Difference between revisions of "Level 1 Trigger"
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The GlueX detector will start taking data at a luminosity | The GlueX detector will start taking data at a luminosity | ||
| − | corresponding to about 10 | + | corresponding to about 10<sup>7</sup> photons per second in the photon-beam |
| − | energy range of 8.4 < | + | energy range of 8.4 ''<'' E<sub>''γ''</sub> ''<'' 9.0 GeV. The Level-1 trigger has to |
reduce the rate from electromagnetic and hadronic interactions seen | reduce the rate from electromagnetic and hadronic interactions seen | ||
by the GlueX detector to a level acceptable by a data acquisition for | by the GlueX detector to a level acceptable by a data acquisition for | ||
writing events directly to tabe, about 20 kHz. Later, the luminosity | writing events directly to tabe, about 20 kHz. Later, the luminosity | ||
| − | will be increased by an order of magnitude to 10 | + | will be increased by an order of magnitude to 10<sup>8</sup> photons per second. |
For high-luminosity runs, events accepted by the Level-1 trigger will | For high-luminosity runs, events accepted by the Level-1 trigger will | ||
be sent to the thirt level trigger at the rate which should not exceed | be sent to the thirt level trigger at the rate which should not exceed | ||
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and providing an additional rate reduction of about factor of 10. | and providing an additional rate reduction of about factor of 10. | ||
At the same time, the Level-1 trigger has to accept all multi-particle | At the same time, the Level-1 trigger has to accept all multi-particle | ||
| − | exotic meson candidates produced in the beam energy range E | + | exotic meson candidates produced in the beam energy range E ''>'' 8 GeV. |
Revision as of 17:17, 1 June 2009
Level 1 Trigger Group
- Physics: D.Doughty, A.Somov
- Electronics & DAQ divisions (JLAB): C. Cuevas, A.Gupta, M.Taylor, J.Wilson, H.Dong, E.Jastrzembski, F.Barbosa, B.Raydo, D.Abbot
Contents
Level 1 Trigger Goal
The main goal of the GlueX experiment is the search of exotic mesons produced in interactions of 8.4 - 9.0 GeV linearly polarized beam photons with a liquid hydrogen target. The beam photons are created by the 12 GeV electrons incident on a diamond crystal via bremsstrahlung process.
The GlueX detector will start taking data at a luminosity corresponding to about 107 photons per second in the photon-beam energy range of 8.4 < Eγ < 9.0 GeV. The Level-1 trigger has to reduce the rate from electromagnetic and hadronic interactions seen by the GlueX detector to a level acceptable by a data acquisition for writing events directly to tabe, about 20 kHz. Later, the luminosity will be increased by an order of magnitude to 108 photons per second. For high-luminosity runs, events accepted by the Level-1 trigger will be sent to the thirt level trigger at the rate which should not exceed 200 kHz. The Level-3 trigger will perform an event reconstruction on a PC farm allowing to further resuce low-energy photon interactions and providing an additional rate reduction of about factor of 10. At the same time, the Level-1 trigger has to accept all multi-particle exotic meson candidates produced in the beam energy range E > 8 GeV.
Trigger Algorithm
Trigger Hardware
Reviews and Meetings
System and Integration Review, 7-9 May 2008 Review Site
Trigger Workshop, 8 July 2009 Topics for discussion
Trigger Electronics Meetings Minutes
