1. KEK Analysis Report Makoto Yoshida Osaka Univ. 2006/06/10 MICE CM15

2. Contents Integration work towards G4MICE Introduction to KEK beam test We have two independent analyses –Hideyuki’s –Aron’s in the framework of G4MICE

3. KEK Beam Test KEK beam test was performed on September 30th to October 7th in 2006 at KEK-PS  2 beam line with the collaboration of UK, US, Europe and Japan. Main purpose is to confirm the performance of SciFi tracker in 1-Tesla solenoid field. Prototype SciFi tracker –SciFi tracker is consists of 4 stations, and there are 3 views for station B,D and 2 views for station A,C. VLPCs –Photon signals from Scintillating fiber were readout by VLPCs. –We used two VLPC cassettes. One of them has high gain and the other has low gain. –VLPCs were cooled down to 9K by a cryocooler. Schematic view of detectors located in the beam line Prototype SciFi Tracker with 4 Stations

4. Setup TOF hodoscope JACEE MAGNET (B=1T) Readout System Cryocooler AFE Board Low Gain Cassette High Gain Cassette Before installing waveguides BEAM  2 Beam Line

5. Sci-Fi Prototype Prototype Tracker consisted of 4 stations. Stations B & D - 3 Views Stations A & C - 2 Views Readout - VLPCs, AFEII, Cryostat. X ViewV ViewW View Station D2,500 ppm 5,000 ppm Station Amixture5,000 ppm Station C5,000 ppm Station B5,000 ppm2,500 ppm3,500 ppm

6. Event Selection To ensure that a pion surely passes through SciFi tracker, PID by TOF of D1 and D2 counter are required. Integration window in Trip chip is measured. Time difference from the beam trigger is restricted to reject events in which beam particles are not synchronized to Trip gate. STATION B STATION A STATION D STATION C D1TOFD2SciFi

7. View alignment among stations View V View X View W Station B Fiber #Residual BEAM 3 GeV/c  DCAB

8. View Alignment View V View X View W Station D Fiber #Residual

9. Search for center fiber In order to find combination of crossing of fibers of 3 views, adjustment is done by shifting X-view by same amount. –Down figure shows the results after shifting by -20 fibers. W view X view V view #101 #81

10. Pitches for Station D DATA shows fiber pitch is 420  m on all stations Inspection of 4 th Station “D” confirmed 420  m pitches. Difference of fiber# Fiber# V View X View W View Red = 427  m Black = 420  m

11. MICEModel work in G4MICE Representations of the model are produced for specific purposes (Simulation, Reconstruction, Visualisation … ). The Model allows us to have the same geometry for the Reconstruction of Data and Geant4 Simulation, so that they can be compared. Configuration files have also been implemented, which list the material, location and orientation etc. of each module in the MICEModel (TOF, SciFi … ) with respect to the other modules. Representations of the model are produced for specific purposes (Simulation, Reconstruction, Visualisation … ). The Model allows us to have the same geometry for the Reconstruction of Data and Geant4 Simulation, so that they can be compared. Configuration files have also been implemented, which list the material, location and orientation etc. of each module in the MICEModel (TOF, SciFi … ) with respect to the other modules.

