Difference between revisions of "CDET scintillator test"
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| − | + | = Test setup = | |
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| + | Setting up the hardware and DAQ required for the scintillator test project. | ||
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| + | == 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. | ||
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| + | <br> | ||
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| + | 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 | ||
| + | |||
| + | <br> | ||
| + | |||
| + | 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. | ||
Revision as of 16:41, 24 June 2014
Test setup
Setting up the hardware and DAQ required for the scintillator test project.
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.
