Revision as of 11:55, 28 June 2014

Test setup

Setting up the hardware and DAQ required for the scintillator test project.

CODA setup

• Working on computer wm122 under account adaq ( which uses usual password)
• Created script /home/adaq/coda_user_setup_bash to define CODA 2.6 variables. This script is sourced by .bash_profile .
• The msql daemon must be running. Chcek by command ps -ef | grep -i msqld . It should return the process number for the msqld.
• The CODA database is wmtest. The eeltest database is being used by yer122
• To start up CODA ( right now do not use startcoda script) run this command in separate terminal windows
  • et_start ( note that if it gives error message try deleting files /tmp/et_start*)
  • rcplatform
  • coda_eb_rc3 -i -n EB1 -t CDEB
  • coda_er_rc3 -i -n ER1 -t ER
  • the roc process is started when the CPU ( a1nccvme ) in the VME crate is booted.
  • rcgui
• To start taking data from the rcgui interface
  • SESSION=wmtest and CONFIG=KAeel122 should be selected.
    • Note that if you update the CODA database, the COOLHANDS database needs to be updated.
  • From menu select Connect
  • Click on the Config button. EB1, ER1 and ROC1 should be configured.
  • Click on the Download button. EB1, ER1 and ROC1 should be downloaded.
  • Click on the "Start" button to do a Prestart and Go. One can also first click on the Prestart button and then the Go button.

June 24, 2014

Set up most of the modules required to collect data; gate generator still needs to be hooked up after the level 1 alert is sent from the computer. Important information includes:

• Threshold of top finger was set to -40 mV in an octal discriminator.
• Threshold of bottom finger was set to -50 mV in the same octal discriminator, different port.
• Threshold of the WLS/bar was set to -10 mV (to be double checked) in a separate 16-channel discriminator.
• Bottom finger signal is delayed by 12.5 ns, relative to the top finger signal, passing from the discriminator into the logic module (so that coincidence timing depends on the bottom finger). 12.5 ns offset allows sufficient buffer against spread in incoming logical signal times due to analog signals of different magnitude.

A model V792 ADC is used. Signals from each PMT pass into the ADC in the following channels:

• Channel 1 -> Top finger
• Channel 2 -> WLS/bar
• Channel 3 -> Bottom finger

The fingers are each hooked to a Philips XP2282/B PMT, while the WLS/bar is hooked to a Philips XP2262/B PMT (to be double checked). The fingers share a common HV supply. Each HV supply is held at -1700 Volts.