Difference between revisions of "Tagger trigger timing"
From GlueXWiki
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<td valign="top">20 ns<br></td> | <td valign="top">20 ns<br></td> | ||
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Note that the photon flight time from the radiator to the BCAL detector is about 100 ns, and that the RadPhi setup has 250 ns delay cables (straight, or 80+170 using a patch panel). | Note that the photon flight time from the radiator to the BCAL detector is about 100 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 then we will need additional delay unless the photon flight time is more than 110 ns. The flight time is around 100 ns so 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). | ||
Revision as of 08:59, 17 July 2006
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 |
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 about 100 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 then we will need additional delay unless the photon flight time is more than 110 ns. The flight time is around 100 ns so 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).
