Difference between revisions of "Overall trigger timing"
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Below is my current understanding of the trigger timing for the BCAL test: | Below is my current understanding of the trigger timing for the BCAL test: | ||
| − | <table> | + | |
| − | <tr> | + | <table width="100%" border="1"> |
| − | </tr> | + | |
| + | <tr> | ||
| + | <td>'''Time'''<br></td> | ||
| + | <td>'''What'''<br></td> | ||
| + | <td>'''Comment'''<br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>0 ns<br></td> | ||
| + | <td>electron hits tagger foil<br></td> | ||
| + | <td><br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>120 ns<br></td> | ||
| + | <td>photon hits BCAL<br></td> | ||
| + | <td>BCAL is a few feet upstream of alcove<br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>220 ns<br></td> | ||
| + | <td>BCAL PMT signals reach discriminators<br></td> | ||
| + | <td>20 ns in PMT plus 80 ns cable<br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>250 ns<br></td> | ||
| + | <td>discriminator sum outputs available<br></td> | ||
| + | <td>30 ns a guess, but must be delayed before final AND in any case<br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>310 ns<br></td> | ||
| + | <td>Tagger MOR reaches final AND logic<br></td> | ||
| + | <td><br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>310 ns<br></td> | ||
| + | <td>discriminator sums reach final AND<br></td> | ||
| + | <td><br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>325 ns<br></td> | ||
| + | <td>result of final AND reaches trigger supervisor<br></td> | ||
| + | <td><br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>370 ns<br></td> | ||
| + | <td>internal trigger supervisor<br></td> | ||
| + | <td><br></td> | ||
| + | </tr> | ||
| + | |||
| + | <tr> | ||
| + | <td>385 ns<br></td> | ||
| + | <td>gate reaches ADC crate<br></td> | ||
| + | <td><br></td> | ||
| + | </tr> | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | |||
</table> | </table> | ||
Revision as of 15:46, 20 July 2006
Below is my current understanding of the trigger timing for the BCAL test:
| Time |
What |
Comment |
| 0 ns |
electron hits tagger foil |
|
| 120 ns |
photon hits BCAL |
BCAL is a few feet upstream of alcove |
| 220 ns |
BCAL PMT signals reach discriminators |
20 ns in PMT plus 80 ns cable |
| 250 ns |
discriminator sum outputs available |
30 ns a guess, but must be delayed before final AND in any case |
| 310 ns |
Tagger MOR reaches final AND logic |
|
| 310 ns |
discriminator sums reach final AND |
|
| 325 ns |
result of final AND reaches trigger supervisor |
|
| 370 ns |
internal trigger supervisor |
|
| 385 ns |
gate reaches ADC crate |
