LAr20 Goals & Plans Integrated R&D Plan Development
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Transcript of LAr20 Goals & Plans Integrated R&D Plan Development
LAr20 Goals & PlansIntegrated R&D Plan Development
Bruce BallerNovember 23, 2009
Director's Review of LAr Integrated Plan, Nov 23, 2009
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Outline
• LAr20– TPC basics– Participants– LAr20 reference design parameters– Detector concepts & short term plans
• R&D Plan Development– The historical plan– Risk analysis– Additions to the historical plan
Director's Review of LAr Integrated Plan, Nov 23, 2009
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Active LAr20 Institutions• BNL – Cryogenics, TPC, cold electronics• Indiana – Cryostat, cryogenics• FNAL – Cryostat, cryogenics, cavern & infrastructure,
installation planning, warm electronics, physics R&D• Michigan State – Cold electronics• Minnesota – Installation planning• Tufts – Physics R&D• UCLA – TPC, HV feedthrough• Yale – TPC, Physics R&D ~30 active participants
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LAr20 Conceptual Design Options– Membrane cryostat is attractive if evacuation is not required
• Effective use of the excavated cavern volume• Design used in LNG tankers of volume ~10x LAr20• Over 200 tankers in service since 1970• ~CD2 level costing information received from mfg
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1m of foam glass instead of foam panels
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Alternatives for CD1
Modular Soup Can
Cryostat configuration Modular cryostat is our backup if evacuation IS required
Less effective use of excavated volume than membrane Soup Can configuration – Not considered for CD1
Standard tank construction for above-ground application Non-standard cavern excavation
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Cryostat Options Costing
$48
$50
$52
$54
$56
$58
$60
$62
$64
Series1
20kt Scaled Cost
$M
Excavation & outfitting cost ~$800/m3
LAr cost ~$1k/kton Membrane cryostat cost ~$2k/m2
TPC, electronics, etc cost not included
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Membrane CryostatCross Section
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Cryostat “Kit” Components
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Labor Estimates
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Tools for InstallationAutomatic welding machineResin mixing machineGluing machines
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Proposal Cost Estimate
Proposal cost estimate is proprietary
Cost ~$2k/m2 w 30% UG labor premium, FNAL technicians
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GEOSTOCK Pilot PlantSouth Korea
“Underground Storage of LNG in Mined Rock Cavern”, Nicolas Gatelier, IGRC, Paris 2008
Membrane cryostat
Constructed & operated in 2003 – 2005
Proposing a 200 kton LNG storage plant
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LAr20 Reference Design #1
• Fiducial mass = 1/6 of 100kt Water Cherenkov 16.7kt (LAr20)– Size ~20m x ~20m x ~40m
• Drift distance 2.5m• 2 or 3 wire planes, wire spacing = 3 - 5 mm
– Cost-benefit decision (ne ID efficiency, NCpo rejection)
– ~500k channels for 2 wire planes with 5mm spacing
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Reference Design #1TPC Concept
2.5m
2.5m
Cathode Plane
Wire Planes Start with the design and cost estimate of
the MicroBooNE TPC module (~10m long).
Increase the width of the wire planes to 4mAdd mirror module
4m
4m
11m
Pre-assembled wire planes4m x 10m x ?cm
Shipping box fits in Yates supercage
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Depth Options for CD1
• 300 level – n oscillation physics, pdk? , SN n’s?– Drive in access
• 4850 level - n oscillation physics, pdk, SN n’s– Shaft access
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Cavern Cost Study
• The LAr20 cavern concept has a 20m deep pit– Not the “standard” DUSEL lab module
• DUSEL has dropped development of the 300 level• We are conducting a cost study to address these
uncertainties– Managed by Chris Laughton (FNAL mining engineer &
LAr20 system manager)– Request for Proposal issued in October to mine
engineering consultants– Currently reviewing 4 proposals
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Cryo Engineering Consultants
• Contract with Arup for– Conceptual design of membrane cryostat– Conceptual design of modular cryostat– Conceptual design of cryogenics plant
• Arup capabilities (w Linde sub-contract)– Conceptual design of >20 LNG cryogenic & cavern
storage facilities– He and H2 liquefier systems– Under contract with DUSEL
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Cryo Plant Concepts
• LN2 cooling system– Surface or UG– Re-liquefy N2– LN2 tracer in cryostat(?)
