Difference between revisions of "Signal cable timing"
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| Line 35: | Line 35: | ||
| rowspan="2" | +12.5 <!--Bottom minus top--> | | rowspan="2" | +12.5 <!--Bottom minus top--> | ||
| rowspan="4" | r5218 | | rowspan="4" | r5218 | ||
| − | | rowspan="4" | | + | | rowspan="4" | 1221 |
|- style=" border-bottom: 2px solid black" | |- style=" border-bottom: 2px solid black" | ||
Revision as of 22:47, 17 August 2016
Procedure and setup
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 2 PMT's using 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.
Detector PMT thresholds at 50 mv.
Trigger PMT threshold at 35 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 | r5218 | 1221 |
| 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 | 1106 |
| 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