CPP Beam Test Feb. 2019

Beam test to measure effect of shielding near beamline on TOF trigger rates

• Feb. 20-21, 2019
• Log entries
• Runs: 60897-60916
• Radiator: JD70-105 47um PERP
• TOF/FCAL position: "Current location plus 48" in Z (plus or minus an inch or two)" -- from Tim W. e-mail to Elton on 3/26/2019
• Shielding (from log entry 3656916)
  • We have used two sheets of shielding.
  • Each sheet consists of 2 sheets of Pb sandwiched between two layers of Al.
  • The thickness of Pb is 4.5-4.6 mm (0.80-0.84 rad len)
  • The thickness of Al is 2x1.6 mm = 3.2 mm (0.04 rad len)
  • Total radiation lengths is 0.86 +/- 0.02 radiation lenghts per sheet.
• Sheets should be 60cm x 60cm with a 12cm x 12cm beam hole (this was the request. I couldn't find a final number)

List of runs
============================
Run 60897: CPP test, no shield, 100 nA
Run 60898: CPP test, no shield, 30 nA
Run 60899: CPP test, 1 sheet, 50 nA
Run 60900: CPP test, 1 sheet, 50 nA
Run 60901: CPP test, 1 sheet, 70 nA
Run 60902: CPP test, 1 sheet, 100 nA
Run 60903: CPP test, 1 sheet, 30 nA
Run 60904: CPP test, 2 sheets, 30 nA
Run 60905: CPP test, 2 sheets, 70 nA
Run 60906: CPP test, 2 sheets, 100 nA
Run 60907: CPP test, 2 sheets, 50 nA
Run 60908: CPP test, 2 sheets, empty target, 30 nA
Run 60909: CPP test, 2 sheets, empty target 50 nA
Run 60910: CPP test, 2 sheets, empty target, 70 nA
Run 60911: CPP test, 2 sheets, empty target, 100 nA
Run 60912: CPP test, no shield, 100nA, Target: Empty
Run 60913: CPP test, no shield, 30nA, Target: Empty
Run 60914: CPP test, no shield, 50nA, Target: Empty
Run 60915: CPP test, no shield, 70nA, Target: Empty
Run 60916: CPP test, no shield, 50nA, Target: Empty