Difference between revisions of "Level-1 Trigger"
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=== Reviews and Meetings === | === Reviews and Meetings === | ||
<big> [http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX-Online-Workshop-2009 Trigger Workshop, 8 July 2009 ] | <big> [http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX-Online-Workshop-2009 Trigger Workshop, 8 July 2009 ] | ||
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| + | <big> [http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX-Online-Workshop-2009 Trigger Workshop, 8 July 2008 ] | ||
Revision as of 10:56, 9 December 2011
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 tape, 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 reduce 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.
