MiniPrototype CosmicRuns

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Revision as of 18:14, 27 December 2007 by Oborn (talk | contribs) (→‎12/27/07)
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Cosmic Coincidences

setup

Setup a cosmic coincidence experiment with two crossed scintillators that have the proto-type drift chambers sandwhiched between them.

Built 4 100 ns long delay cables. 2 for the PMTs and one for sense wire 7 on each of the drift chambers.


The top PMT is in channel 7 of the QDC and channel 16 of the scaler.

The Bottom PMT is on channel 8 of the QDC and channel 7 of the scaler.

Coincidence counts are recorded in channel 2 of the scaler.

Runs

Drift Chamber is off

Run 182: Ran with coincidence module in "OR" mode so if either paddle triggered the ADC was read out

Run 183: Switched coincidence module to "AND" mode and ran overnight.

12/23/07

Drift Chamber turned on with 90/10 ArCO2 and the voltages below

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

Run 204: Scope was plugged into DC output (split signal)

12/24/07

Run 206: Unplugged scope and started this run


Drift Chamber turned on with 90/10 ArCO2 and the voltages below

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


Run206 12-25-07.jpg

I had a bad ribbon cable on plastica. Ignore the results for Plastica. It was just a good pedestal measurement.


It looks like Metalica saw 3/5 of the cosmics seen by the Scintilaltors.

12/27/07

Run 207: Unplugged scope and started this run


Drift Chamber turned on with 90/10 ArCO2 and the voltages below

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


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