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Advanced Design and Performance of the CDF Shower Maximum Detector

This document outlines the design, calibration, and performance of the CDF Shower Maximum Detector, developed by Alon Attal at UCLA. The detector effectively measures electromagnetic shower positions, distinguishes between electromagnetic and hadronic showers, and utilizes a combination of scintillating strips and wavelength-shifting fibers. With 6400 strips and a compact multi-anode phototube design, it achieves high granularity and reliable particle identification. The results indicate strong correlations between shower maximum energy and EM calorimeter energy, showcasing its operational potential in high-energy physics experiments.

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Advanced Design and Performance of the CDF Shower Maximum Detector

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  1. Plug Shower Maximum Detector for CDF Run II Alon Attal University of California Los Angeles - CDF Calor2002

  2. Outline Introduction Design Calibration Performance Conclusions

  3. Intro to CDF Shower Maximum Detector Purpose • EM shower position measurement • Distinguish EM / Hadronic showers Detector Properties • Scintillating strip / wavelength shifting fiber detector • 2 layers • 6400 5mm wide strips • Embedded ~6 radiation lengths into EM cal • 1.1 < |h| < 3.5 Endplug cross section (top half)

  4. Criteria Strip layout with following properties: Maximize granularity Maximize fiducial volume Light yield at least 1 photoelectron/MIP Understand strip response to < 10% Solution Scintillator: Bicron BC408 WLS Fiber: Kuraray Y11-350 ppm PMT: Hamamatsu R5900-M16 3 pe/MIP Achievable with moving radioactive source calibration Design: Criteria and Solution Crossing Angle = 45°

  5. Shower Max Wedge

  6. Multi-Anode Phototube (MAPMT) Hamamatsu R5900M-16 3rd generation MAPMT Desirable Features: Compact Low x-talk 416 used Low h gain: 5x105 High h gain: 1x105

  7. Moveable Co60 source irradiates each strip. Test beam shows source to particle response well correlated. 3 iterations of strip sourcing Corrections MAPMT HVs Pixel to pixel gains Energy Scale Calibration Particle Response Source Response

  8. Strip to strip energy consistent. Strip response consistent from run to run. Detector Consistency

  9. Particle Identification Deposited energy is clustered if above threshold. Clusters from both layers combined to from electron / photon candidates. Position determined from energy centroid. Average Shower Profile Zge+e- Events Bumps at ±4 due to optical cross talk

  10. Energy Correlation Energy from Shower Maximum and EM Calorimeter are well correlated. Plot flattens out due to: • Increased shower depth • MAPMT non-linearity Shower Maximum Energy (GeV) EM Calorimeter Energy (GeV)

  11. Position Measurement Position matching ~1.5 cm limited by EM Calorimeter. Better matching achievable with implementation of forward silicon tracking. Position Comparison Between SM and EM Detectors Clusters Distance in h-f space

  12. Conclusions CDF Endplug Shower Maximum Detector successfully incorporates new technology. Detector has shown to work reliably in hadronic colliders. Future improvements forseen.

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