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MICE Tracking Detectors

Malcolm Ellis

NFMCC Meeting 12th March 2006

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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

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Light Yield observed at Fermilab

2500 ppmExpectation

10.6 p.e.

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Four Station Prototype

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BACD

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BACD

New

5000XB

MixtureXC

5000WC

5000XA

5000WD

5000VA

3500WB

2500VB

2500VD

2500XD

3HF (ppm)VIEWSTATION

5000XB

MixtureXC

5000WC

5000XA

5000WD

5000VA

3500WB

2500VB

2500VD

2500XD

3HF (ppm)VIEWSTATION

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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

4.8(5000)8.7(5000)8.3(3500)-W view

5.0(2500)-8.2(2500)7.8(5000)V view

4.1(2500)8.4(mix)7.2(5000)8.3(5000)X view

st Dst Cst Bst Anpe(3HF ppm)

4.8(5000)8.7(5000)8.3(3500)-W view

5.0(2500)-8.2(2500)7.8(5000)V view

4.1(2500)8.4(mix)7.2(5000)8.3(5000)X view

st Dst Cst Bst Anpe(3HF ppm)

H. SakamotoA. Horikoshi

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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

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Damaged fibres?• No evidence of dependence of light yield on

position along fibre …– … but, need to sort out decoding problem– Also indicates

mirror ‘OK’

– Channel-to-channel response awaits finaldecoding

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Connectors!

Patch Panel Connector set 104

Loss of light due to fibre/ area misalignment =22.59%

Due too the fact that the fibres have a cladding approx 12% of diameter the

actual loss is

25.5%

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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.

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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

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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.

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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

606+/-5

215+/-5

Spot smaller than a fibre

Intense central area

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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:

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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

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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.