Trigger Outline for May 2008

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First Level Trigger Review

Introduction

  • GlueX Physics
  • Photon Beam
  1. Tagged Bremsstrahlung
  2. Coherent Bremsstrahlung
  3. Photon spectrum
  • Trigger Design Requirements and Principle
  1. Backgrounds
  2. Trigger rate and latency
  3. Detector components used in the trigger

Trigger Simulation

  • Overview
  1. GEANT detector simulation
  2. Tagger simulation
  • Backgrounds
  1. Electromagnetic
  2. Hadronic
    -Pythia tuning
    - hadronic background region (Egamma < 8 GeV)
    - signal region (Egamma > 8 GeV)
  3. Multiple-event pileup simulation
  • Detector Responses (Distributions and Rates)
  1. Tagger
  2. FCAL
  3. BCAL
  4. TOF
  5. ST Counter
  • The Trigger Algorithm (Correlations Among Subdetectors)
  1. Operating at low luminosity (10^7)
  2. Operating at hight luminosity (10^8)
  • Trigger Efficiency
  1. Classify 'signal' decay channels based on (smth. like)
    - multiplicity of charged tracks (photons)
    - events with proton/neutron recoil

Hardware Implementation

  • Overview
  1. Trigger diagram
  2. Trigger types (?)
    - hadronic trigger
    - minimum bias (Random ?)
    - CDC cosmic
    - subdetector's stand alone ( pedestals, LED (?), etc...)
  • Trigger System Hardware Components
  1. VXS Crates (electronics review ?)
  2. FADC250 (electronics review ?)
    - Energy Sum Processing
    - Tagger 'Hit-Bit' Processing
    - ST, TOF Track-Count Processing
  3. Crate Trigger Processor (CTP)
  4. Trigger Interface Module (TI)
  5. Signal Distribution
  6. SubSystem Processors (CTP)
  7. Global Trigger Processors
  8. Trigger Supervisor
  9. Trigger Distribution (TD)

Loading and Testing

  • 250 MHz trigger system test
  • 200 kHz crate trigger test
  • FPGA programming/simulation
  • ...

Operation Control / Online Monitor

  • Online performance check
  1. Energy Sum, optical links, etc.

Time Schedule and Manpower


Related Documents

See Dave Doughty's note on the Level 1 trigger design on the GlueX DocDB: GlueX-Doc-1017-v1

Trigger Network System drawings posted by Chris Cuevas GlueX-doc-1013-v1