Pre-commissioning 8/12/09 - 8/19/09

Water Cherenkov

Post any completed tasks and findings in HCLOG

• Check ADC cables connected to Fastbus ADC ( )
• Connect LED in one segment to AC LED pulser signal
• Program TUL for .OR. of individual PMTs (Shichijo)
• Build trigger and gate from TUL .OR. (Joerg)
• Check ADC gate timing

• Confirm all ADC signals look good on scope
• Take a few scope pictures w/emphasis on noise level

• Take data with random trigger, e.g. LED trigger:
  • Plot mean and rms of pedestal distribution as function of PMT number

• Take data with single electron trigger
  • Extract mean and sigma of single electron distribution and plot vs. PMT number

• Monitor Amplifier Offset stability
  • Take pedestal data every day

• Check signals on Splitter
  • Set scope to 5mV/div
  • Set scope trigger to -5mV
  • Set scope acquisition to sample (~500 events)
  • Record average pulse height for signal above scope trigger

Bucking Coil Test

The following need to be working before starting this:

• HKS Dipole ready to power
• LED pulser system for the one segment with LED
• Scalers, either visual or VME

Tasks:

• With HKS Dipole at 0 A
  • Measure rate on each PMT with low discriminator threshold (10 mV)
  • Take one run with LED on.
  • Take one run with LED trigger but LED disconnected (pedestal run)
• Power HKS Dipole to 1065 A
  • Measure rate on each PMT with low discriminator threshold (10 mV)
  • Take one run with LED on.
  • Take one run with LED trigger but LED disconnected (pedestal run)
• With HKS Dipole at 1065 A, repeat above measurement for a sequence of bucking coil currents: 0.5 A, 1.0 A, 1.5 A, 2.0 A, 2.5 A, 3.0 A
  • Finish data with 2 more runs, Ibc=0 A & Ihks=1065 A, and Ibc=0 A & Ihks=0 A
  • Analyze data and plot for each PMT rate normalized to Ihks=0.
  • Determine region of maximum recovery.
  • If necessary redo BC current scan with finer steps in region of interest.