon samples)
• ECal PID study (charged electron and pion samples)
• We need to study LASPD timing

Test Conditions

• 18 degree test was done during deuteron photo-disintegration experiment
• target: varies; current: up to 70uA

Run Information

• The 18 deg run was carried out from Feb. 20 to March 20, 2023.
• Mike's run list:
  • run list google spreadsheet
  • runs divided into conditions: google slides
• Detector layout:
  • Schematic layout with detector sizes: pdf ppt
  • Jimmy's record: beam_test_table_measurements_18_degree.pdf
  • Shower prototype PMT information (gain vs. HV): HV_JLab_prototype.xlsx from Ye Tian (China)
• Jixie's online run list on redmine: online run list June 2022 - Jan 6, 2023; Jan 11 - Feb 19, 2023; Feb 20 - March 18, 2023
• Jixie's cable and HV map on redmine
• Survey (alignment) report dated 04/06/2023
• Dosimeter reading report on redmine
• 2022 Beam Test Redmine page

List of Suggested Technical Notes

• (Mike/Jimmy) alignment and layout
• (Mike) radiation dosimeter reading
• (Mike) Runlist (4 plots static for 18 deg linking to dynamic plots, also including 82 and 7 deg), including rates
• (Darren+someone) Cherenkov analysis
• (Mike/Zhiwen) summary of rates from preCDR work for each detector (to compare with our beam test)
• (Jixie) data cooking, pulse finding, integration and deconvolution
• (Ye) clean sample events – what types of runs to use and how to define them
• (Carter) LASPD timing extraction, including "edge-finding" algorithm in decoder

High rate at 7 deg

Goals

• Rates here were too high for proper PID analysis. We focused on carbon foil (and other thin) targets, and asked 5uA dedicated beam time for 20 minutes a week to check out the system. HVs were kept off during high luminosity running.
• main goal will be to make sure detectors all work properly
• Data may be useful to characterize limit of the detectors (under what situation would the detector signal "saturate"?)

Test Conditions

• The 7 deg run was carried out from January to February 2023, during XEM2 experiments
• Target information:
  • from Dave Gaskell:
    • 3He: T=5.6 K, P=55 PSI, density=0.041 g/cm3 -- 3He started out around 100 PSI before the leak
    • 4He: T=5.6K P=110 PSI, density=0.129 g/cm3
    • Both targets 10 cm long (nominal)
  • From Nadia Fomin:
    • carbon target: 0.574 g/cm^2 +/- 0.002 (edited)
  • Xiaochao comment: So 3He is slightly thinner than carbon, and 4He is about twice as thick

Run Information

• Jimmy's record of detector layout:
  • beam_test_table_measurements_7_degree.pdf
• Dosimeter reading report