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EMC Trigger for Particle Physics Experiments: Requirements and Functionality Overview

This document provides a comprehensive overview of the EMC Trigger system for the EMC Group in the context of particle physics experiments. It covers the trigger requirements, signal characteristics, functionality at Level 0 and CTB/EMC, algorithm details across different layers of DSM boards, and the day one implementation plan. The document delves into aspects such as energy thresholds, jet patches, geometric considerations, and the role of SMD data, culminating in a detailed discussion on refined jet finding and full tracking for effective data processing in high-energy physics experiments.

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EMC Trigger for Particle Physics Experiments: Requirements and Functionality Overview

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  1. STAR-EMC Trigger A. Vander Molen for the EMC Group

  2. Requirements of EMC Trigger • Trigger on events with • Jets • Direct ’s • Electrons • High Etprocesses • Neutral Energy • Isospin Ratios • Calibration • and produce • Luminosity bits

  3. Signal Characteristics • Jets - Energy concentrated in 0.8x0.8 Patches • Di-jets - High Et • Direct  ‘s - Energy concentrated in single .05x.05 Towers • Di- ‘s - High Et • Electrons -Energy concentrated in single .05x.05 Tower • SMD insensitive to hadronic matter • High Et - Total Energy over threshold • Ratio of EMC to CTB

  4. Input Signals To Level 0 • 300 6 bit Barrel PMT trigger towers (.2 x .2) • 300 6 bit Barrel PMT highest tower (.05 x .05)

  5. Level 0 Functionality • Convert all energy to E - Transverse • Generate Etotal • Generate 1.0x0.8.0 non overlapping patches (Jet tower) • Compare Etotal to 3 thresholds • Compare Etotal to 3 thresholds (Luminosity) • Compare Jet tower to 3 thresholds • Compare High tower to 3 thresholds • Generate High tower to Trigger tower correlation.

  6. Level 0 CTB/EMC Functionality • EMC/CTB energy/multiplicity ratio

  7. Interim Output Bits • Total Etotal 3 bit(1 bit/threshold) • Jet tower 6 bits (2 bit counter/threshold) • High tower 6 bits (2 bit counter/threshold) • High /trigger tower 2 bits(2 bit counter) • Luminosity 3 bits Barrel (1 bit/threshold) • Patch energy 8 bits

  8. Electronics • 35 DSM boards (30+4+1) • 2 VME crates with 18 slots • Modified DSMI boards • 12 twisted pair differential inputs(FEE output) • 128 TTL output (DSM input)

  9. Algorithm • Layer 1 of DSM boards • Transform E to E transverse • High tower 3 thresholds • Trigger tower 3 thresholds • High tower/ Trigger tower • Partial Energy Sum • Output • Energy Sum 8 bits • High tower 3 bits • Trigger Tower 3 bits • Ratio 1bit

  10. Algorithm - continued • Layer 2 of DSM boards • Form Jet patches • Jet thresholds • Partial Total Energy • Output • Energy Sum 8 bits • High tower 3 bits • Trigger Tower 3 bits • Ratio 1 bit • Jets 3 bits

  11. Algorithm - continued • Layer 3 of DSM boards • Total Energy • Total Energy thresholds • Form Geometric Bit sums • Generate output bits • Output • Trigger bits

  12. Day One Implementation • 10% of Detector or 30-40 12 bit inputs. • (5 +1 ) DSM boards

  13. Level 1,2 and Level 3 • Level 1 Not implemented • Level 2 • Refined Jet finding • Overlapping patches • Geometric Considerations • SMD data • Level 3 • Full Tracking

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