1. MICE Tracking Detectors Malcolm Ellis NFMCC Meeting 12th March 2006

2. Tracker Status • KEK test beam data analysis ongoing • Light yield observed in cosmic ray test at Fermilab • Results from Osaka and Fermilab analyses of KEK test beam data • Plans • Tracker construction plans • Procurement • Mechanical design • Quality Assurance • Read out system • Cryogenic system • Front end electronics • Software

3. Light Yield observed at Fermilab 2500 ppm Expectation 10.6 p.e.

4. Four Station Prototype New

5. Osaka Analysis • Original stations: • Light yield ~20% less than expectations • New (fourth) station: • Light yield ~40% less than original station • Based on V views of stations B and D • Consistent results from FNAL analysis H. Sakamoto A. Horikoshi

6. Damaged Mirrors? • FNAL mirror reflectivity set up: • Batches of fibre tested from ALL stations • New (fourth) station AND original stations • Results ALL consistent with 80% reflectivity • No evidence for poor mirroring on new station

7. Damaged fibres? • No evidence of dependence of light yield on position along fibre … • … but, need to sort out decoding problem • Also indicatesmirror ‘OK’ • Channel-to-channel response awaits finaldecoding

8. Connectors!

9. Light Loss summary • Light Yield ~20% lower than expected in original three stations • Possibly due to decoding problems (biasing event selection to include noise on pedestal) • Fourth station shows further reduction • Between 25% and 40% of that in the original three stations depending on the analysis • Connector hole misalignments • Old and new station connectors lose approximately 15% • Patch panel connectors lose an additional 20% • Analysis ongoing in both groups • Investigation of the hardware continuing • QA technique development as part of investigation • Plan to build a fifth station to test construction technique and QA procedure before construction of final trackers.

10. Procurement • Scintillating and clear fibre ordered from Kuraray • 4 Sumitomo cryocoolers ordered: • Water-cooled, indoor compressors • 20m high pressure helium hoses • Delivery soon • Parts for four 2-cassette VLPC cryostats ordered at FNAL

11. Mechanical design • Preparing for D&S review in April • Aiming to complete fifth station (check of final design, construction and QA techniques) by July. • Full production to begin in July.

12. Spot smaller than a fibre 606+/-5 Intense central area 215+/-5 Quality Assurance • Scanning stage used to position a UV LED over fibre plane. • LED excites 3HF in one fibre and CCD cameras image the fibre and mirror: • Measure light output • Check for bundling or connector threading errors • Measure transmission through mirror

13. Cryogenic System • Reliable operation at FNAL and KEK • Design updated (thermal link) • Cryostat package out for bid • Move to fabrication shortly. • Demonstrated temperature stability with the cryostat tilted by 25 degrees:

14. Front End Electronics • AFEIIt pre-production boards have arrived and are under test • TripT testing is progressing • Current first pass yield is 80% • More than enough chips for D0 + MICE + spares for both experiments. • Still a lot of critical work required on firmware for AFEIIt use in MICE: • Plans being developed by T. Hart (IIT) • Possible support from RAL (Engineers visiting on 20th and 21st March) • Test stand being setup at FNAL (IIT group) and RAL

15. Software • Simulation studies: • Station spacing • RF Background and front end electronics effect on pattern recognition • Reconstruction: • Currently in the process of a major upgrade of G4MICE • Working towards improved tracker reconstruction, PID. • KEK data analysis • Being performed in G4MICE • Algorithms being developed for light loss study and QA process are being incorporated into G4MICE.