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Performance Overview of TOF and ACC for Prototype Test at Osaka University

This document outlines the essential components and requirements for the Time of Flight (TOF) and Aerogel Cherenkov Counter (ACC) systems in the prototype test scheduled for May. Key aspects include achieving 50ps time resolution in high magnetic fields, effective m/p/e separation, and accurate momentum measurement for low momentum muons in Phase II. Performance checks for both TOF and ACC from the KEK-PS T577 experiment are highlighted, including expected light yields and momentum resolution metrics. Future discussions will focus on design and performance evaluations.

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Performance Overview of TOF and ACC for Prototype Test at Osaka University

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  1. TOF/ACC testOverview M. Yoshida Osaka Univ.

  2. TOF / ACC in the prototype test • For the prototype test in May, we will need PID: • TOF counter • Distinguish m/p/p/e with 50ps time resolution in high magnetic field ~ 2kGauss • Long light guide to keep proper PMT gain • Absolute momentum measurement for low momentum muons in PhaseII • Aerogel Cherenkov Counter (ACC) • Distinguish m/p by thershold • Distinguish m/e by photon yield • High photon yield is required • Check the performance of TOF and ACC • Survey low momentum beam (muon yield) • KEK-PS T577 from Feb.1 to Feb.7, 2005

  3. m/p separation by TOF • Assuming • s upstream =50ps • s downstream =60ps • sTOF=sqrt(50^2+60^2)=78ps •  3s separation @ 600MeV/c • Momentum resolution • ~10MeV/c @ 350MeV/c

  4. Expected ACC light yield Momentum: 0.5GeV/c Refractive index: 1.03 p.e.

  5. Setup (KEK-PS T577)

  6. Time resolution ⇒σ(ref)=42.03ps σ(tof)=49.08ps

  7. PID by TOF and ACC 0.6Gev/c 0.5Gev/c e ACC pulse height m ~10% p Time of flight

  8. Next talks • TOF design & performance • Atsushi Horikoshi • ACC design & performance, and Beam property • Ken’ichi Sakai

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