Signal cable timing
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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.
run info
Detectors D30(Red) and D90(yellow):
run #5214 t=1475 seconds
Results
| Detector | PMT | sig. cable | Variable index* | relative to D30T001 [ns] | PMT bot - PMT top [ns] | Run # | |
|---|---|---|---|---|---|---|---|
| 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