1. KEK Beam Test Koji YOSHIMURA KEK MICE Collaboration Meeting 2004.10.28 Koji YOSHIMURA KEK MICE Collaboration Meeting 2004.10.28

2. Review and updated information TBD Items Tracker Configuration Plane interval Compatible Phase 2.5??? Beamline Layout Trigger Mechanical (base, rotator, etc.) PID TOF (Atsushi Horikoshi) Aerogel Software (Katsuya Yonehara) Review and updated information TBD Items Tracker Configuration Plane interval Compatible Phase 2.5??? Beamline Layout Trigger Mechanical (base, rotator, etc.) PID TOF (Atsushi Horikoshi) Aerogel Software (Katsuya Yonehara) Contents

3. Perfomance check to finalize design Light yield, Efficiency, Noise Pattern Recognition Momentum measurement Calibration (alignment) Mesurement Emittance prove to determine by 0.1% accuracy Perfomance check to finalize design Light yield, Efficiency, Noise Pattern Recognition Momentum measurement Calibration (alignment) Mesurement Emittance prove to determine by 0.1% accuracy Objective

4. S-JACEE Magnet B=1T 1 week life Beam B=1T

5. π 2 Beamline

6. Slow extracted 2 sec Flat top 10 mm R.M.S Yield of Pion10^5 10^5 @ 1 GeV/c 10^3 @ 0.4 GeV/c Slow extracted 2 sec Flat top 10 mm R.M.S Yield of Pion10^5 10^5 @ 1 GeV/c 10^3 @ 0.4 GeV/c BEAM Condition Two Beam Periods 2005 May 1week 2005 Jul 1week Two Beam Periods 2005 May 1week 2005 Jul 1week

8. Longer than BESS Mag Bottle-neck shaped bore restrict acceptance Longer than BESS Mag Bottle-neck shaped bore restrict acceptance Jacee Magnet

9. Stray Field

10. Basic performance check Confirmation of cosmic-ray run with new VLPC cryostat light yield comparison of fiber concentration VLPC vs PMT Minimum ionizing - Defocus beam position resolution (Alignment error) Minimum ionizing - Defocus beam Inclined beam (detector be tilted) multiple scattering - material thickness momentum/angle dependence various momentum Basic performance check Confirmation of cosmic-ray run with new VLPC cryostat light yield comparison of fiber concentration VLPC vs PMT Minimum ionizing - Defocus beam position resolution (Alignment error) Minimum ionizing - Defocus beam Inclined beam (detector be tilted) multiple scattering - material thickness momentum/angle dependence various momentum 1st Phase High intensity beam

11. 1st Phase beam

12. 1st Phase Trigger

13. Plane spacing? Curvature resolution Spiral Angle 41degree for 1T 1m Field Uniformity

14. L=96cm w/ MS Pt distribu tion vs L L=72cm w/ MS L=48cm w/ MS L=96cm w/o MS L=72cm w/o MS L=48cm w/o MS

15. Precision Measurement w/ magnetic field Track finding/Pattern recognition relatively low p beam (0.3 ~ 0.6 GeV/c) Inclined beam Generate Pt using degrader/diffuser Momentum resolution Evaluated with 4 identical station External Momentum measurement TOF hodoscope? Lpath = 12 m, σ TOF=50ps dp/p = 1%? Better if PID is available Position calibration during DAQ w/B field Precision Measurement w/ magnetic field Track finding/Pattern recognition relatively low p beam (0.3 ~ 0.6 GeV/c) Inclined beam Generate Pt using degrader/diffuser Momentum resolution Evaluated with 4 identical station External Momentum measurement TOF hodoscope? Lpath = 12 m, σ TOF=50ps dp/p = 1%? Better if PID is available Position calibration during DAQ w/B field 2nd Phase Good quality Low p beam?

16. 2nd Phase Beam

17. 2nd Phase Trigger

18. 2nd Phase

19. Momentum by TOF muon pion

20. Requirement of high timing resolution to PID PID of μ/π @ sigma=50ps ・ ~700MeV/c PID>3σ ( >99.7% ) To reject π σ<50ps needed Atushi Horikoshi

21. Simulation of TOF Timing resolution of shorter light guide is better ・ Evaluation of timing resolution to the length of light guide ・ Scintillator n=1.58 ・ Light guide n=1.52 ・ Fine mesh PMT (R6504S)

22. 2.5” Finemesh PMT could be borrowed from BESS Group? 20 PMT’s for TOF, 16 PMT’s for Aerogel 2.5” Finemesh PMT could be borrowed from BESS Group? 20 PMT’s for TOF, 16 PMT’s for Aerogel Possible Detectors 5x5 hodoscope

23. Aerogel N=1.034 Pthd 403 MeV/c for mu 530 MeV/c for pi to be used for electron possibly some fraction of pi Aerogel N=1.034 Pthd 403 MeV/c for mu 530 MeV/c for pi to be used for electron possibly some fraction of pi PID?

24. Scenario should be confirmed. Tracker configuration Beam line detectors Mechanical issues VLPC Electronics DAQ Scenario should be confirmed. Tracker configuration Beam line detectors Mechanical issues VLPC Electronics DAQ Summary