12. G4MICE Status The TOF Decoding, Cabling & calibration files & code have now been written and used in G4MICE. Atsushi ’ s time walk corrections have been used and implemented into G4MICE. The TOF Reconstruction code has now been produced including “ TofSlabHits ” & ” TofSpacePoints ”. VLPC decoding used is that from Osaka (jp map 12). VLPC calibration used is that made by Malcolm in November 2005. Common Mode Noise algorithm updated (use similar technique to that described by Hideyuki). Clustering algorithm unchanged (2.0 PE total light in a cluster, neighbouring hits are summed). Space point code now takes into account arbitrary rotations and misalignments (no longer requires trackers to be perpendicular to the Z axis!). Track reconstruction used for this analysis not final one. The TOF Decoding, Cabling & calibration files & code have now been written and used in G4MICE. Atsushi ’ s time walk corrections have been used and implemented into G4MICE. The TOF Reconstruction code has now been produced including “ TofSlabHits ” & ” TofSpacePoints ”. VLPC decoding used is that from Osaka (jp map 12). VLPC calibration used is that made by Malcolm in November 2005. Common Mode Noise algorithm updated (use similar technique to that described by Hideyuki). Clustering algorithm unchanged (2.0 PE total light in a cluster, neighbouring hits are summed). Space point code now takes into account arbitrary rotations and misalignments (no longer requires trackers to be perpendicular to the Z axis!). Track reconstruction used for this analysis not final one.

13. MICEModel Set Up of KEK Test Beam T1 & R1 Counters ACC Pb Diffuser TOF Hodoscope (Blue & Green Slabs) Solenoid (White)

14. MICEModel Set Up of KEK Test Beam T1 Counter R1 Counter ACC Pb Diffuser

15. MICEModel Set Up of KEK Test Beam

16. TOF Analysis 1 Black Black: 3 GeV/c Red Red: 325 MeV/c Blue Blue: 250 MeV/c

17. TOF Selection “High P” “Low P Electrons” “Low P Muons”

19. Sci-Fi Summary 1/2 Low mom.  Low mom. eHigh mom. Station A Plane V9.518.148.00 Station A Plane X9.988.127.98 Station B Plane V9.138.217.22 Station B Plane X8.377.317.21 Station B Plane W9.748.738.58 Station C Plane X9.749.419.18 Station C Plane W11.08.768.86 Station D Plane V5.964.483.57 Station D Plane X5.985.154.49 Station D Plane W5.025.284.28

20. Light Yield –X view 8.0 0.210.2 0.2 8.9 0.3 4.7 0.2 15.0 0.418.6 0.4 8.5 0.6

21. Light Yield Summary StationView Gain of cassette 3HF concent. Light Yield 3GeV/c   Light yield 1GeV/c protons Ratio p/   BXLOW50007.915.01.9 BVLOW25008.615.61.8 BWLOW35009.816.91.7 AXLOW500010.318.61.8 AVLOW50009.115.31.7 CXHIGHmixture8.8--- CWHIGH50008.9--- DXHIGH25004.78.51.8 DVHIGH25004.89.11.9 DWHIGH50005.19.41.8

22. Beam Profile –MC and DATA Horizontal RMS (cm)Vertical RMS (cm) DATA10.0 MC10.0

23. Pt,Pz Distribution --MC Station @X viewDCAB Pt (MeV/c)28.5 (8.6)29.0 (9.7)29.4 (10.3)29.4 (10.0) Pz (Mev/c)227.2 (2.3)226.8 (2.4)226.4 (2.4)225.9 (2.4) Momentum shift can be seen due to non-uniform magnetic field upstream

24. Reconstructed Distri. --MC Reconstructed mom.DATAMC Pt (MeV/c)28.3 (10.3)30.1 (10.3) Pz (Mev/c)230.7 (26.7)233.7 (19.7) muon PT distribution PZ distribution MeV/c

25. Chi2 Distribution MC Mean 1.8 RMS 1.6 DATA Mean 2.8 RMS 2.3 DATA has little more broad distribution than MC. It could be caused by noise in DATA, mismatch of injected beam, … In this analysis, position resolution is assumed to be 1mm (should be 0.4mm)

26. Summary We have confirmed basic performance and capability to measure transverse / longitudinal momentum of low momentum muons. –Analysis on details are on the way to check two independent analyses Analysis tools integrating TOF and other beam counters are implemented in G4MICE framework. Test each stage of the Reconstruction (hits, clusters, points, tracks, matching) using the Geant4 simulation of test beam. Test Reconstruction of real data (TOF & SciFi).