Difference between revisions of "MiniPrototype CosmicRuns"
| Line 74: | Line 74: | ||
| Wire || Volts || current (<math>\mu</math>A) | | Wire || Volts || current (<math>\mu</math>A) | ||
|- | |- | ||
| − | |Sense || 1600 || | + | |Sense || 1600 || 140 |
|- | |- | ||
| − | |Field || -850 || | + | |Field || -850 || 145 |
|- | |- | ||
|Guard || 850 || 0 | |Guard || 850 || 0 | ||
Revision as of 17:50, 27 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 |
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 (A) |
| Sense | 1600 | 140 |
| Field | -850 | 145 |
| Guard | 850 | 0 |