Difference between revisions of "Level-3 Trigger Strategy"
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This page will collect the currently planned running times/intensities for GlueX and the expected event rates. A set of requirements for the Level-3 trigger can be collected based on this information to document the design and implementation strategy. | This page will collect the currently planned running times/intensities for GlueX and the expected event rates. A set of requirements for the Level-3 trigger can be collected based on this information to document the design and implementation strategy. | ||
| − | == | + | == Phase IV Planning == |
| + | |||
| + | This is the first phase of GlueX running where the Level-3 trigger is required to reduce the even rate beyond the reduction provided in hardware by the Level-1 trigger. The nominal photon flux in the coherent peak (8.4-9 GeV) for this phase is <math>5 x 10^7</math>, which is expected to result in a Level-1 trigger rate of around 100 kHz based previous studies. Based on the event size and DAQ bandwidth expectations in Table 2 (below), the event rate to tape is limited to 20 kHz. Therefore, '''the nominal goal of the Level-3 trigger in Phase IV is to reduce the Level-1 trigger rate by a factor of 5.''' | ||
| + | |||
| + | |||
| + | == Assumptions for Level-3 Trigger Planning == | ||
| + | |||
| + | Some assumptions are necessary to plan for the requirements of the Level-3 trigger based on the expected running conditions of the experiment. Below are two tables with some assumptions for the data taking conditions for the GlueX experiment. | ||
{| class="wikitable" | {| class="wikitable" | ||
| + | |+ Table 1: Planned GlueX Running Periods (from [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2201 PAC 40 Proposal]) | ||
|- | |- | ||
! !! Phase I !! Phase II !! Phase III !! Phase IV !! Maximum Intensity | ! !! Phase I !! Phase II !! Phase III !! Phase IV !! Maximum Intensity | ||
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|- | |- | ||
| Level-1 trigger rate (kHz) || 2 || 20 || 20 || 100 || 200 | | Level-1 trigger rate (kHz) || 2 || 20 || 20 || 100 || 200 | ||
| + | |} | ||
| + | |||
| + | |||
| + | {| class="wikitable" | ||
| + | |+ Table 2: Data rate assumptions for GlueX | ||
| + | |- | ||
| + | | Event size || 15 kB | ||
| + | |- | ||
| + | | DAQ Bandwidth to tape || 300 MB/s | ||
|} | |} | ||
Revision as of 09:53, 19 August 2013
This page will collect the currently planned running times/intensities for GlueX and the expected event rates. A set of requirements for the Level-3 trigger can be collected based on this information to document the design and implementation strategy.
Phase IV Planning
This is the first phase of GlueX running where the Level-3 trigger is required to reduce the even rate beyond the reduction provided in hardware by the Level-1 trigger. The nominal photon flux in the coherent peak (8.4-9 GeV) for this phase is 
, which is expected to result in a Level-1 trigger rate of around 100 kHz based previous studies. Based on the event size and DAQ bandwidth expectations in Table 2 (below), the event rate to tape is limited to 20 kHz. Therefore, the nominal goal of the Level-3 trigger in Phase IV is to reduce the Level-1 trigger rate by a factor of 5.
Assumptions for Level-3 Trigger Planning
Some assumptions are necessary to plan for the requirements of the Level-3 trigger based on the expected running conditions of the experiment. Below are two tables with some assumptions for the data taking conditions for the GlueX experiment.
| Phase I | Phase II | Phase III | Phase IV | Maximum Intensity | |
|---|---|---|---|---|---|
| Approved PAC days | 30 | 30 | 60 | 200 | 0 |
| Minimum electron energy (GeV) | 10 | 11 | 12 | 12 | 12 |
| Photon flux in coherent peak (photon/s) |  |
 |
|
|
|
| Expected total hadronic event rate (kHz) | ?? | ?? | 36 | 180 | 360 |
| Expected hadronic event rate in coherent peak (kHz) | ?? | ?? | 0.8 | 8 | 16 |
| Level-1 trigger rate (kHz) | 2 | 20 | 20 | 100 | 200 |
| Event size | 15 kB |
| DAQ Bandwidth to tape | 300 MB/s |
