1. Summary of final results from MICE note: “ MICE Scintillating Fibre Tracker Prototype - First progress report - ” M.Yoshida (Osaka Univ.) for the SciFi working group

2. contents of the note Describe the techniques to build SciFi tracker Describe the techniques to build SciFi tracker Demonstrate the performance with prototype Demonstrate the performance with prototype Simulate the full tracker based on the prototype results Simulate the full tracker based on the prototype results Report of safety issue, cost and schedule Report of safety issue, cost and schedule

3. MICE SciFi tracker

4. Station production Carbon-fiber station body Fiber sheet (1500 3HF fiber)

5. The first prototype of SciFi tracker Scifi stations Top (station C) X and V view Middle (station B) X,V,W view Bottom (station A) X and W view ~80 cm X view W view V view

6. Waveguide Connection bundle of 18 clear fibers (4meter long, 1.05mm  ) bundle of 7×18 clear fibers 126 channel in each conduit

7. Readout system for prototype (D0 test stand) VLPC VLPC QE~80% for 3HF spectrum QE~80% for 3HF spectrum Gain ~ 50,000 Gain ~ 50,000 Operating temp. ~9K Operating temp. ~9K AFE (516 channels) AFE (516 channels) 8 MCM (64 channels in each) 8 MCM (64 channels in each) SVX (Sample&Hold / Degitize) SVX (Sample&Hold / Degitize) SASeq (Stand-Alone Sequencer) SASeq (Stand-Alone Sequencer) VB Program on MS- Excell VB Program on MS- Excell 3HF spectrum 500nm 700nm

8. Effect of radio-frequency noise on the electronics Determine the response of the readout electronics to RF power leaking from the cavities and the power supplies Determine the response of the readout electronics to RF power leaking from the cavities and the power supplies In the worst case, the pedestal width increased by 0.5 ADC counts or approximately a count of 0.033 photo-electrons In the worst case, the pedestal width increased by 0.5 ADC counts or approximately a count of 0.033 photo-electrons RF OFF RF ON 200MHz

9. Tracking Pedestal/Common mode subtraction Pedestal/Common mode subtraction Fiber hit threshold >1p.e. Fiber hit threshold >1p.e. Cluster > 2 p.e. Cluster > 2 p.e. Search triplet hits in Station B Search triplet hits in Station B Search duplet hits in Station A and C Search duplet hits in Station A and C Pattern recognition Pattern recognition Straight track Straight track Typical cosmic-ray event A B C

10. Prototype performance (Light yield) 3HF concentration (ppm) Most probable light yield (p.e.) 2500 10.49 ± 0.15 3500 10.32 ± 0.12 5000 8.89 ± 0.06 8.89 ± 0.06 3HF concentration in station B X view 5000ppm W view 3500ppm V view 2500ppm

11. Prototype performance (II) Efficiency Efficiency Measured  > 99% Measured  > 99% 3HF Concentration (ppm) Measured Efficiency (%) Expected Efficiency (%) 250099.73 ± 0.16 (stat.)99.72 (10PE) 350099.29 ± 0.25 (stat.)99.72 (10PE) 500098.09 ± 0.39 (stat.)98.62 - 99.38 (8-9PE) Position resolution Position resolution 442 ± 4 (stat) ± 27 (syst)  m 442 ± 4 (stat) ± 27 (syst)  m Expected : 424 – 465  m Expected : 424 – 465  m Dead channel Dead channel Definition; fewer hits above 4 p.e. Definition; fewer hits above 4 p.e. 2 channels / 1008 = 0.2% 2 channels / 1008 = 0.2% D0 fiber tracker case : 0.25% D0 fiber tracker case : 0.25%

12. Performance of the full tracker The performance of the tracker has been studied using the G4MICE package The performance of the tracker has been studied using the G4MICE package Input : G4BeamLine with RF background Input : G4BeamLine with RF background Simulation based on the results of the prototype Simulation based on the results of the prototype Results  Malcolm ’ s talk Results  Malcolm ’ s talk  x = 376  m  pt =1.28 MeV/c

13. Safety and integration No active components in the tracking volume No active components in the tracking volume No cryogen or oxygen for VLPC system No cryogen or oxygen for VLPC system The cryogenic system will be based on a closed-cycle refrigerator, a cryocooler The cryogenic system will be based on a closed-cycle refrigerator, a cryocooler Cryocooler system will be tested in 2005 KEK beam-test Cryocooler system will be tested in 2005 KEK beam-test A prototype patch panel will be fabricated and tested for vacuum integrity and stability under pressure A prototype patch panel will be fabricated and tested for vacuum integrity and stability under pressure

14. Cost The MICE scintillating-fibre tracker cost was estimated The MICE scintillating-fibre tracker cost was estimated Loan of VLPC system from FNAL-D0 will reduce the cost ~ 1M$ Loan of VLPC system from FNAL-D0 will reduce the cost ~ 1M$ Issue of 14 July, 2004

15. Schedule 4th station is now building to confirm techniques to build final tracker module 4th station is now building to confirm techniques to build final tracker module 4-station prototype is planned to be exposed to KEK-PS test beam with SC solenoid in the summer of 2005 4-station prototype is planned to be exposed to KEK-PS test beam with SC solenoid in the summer of 2005 2004200520062007

16. Summary Prototype tracker has been successfully constructed Prototype tracker has been successfully constructed 3 stations + VLPC readout 3 stations + VLPC readout No effect of RF noise was measured on VLPC system No effect of RF noise was measured on VLPC system Tracking on the prototype works well Tracking on the prototype works well Most probable Light yield = 10.49 ± 0.15 (p.e.) (3HF2500ppm) Most probable Light yield = 10.49 ± 0.15 (p.e.) (3HF2500ppm) High Efficiency : more than 99% High Efficiency : more than 99% Few dead channel : 2 / 1008 channels Few dead channel : 2 / 1008 channels Performance of the full tracker is estimated using simulation based on results of the prototype Performance of the full tracker is estimated using simulation based on results of the prototype