Tagger trigger timing

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.