High rate at 18 deg

Goals

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
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

(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

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"?)

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