Difference between revisions of "Tagger trigger timing"
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| − | 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<br><br> | + | 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. This is calculated using existing cables.<br><br> |
| − | <table width=" | + | <table width="80%" cellspacing="2" cellpadding="2" border="1"> |
<tr> | <tr> | ||
| − | <td valign="top"> | + | <td valign="top">'''Delay'''<br></td> |
| − | <td valign="top">Location<br></td> | + | <td valign="top">'''Location'''<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td valign="top">25 ns<br></td> | <td valign="top">25 ns<br></td> | ||
| − | <td valign="top">tagger radiator to farthest T-counter<br></td> | + | <td valign="top">electron flight time tagger radiator to farthest T-counter<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td valign="top">20 ns<br></td> | <td valign="top">20 ns<br></td> | ||
| − | <td valign="top"> | + | <td valign="top">internal T-counter PMT<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 24: | Line 24: | ||
<tr> | <tr> | ||
<td valign="top">5 ns<br></td> | <td valign="top">5 ns<br></td> | ||
| − | <td valign="top">to L-R coincidence logic module<br></td> | + | <td valign="top">cable to L-R coincidence logic module<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 32: | Line 32: | ||
<tr> | <tr> | ||
<td valign="top">10 ns<br></td> | <td valign="top">10 ns<br></td> | ||
| − | <td valign="top">to Master Or module<br></td> | + | <td valign="top">cable to Master Or module<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| Line 40: | Line 40: | ||
<tr> | <tr> | ||
<td valign="top">80 ns<br></td> | <td valign="top">80 ns<br></td> | ||
| − | <td valign="top"> | + | <td valign="top">cable to forward carriage<br></td> |
| + | </tr> | ||
| + | <tr> | ||
| + | <td valign="top">150 ns<br></td> | ||
| + | <td valign="top">cable to BCAL Trigger Supervisor<br></td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td valign="top">45 ns <br></td> | ||
| + | <td valign="top">internal Trigger Supervisor<br></td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td valign="top">50 ns<br></td> | ||
| + | <td valign="top">ADC gate generation, cables to ADC crate, ADC internal<br></td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td valign="top">'''325 + 150 ns'''<br></td> | ||
| + | <td valign="top">'''total delay'''<br></td> | ||
</tr> | </tr> | ||
| − | |||
</table> | </table> | ||
| + | <br> | ||
| + | Note that the photon flight time from the radiator to the BCAL detector is 115 ns, and that the RadPhi setup has 300 ns delay cables (straight, or 100+200 using a patch panel). | ||
| + | |||
| + | Thus using existing cables the trigger delay is 325+150=475 ns minus the flight time 115 ns gives 360 ns, longer than the 300 ns ADC delay cables. | ||
| + | |||
| + | See [[Overall tagger timing]] for further discussion. | ||
Latest revision as of 14:16, 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. This is calculated using existing cables.
| 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 |
| 45 ns |
internal Trigger Supervisor |
| 50 ns |
ADC gate generation, cables to ADC crate, ADC internal |
| 325 + 150 ns |
total delay |
Note that the photon flight time from the radiator to the BCAL detector is 115 ns, and that the RadPhi setup has 300 ns delay cables (straight, or 100+200 using a patch panel).
Thus using existing cables the trigger delay is 325+150=475 ns minus the flight time 115 ns gives 360 ns, longer than the 300 ns ADC delay cables.
See Overall tagger timing for further discussion.
