First Level Trigger review layout

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

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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

• Rates and Trigger Probability

1. Tagger
2. FCAL
3. BCAL
4. TOF
5. ST Counter

• 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

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Hardware Implementation

• Overview

1. Trigger diagram
2. Trigger types

   - hadronic trigger

   - minimum bias (Random ?)

   - CDC cosmic

   - subdetector's stand alone ( pedestals, LED (?), etc...)

• Trigger Components

1. VXS crates
2. FADC250
3. Energy Sum Board
4. Trigger Interface Module
5. SubSystem Processors
6. Tagger Energy Processor
7. Global Trigger Processor
8. Optical Links
9. Clock/Trigger/Sync distributions
10. ...

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Loading and Testing

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

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Operation Control / Online Monitor

• Online performance check

1. Energy Sum, optical links, etc.

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