Difference between revisions of "MiniPrototype CosmicRuns"
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==12/27/07== | ==12/27/07== | ||
| − | Run | + | Run 207: |
Scope picture of a Cosmic Coincidence event triggered by and AND between the top and bottom scintillator. | Scope picture of a Cosmic Coincidence event triggered by and AND between the top and bottom scintillator. | ||
[[Image:CosmicCoincidence_12-27-07_MetalicaCh1.jpg |200px]] | [[Image:CosmicCoincidence_12-27-07_MetalicaCh1.jpg |200px]] | ||
| + | |||
| + | Drift Chamber turned on with 90/10 ArCO2 and the voltages below | ||
| + | |||
| + | {| border="1" |cellpadding="20" cellspacing="0 | ||
| + | |colspan= "3" | HV settings | ||
| + | |- | ||
| + | | Wire || Volts || current (<math>\mu</math>A) | ||
| + | |- | ||
| + | |Sense || 1500 || | ||
| + | |- | ||
| + | |Field || -800 || | ||
| + | |- | ||
| + | |Guard || 800 || | ||
| + | |} | ||
| + | |||
| + | [[Image:CosmicCoincidence_r207.jpg |200px]] | ||
| + | |||
| + | ==12/28/07== | ||
| + | |||
| + | Run 208: | ||
| + | |||
| + | Increased Gate width from 200 ns to 800 ns after realizing that the drift chamber pulses could be that wide. I also removed the 100 ns decay line on sense wire #4 of both chambers. The PMT pulses still have a 100 ns delay line in. | ||
| + | |||
Drift Chamber turned on with 90/10 ArCO2 and the voltages below | Drift Chamber turned on with 90/10 ArCO2 and the voltages below | ||
Revision as of 17:36, 30 December 2007
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 (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 (A) |
| Sense | 1500 | 19 |
| Field | -800 | 19 |
| Guard | 800 | 0 |
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 2/3 of the cosmics seen by the Scintilaltors.
12/27/07
Run 207:
Scope picture of a Cosmic Coincidence event triggered by and AND between the top and bottom scintillator.
Drift Chamber turned on with 90/10 ArCO2 and the voltages below
| HV settings | ||
| Wire | Volts | current (A) |
| Sense | 1500 | |
| Field | -800 | |
| Guard | 800 | |
12/28/07
Run 208:
Increased Gate width from 200 ns to 800 ns after realizing that the drift chamber pulses could be that wide. I also removed the 100 ns decay line on sense wire #4 of both chambers. The PMT pulses still have a 100 ns delay line in.
Drift Chamber turned on with 90/10 ArCO2 and the voltages below
| HV settings | ||
| Wire | Volts | current (A) |
| Sense | 1500 | |
| Field | -800 | |
| Guard | 800 | |