Metalica TestPulseoutput 12-21-07

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12/21/07

The scope pictures show the PREamp output on Channel 2 given the input pulse shown on Channel 1 that is input directly onto the sense wire.

Metalica 40mVpulserInputOnSenseWire PostampOuput 12-21-07.jpg
Metalica 60mVpulserInputOnSenseWire PostampOuput 12-21-07.jpg


The CAEN N470 power supply was used to establish voltages onthe drift chambers. A SHV tee was used to allow a single HV channel from the CAEN power supply to power both chambers in parallel. The Drift chamber voltages settings were set according to the table below. The current column indicates the total current drawn from both chambers.

HV settings
Wire Volts current ([math]\mu[/math]A)
Sense 1500 19
Field -800 19
Guard 800 0


The Drift Chamber sense wire #4 (center sense wire) output is shown on channel 1 in the the scope pictures below. The POSTamp output is shown on Channel 2. There appears to be a factor of 10 gain when the drift chamber output is amplified by the peramp - postamp system which differs from the attenuation measured why injecting a pulse?


Metalica HV1500-800 Sensewire PostampOuput 12-21-07.jpg
Metalica HV1500-800 Sensewire PostampOuput 12-21-07 A.jpg
Metalica HV1500-800 Sensewire PostampOuput 12-21-07 1.jpg


Now we looked at signals from the Drift chamber sense wire #4 in coincidence with the top scintillator paddle. The scintillator paddle output has been delayed by 100 ns.

Metalica HV1500-800 SenseWire4 Coin ScintTop 12-21-07 1.jpg