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Comprehensive Overview of LBNE LAr Detector Prototyping and Plans at Fermilab

This document outlines the prototyping plans for the LBNE Liquid Argon (LAr) detector, detailing the design parameters and technical specifications necessary for constructing a successful 1 kton prototype at Fermilab. Key features include the structure of detector modules, cryostat designs, heat load management, and purity monitoring systems. Various engineering challenges, such as achieving argon purity and the reliability of electronics for a 20-year lifetime, are also discussed. This comprehensive plan serves as a crucial step towards larger-scale physics experiments utilizing LAr technology.

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Comprehensive Overview of LBNE LAr Detector Prototyping and Plans at Fermilab

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  1. LAr1 Plans at FNAL Bruce Baller - Fermilab

  2. Outline • LBNE LAr detector overview • Prototyping plan • 1 kton prototype LAGUNA Meeting - Mar 2011

  3. LBNE, LArTPC, 300L – 800L Plan Ramp From 300L to 800L Yates Shaft Kirk Portal Existing 800 Level Existing 300 Level Utility Shafts To Surface LArTPC Cavern 2 LArTPC Cavern 1 Ross Shaft

  4. SITE PLAN Access Ramp Access Portal Utility Shaft Access Portal, Cryogenics Building Cavern Existing 800 Level Existing 300 Level Ross Shaft LAGUNA Meeting - Mar 2011

  5. CR Veto CR Veto 2.5m 7m Membrane Cryostat Mounting Rails CR Veto Anode Plane Assembly (168) Field Cage Cathode Plane Assembly (224) LAGUNA Meeting - Mar 2011

  6. Cold Electronics Analog ASIC Tested LAGUNA Meeting - Mar 2011

  7. Reference Design - Key Parameters • One detector module • 2 high x 3 wide x 26 long = 168 Anode Plane Assemblies (APA) • APA  3840 instrumented wires @ 3mm wire spacing (5mm?) • Four wire planes: Grid, Induction 1, Induction 2, Collection • 2.5m drift (3.5m?) • 16.7 kton fiducial mass, 20 kton active mass, 25 kton total mass • Heat load = 31 kW insulation + 12 kW electronics + 6(x4) kW LAr pump ~ 50 kW  0.5 MW power consumption (cooling!) • Light detection system? - A “desirement” • Two detector modules in one cavern – 34 kton • Cavern 184m x 24m x 25m LAGUNA Meeting - Mar 2011

  8. Issues & Prototyping Plan • Achieving argon purity without vacuum pumping • Liquid Argon Purity Demonstrator (LAPD) • Achieving argon purity in a membrane cryostat • 3m x 3m wall panel • Leak testing • LAPD  35 ton prototype (purity monitors) • Engineering and integration prototype • 3 – 4 full scale APAs, 6 – 8 CPAs, field cage, full readout chain • “1 kton prototype” = SBL LAr1 (Project Manager opinion) • Electronics reliability • 20 year lifetime design rules for150 mm CMOS process, stress test LAGUNA Meeting - Mar 2011

  9. 3m x 3m Membrane Cryostat Wall Panel Panel built at Samsung (Korea) • Compare He sniffing and ammonia calorimetric leak checking • Max dp across membrane if we need to vac pump • Under construction at Fermilab • GTT visit next week LAGUNA Meeting - Mar 2011

  10. LAPD • 10’ dia x 10’ high SS tank • 2x20cm, 2x50cm purity monitors, RTD’s • Test in summer 2011 LAGUNA Meeting - Mar 2011

  11. 35 Ton Prototype • 3m x 3m x 3m membrane cryostat • Use LAPD cryogenics system and instrumentation • Side benefit: prototype cryostat procurement • Engineering – Arup • Procurement & Construction – Fermilab or construction management firm LAGUNA Meeting - Mar 2011

  12. “1 kton Prototype” Example • 1.2 kton LAr total • 730 ton active • 3.8m drift • 6 kW cooling req’d Attractive site 11.5m • DZeroAss’y Hall pit • Use DZero calorimeter cryo system, ODH system 16m 11.5m LAGUNA Meeting - Mar 2011

  13. DAB Pit 14m x 21m floor 18m depth LAGUNA Meeting - Mar 2011

  14. Prototype or Physics Experiment?My Understanding • “Physics experiment rules” • Fermilab: Experiment proposal approved by the director after consideration by the Physics Advisory Committee • Time… • DOE: Detector constructed using capital equipment funds if the cost exceeds $5M  project management structure (CD-0, etc) • Time & money… • “Prototype rules” • DOE: Constructed using R&D funds • Under the aegis of the parent project • A Utopian vision • Fermilab constructs a LAr TPC test facility that just happens to be located in a neutrino beam LAGUNA Meeting - Mar 2011

  15. Backup Slide – Light Collection 128 nm g TPB Light detector – MPPC? 460 nm g Acrylic plate TPB • Doc 3303, “Demonstration of a Lightguide Detector for Liquid Argon TPC’s”, arXiv 1101.3013 • Key result: Observe 7 – 8 pe from 5.3 MeV a in LAr using a cryogenic PMT. (Expected 10 pe). 50 cm < attenuation length < 200 cm 15 LAGUNA Meeting - Mar 2011 LAr WG Mtg - Dec 2010

  16. Backup Slide – Veto Drifts LAGUNA Meeting - Mar 2011

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