• Heat load– 20kw cryostat + 20kw
electronics– ~400kw power
consumption
Note: This layout inaccurate to meet purity requirements
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Cold (87K) Electronics Concept Cosmic Ray Test Stand
CMOS tests Edwards (Michigan State)
CMOS ASIC Development & testing Radeka, Rescia (BNL) Yarema (FNAL) Cressler (Georgia Tech)
Integration, grounding Marvin Johnson (FNAL)
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LAr20 Readout Scheme
Event FilterRaw Data Rate: ~200 GB/s (384 Mbps X 5.5k)Event Filter will receive optical signals, de-multiplex, decompress and find useful events, then send to Event Builder/DAQ FarmData Rate to Event Builder: ~200 MB/s (200GB/s X 10 X 0.0001)
H. Chen - BNL
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LAr20 Short Term Plan• The first cost estimate for the LAr20 Reference Design #1
should be available in Feb– Arup conceptual designs of the cryostat options & cryogenics plant
complete– LAr20 team goal: Complete the cost estimate for the Reference
Design #1– Cavern cost study completed(?)– FNAL does first pass estimate of ODH mitigation
• Calculation of the fiducial volume for Reference Design #1 can feasibly be available in Feb
• We will have a CD-1 level estimate of cost per kton of fiducial volume
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R&D Plan Development
• “Historical” (ca 2005) plan– Test stands & experiments (next 2 slides)
• Development of the proposed plan– Methodology
• Risk identification risks that are not being addressed by the historical plan
• Risk classification level of importance• Risk mitigation Propose new R&D activities /experiments
– Analysis done by the Integrated Plan development group over an intense 3 month period
– This Director’s Review is the first external airing of the plan
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The Historical Plan
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The Historical Plan
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Integrated Plan Development Group
• Flavio Cavanna (L’Aquila)• Ornella Palamara (Gran Sasso)• Bruce Baller (FNAL)• Bonnie Fleming (Yale)• Cat James (FNAL)• Rob Plunkett (FNAL)• Stephen Pordes (FNAL)• Gina Rameika (FNAL)• Brian Rebel (FNAL)• Jon Urheim (Indiana)
Un ringraziamento speciale
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Risk Identification• Assume that all R&D activities in the Historical Plan are
successful– ArgoNeuT is taking data, ~10k neutrino interactions, will publish QE
cross sections– Analysis code developed for 3D reconstruction of tracks and showers– LAPD demonstrates long electron lifetime without first evacuating
the cryostat– MicroBooNE publishes results from 100k sample of neutrino
interactions, demonstrates long electron lifetime without first evacuating the cryostat
• What risks remain that might prevent successful operation of LAr20?
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Risk Classification
0 1 2 3
3 Low Med High High
2 Low Low Med High
1 Low Low Low Med
Consequence Ranking
Likelihood Ranking
Consequence Ranking ThresholdVery High 3 Significant delay (>1 yr), cost impact > $10MModerate 2 Moderate delay (>3 mon), cost impact > $1MLow 1 Minor delay (<3 mon), cost impact < $1M
Likelihood Ranking ThresholdVery Likely 3 >90% probabilityLikely 2 50% - 90% probableUnlikely 1 1% - 50% probableVery Unlikely 0 <1% probable
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Category Post MicroBooNE Potential ProblemConse
quenceLikelihood Risk Mitigation
Mitigated Likelihood
Mitigated Risk
Argon PurityAchievement of adequate lifetime requires evacuation. (MicroBooNE and/or LAPD were not successful)
3 1 MedKeep modular cryostat as an option 0 Low
Argon Purity Cannot achieve required drift length 3 1 Med Develop QA procedures 0 Low
Argon Purity
Argon purity immediately following filling is poor requiring several volume recirulations before operations can begin
1 3 Med 3 Med
Argon Purity
Increasing the drift distance is a low impact method of reducing the cost of LAr20, however drift distances >2.5m may not have been demonstrated
2 1 Low 1 Low
Cryogenics The cryostat develops a leak during operation. 3 0 Low 0 Low
CryogenicsExtrapolation from LNG experience/design to LAr is invalid or not understood adequately
3 1 MedEngineering analysis will mitigate this
0 Low
Electronics"Hot electrons" at 87K damage the cryogenic ASIC's over the lifetime of the detector with a loss of >50% of the detector channels
3 1 MedPerform stress test on ~5% of LAr20 channel count 0 Low
ManagementSuppliers are unable to deliver the needed quantities of cryogens on the schedule needed for filling
2 1 Low 1 Low
ManagementCritical components have a single supplier - procurement & operations
2 0 LowThere is already an R&D plan in place
1 Low
ManagementThere are insuffi cient technical resources to conduct the planned and proposed R&D
2 3 HighIncrease FNAL resources
2 Med
ManagementThere are insuffi cient scientific resources to conduct the planned and proposed R&D
2 3 HighSolicit additional collaborators
2 Med
Mitigation Notes
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Category Post MicroBooNE Potential ProblemConse
quenceLikelihood Risk Mitigation
Mitigated Likelihood
Mitigated Risk
Physics R&DThere is no intermediate scale detector between MicroBooNE and LAr20
1 1 Low 1 Low
Physics R&DNo calibration exists to allow a determination of EM and hadronic shower energy
1 3 MedDo a test beam calibration. Use ArgoNeut?
0 Low
TechnicalIf drift distances >2.5m are required, the required HV cannot be achieved
3 1 MedOperate a HV feedthrough prototype
0 Low
TechnicalMovement of long unconstrained wires creates noise in the detector
2 0 LowSP: would like a small test on long wires, in LN2 or dirty LAr
0 Low
Underground issues
The detector costs is significantly higher than expected
3 2 HighTrack costing during prototyping
1 Med
Underground issues
The cost of deployment at the deep underground site is significantly higher than expected
2 2 Med
Dry mockup to simulate installation. ~10% size of LAr20. Using Arup for UG design & estimating
1 Low
Underground issues
The ODH risk is not estimated correctly or the ODH mitigation plan is not properly constructed 3 1 Med
Perform an independent review of FNAL ODH methodology & plan
0 Low
Mitigation Notes
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Calibration testCryostat prototypeInstallation/Integration prototypeElectronics stress testHV feedthrough prototypeReview of FNAL cryo safety std
Proposed new R&D Activities
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Final Comments
• The proposed set– Reduces risks to an acceptable level– Is cost effective– Takes into consideration our understanding of
schedule and resource constraints• Subsequent talks will detail the risks in each
category and the mitigation plan