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
80 ns?	cable to BCAL Trigger Supervisor (not installed yet)
45 ns	internal Trigger Supervisor
5 ns	cable to ADC crate
280 + 80 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 250 ns delay cables (straight, or 80+170 using a patch panel).

Also note that the RadPhi delay cables are 250 ns. If the trigger delay is 360 ns and given a flight time of 125 ns we are right on the edge. There are additional 170 ns delay cables in the RadPhi setup we can use if necessary (see Richard's note on RadPhi cables). We might consider cutting them in half, installing ends, and thus getting two 85 ns cables for each 170 ns cable.