Tagger trigger timing
From GlueXWiki
Below is tagger trigger timing information I got from Eugene Pasyuk. Note that cables are trimmed so the sum of all delays is the same for all T-counters
Delay |
Location |
25 ns |
electron flight time tagger radiator to farthest T-counter |
20 ns |
internal T-counter PMT |
50 ns |
cable to CFD |
15 ns |
internal CFD |
5 ns |
cable to L-R coincidence logic module |
5 ns |
internal L-R coincidence logic module |
10 ns |
cable to Master Or module |
20 ns |
internal MOR |
80 ns |
cable to forward carriage |
150 ns |
cable to BCAL Trigger Supervisor (just installed by Chris) |
45 ns |
internal Trigger Supervisor |
35 ns |
ADC gate generation and cables to ADC crate |
310 + 150 ns |
total delay |
Note that the photon flight time from the radiator to the BCAL detector is 125 ns, and that the RadPhi setup has 300 ns delay cables (straight, or 100+200 using a patch panel).
The trigger delay is 310+150=460 ns minus the flight time 125 ns gives 335 ns, longer than the 300 ns ADC delay cables.
See Overall tagger timing for further discussion.