Difference between revisions of "Tagger trigger timing"
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| − | <td valign="top"> | + | <td valign="top">150 ns<br></td> |
<td valign="top">cable to BCAL Trigger Supervisor (just installed by Chris)<br></td> | <td valign="top">cable to BCAL Trigger Supervisor (just installed by Chris)<br></td> | ||
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| − | <td valign="top"> | + | <td valign="top">35 ns<br></td> |
| − | <td valign="top"> | + | <td valign="top">ADC gate generation and cables to ADC crate<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td valign="top">''' | + | <td valign="top">'''310 + 150 ns'''<br></td> |
<td valign="top">'''total delay'''<br></td> | <td valign="top">'''total delay'''<br></td> | ||
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</table> | </table> | ||
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| − | Note that the photon flight time from the radiator to the BCAL detector is 125 ns, and that the RadPhi setup has | + | 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. | ||
Revision as of 13:51, 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 |
| 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.
