Difference between revisions of "Tagger trigger timing"
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| − | <td valign="top"> | + | <td valign="top">66 ns<br></td> |
| − | <td valign="top">cable to BCAL Trigger Supervisor ( | + | <td valign="top">cable to BCAL Trigger Supervisor (just installed by Chris)<br></td> |
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| − | <td valign="top">'''280 + | + | <td valign="top">'''280 + 66 ns'''<br></td> |
<td valign="top">'''total delay'''<br></td> | <td valign="top">'''total delay'''<br></td> | ||
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Revision as of 11:54, 21 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 |
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 |
| 66 ns |
cable to BCAL Trigger Supervisor (just installed by Chris) |
| 45 ns |
internal Trigger Supervisor |
| 5 ns |
cable to ADC crate |
| 280 + 66 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).
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.
