cubic scintillator test

• Purpose
  • Checking the operation of the cubic scintillator
  • It was in 446, not used for months.

• Setup
  • cubic scintillator
    • placed in the blackbox
    • 
  • HV supplied by CAEN HV power supply
    • -1000 V (ch 0)
    • 
  • DAQ - Oscilloscope
    • PMT output is directly connected to the oscilloscope
    • trigger level: -176 mV
    • a signal
      • width ~ 25 ns
      • height ~ 400 mV
      • 
  • Muon signal?
    • When HV is less than 700 V, no signal observed.
    • Signal rate looks high. Is it normal?