MICE Tracking Detectors
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Transcript of MICE Tracking Detectors
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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.