Signal cable timing
Procedure
PMT timing relative to D30T001 is measured by splitting a pulse from a pulse generator.
PMT top-bottom difference is the mean time difference of the PMT's using data from the TDC spectrum of a coincidence run with the CF-252 source. The source was placed in the center of all detectors and 150.5 cm above the floor. The trigger detector was located 5.5 cm below the very bottom of the source.
Set up
Detector threshold at 50 mv. Trigger threshold at 30 mv.
Results
| Detector | PMT | sig. cable | Variable index* | relative to D30T001 [ns] | bottom - top [ns] | Run # | Run time [sec] | |
|---|---|---|---|---|---|---|---|---|
| angle | color
| |||||||
| 30 | Red | Top | D30T001 | 1 | +0 (by definition) | +12.5 | r???? | ?? |
| Bot | D30B002 | 2 | +12.5 | |||||
| 90 | Yellow | Top | D90T003 | 3 | +1 | +10.5 | ||
| Bot | D90B004 | 4 | +11.5 | |||||
| 150 | Blue | Top | D150T005 | 1 | +1 | +13 | r5217 | ?? |
| Bot | D150B006 | 2 | +14 | |||||
| 225 | Wood | Top | D225T007 | 3 | -3 | +23 | ||
| Bot | D225B008 | 4 | +20 | |||||
* for ROOT, e.g. evt.TDC1190[1][i], where i is the variable index.
Trigger plugged into patch panel 223A15 : -8 ns