Difference between revisions of "Level-1 Trigger"

Revision as of 13:20, 9 December 2011

Level 1 Group Members

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 < E_γ < 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.

Level 1 Trigger Algorithm

Trigger Hardware

Reviews and Meetings

• 12 GeV Trigger Workshop, CNU, July 2010
• 12 GeV Trigger Workshop, CNU, July 2009
• Subsystems Review, JLab, May 2008

• Level-1 Trigger Meetings

Beam Tests

• Microscope Hall-B beam test, 2011
• FCAL Hall-B beam test, 2011

Test Setups

• SiPM timing measurements

Schedule and Activities

• Activities from P3E schedule

Manuals

• register map for FADC250 V2

• ADC FPGA Functional Description

• F1TDC v1.2

• FADC250 Data Format V1

• Linux discless setup

• GE XVB601 controller setup (Hall-B page)

• TI-D manual

Useful Links