Log entry time 13:53:36 on March 16, 2009

Entry number 266507

- Feeding a discriminated pulser copy into the T2 trigger
- T2 trigger delayed at DAQ weldment to align L1A (and ADC gate) with 
  pulser correlated signal from PMTs
- regular T2 trigger restored after test

Run 2218:
  - HVs for 1--10 on, pulser on
  - LED #11, #16, #20 plugged in
    - LED drive pulse ampl. set to provide 1--2 p.e. pulse on the scope
for PMT 10
    - 1.5V w/ FWHM 15ns
  - Pedestal run
    - T8 trigger dominated (others prescaled away)

Run 2219:
  - HVs for 1--10 on, pulser on
  - LED #11, #16, #20 plugged in
    - LED drive pulse ampl. set to provide 1--2 p.e. pulse on the scope
for PMT 10

Run 2220:
  - HVs for 1--10 on, pulser on
  - LED #11, #16, #20 plugged in
    - reduced drive voltage a bit to get better spectra for PMTs 1, 2
    - 1.25V w/ FWHM 15ns

------------------------------------------------

Run 2221:
  - HVs for 11--20 on, pulser on
  - LED #1, #5, #10 plugged in
    - drive voltage 1.75V w/ FWHM 15ns
  - Pedestal run
    - T8 trigger dominated (others prescaled away)
  = ped for 17 is pretty bad

Run 2222:
  - HVs for 11--20 on, pulser on
  - LED #1, #5, #10 plugged in
    - drive voltage 1.75V w/ FWHM 15ns

Run 2223:
  - HVs for 11--20 on, pulser on
  - LED #1, #5, #10 plugged in
    - reduced drive voltage to 1.50V w/ FWHM 15ns

Run 2224:
  - HVs for 11--20 on, pulser on
  - LED #1, #5, #10 plugged in
    - reduced drive voltage to 1.25V w/ FWHM 15ns

Run 2225:
  - HVs for 11--20 on, pulser on
  - LED #1, #5, #10 plugged in
    - reduced drive voltage to 1.15V w/ FWHM 15ns

Run 2226:
  - HVs for 11--20 on, pulser on
  - LED #1, #5, #10 plugged in
    - increased drive voltage to 2.00V w/ FWHM 15ns
  - PMT 17 sucks
  = big drift in PMT performance, I'm not sure what I'm looking at...

NOTE: Apparently the cable driving LED on #5 is flaky.  Now using the cable
      that had been driving LED on PMT 10
      - Signal on PMT 17 is very noisy, but with the above change I can see
        some reasonable correlated pulses now.

Run 2227: JUNK

Run 2228:
  - HVs for 11--20 on, pulser on
    - set drive voltage to 2.00V w/ FWHM 15ns
  - pulser is unplugged from the LED on PMT 10, LED on PMT 5 is driven by 
    10s original cable
  = eureka, signal on 17... a bit too large though

Run 2229:
  - HVs for 11--20 on, pulser on
    - set drive voltage to 1.50V w/ FWHM 15ns
  - pulser is unplugged from the LED on PMT 10, LED on PMT 5 is driven by 
    10s original cable
  = PMT 17 just sucks

Run 2230:
  - HVs for 11--20 on, pulser on
    - set drive voltage to 1.50V w/ FWHM 15ns
  - pulser is unplugged from ALL LEDs
    - should be just pedestal