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The Mu2e Solenoids

The Mu2e Solenoids. Introduction The role the solenoids play in the Mu2e experiment Baseline Solenoid Design Building Interfaces. Michael Lamm for the Mu2e Collaboration. Value Engineering Review February 14, 2013. What is Mu2e and why do it?. Look for Charged Lepton Flavor Violation

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The Mu2e Solenoids

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  1. The Mu2e Solenoids • Introduction • The role the solenoids play in the Mu2e experiment • Baseline Solenoid Design • Building Interfaces Michael Lamm for the Mu2e Collaboration Value Engineering Review February 14, 2013 Mu2e Solenoids

  2. What is Mu2e and why do it? • Look for Charged Lepton Flavor Violation • Measure the Rare Process: m- + N  e- + N relative to garden variety m- + N  nuclear capture • It will be world class experiment in the “Intensity Frontier” • Single particle sensitivity goal of 10-17 : 4 orders of magnitude improvement • Judged by P5 Committee to be a high priority for Fermilab and US HEP • …either with or without a signal…. • WITH: Indicate new physics beyond the “standard model” • WITHOUT: Put severe limits on theories beyond the standard model • It will compliment LHC Direct Observation Experiments • Technically Challenging but very do-able • Very interesting project! Mu2e Solenoids

  3. Mu2e Strategy (m-+P e-+P) • Start with high intensity, 100ns wide pulse of 8 GeV protons • Create a beam of high intensity, low momentum m- • Transport m- beam to target • Filter out debris along the way • Stop muonsin a target: form muonic atom • If/when rare reaction occurs: • Outgoing electron has signature mono-energetic 105 MeV signal distinct from background noise m 105 MeV e- Mu2e Solenoids

  4. Transport Solenoid (TSu,TSd) 8 GeV P Three Solenoids for Mu2e • Sign/momentum Selection • Negative Axial Gradient in straight sections to suppress trapped particles • Detector Solenoid (DS) • Production Solenoid (PS) 8 meters • 8 GeV P hit target. Reflect and focus p/m’s into muon transport • Strong Axial Gradient Solenoid Field • Graded field to collect conv. e- • Uniform field for e-Spectrometer 24 meters

  5. Solenoids and Supporting Infrastructure Above ground “mu2e building” • Production Solenoid (PS) • Transport Solenoid (TSu,TSd) • Detector Solenoid (DS) • Cryogenic Distribution Below ground “detector hall” • Power Supply/Quench Protection • Cryoplant

  6. Production Solenoid Concept Features: • Weight ~ 30 Tonnes • Cryostat dimension: 2 m diameter x 4.5 m long • 3 coils “3-2-2” layers • Mechanically supports Heat and Radiation Shield (HRS) • Fitting in place once PS in final location 4.6T 2.5 T Axial Gradient

  7. Transport Solenoid • TS1,TS3,TS5: Straight sections with axial gradient • TS2/TS4: approximate toroidal field • Accomplished by 55 solenoid rings of different amp-turns TS2 TS1 • Two cryostats: TSU, TSD • ~20 Tons each • ~100 Tons axial force between TSu/PS , TSd/DS Rotatable Collimator, P-bar window TS3 • Coil fabrication similar to MRI coils TS4 TS5 Mu2e Solenoids

  8. Detector Solenoid Concept Spectrometer Section Gradient Section • 40 Tons, 2.5 m diameter, 11 m long, operating current ~6kA • 11 coils in total • Axial spacers in Gradient Section • Spectrometer section made in 3 sections to simplify fabrication and reduce cost • Coil fabrication similar to PS • Aluminum Stabilizer NbTi • Outer aluminum support structure for each coil sized for expected hoop stress Mu2e Solenoids

  9. Building-Related Issues • Physical space of the solenoids • Lowering solenoids to detector level, aligning • Solenoid’s frame attachment to floor • Routing of cryogenic/power/instrumentation piping • Surface level floor space for cryo feed boxes, power converters, and instrumentation Mu2e Solenoids

  10. Physical Space for Solenoids PS Hatch Instrumentation/Service Trench SC Link Chase Mu2e Solenoids

  11. Moving of Magnets Into Place • Each solenoid has stainless steel “feet” which form interface to floor • Each solenoid arrive at building on flatbed truck • PS • Offload with single purpose crane into hatch • Rolled on rails with Hilman rollers • DS/TS • Truck backs into building, lifted off with 2 30-Ton cranes in tandem, lowered to detector level • Guided to final place on rail system and building crane • Each magnet has metal frame bolted to floor of hall • Magnets aligned • Magnets bolted into floor frame Mu2e Solenoids

  12. Moving in the Solenoids 30/60 T Crane for one time-lowering of PS/HRS Mu2e Solenoids

  13. Physical Space for Solenoids Lowered down the hatch: along rails to final destination Mu2e Solenoids

  14. Moving TS/DS cryostated magnets With 2-30 Ton crane: off load, transport over pit, lower PS/TS arrive on flatbed truck Mu2e Solenoids

  15. Magnetic and Gravitational Forces Mu2e Solenoids

  16. TS Example: Attaching Magnets to Floor Mu2e Solenoids

  17. Routing of Cryogenic Piping • Each solenoid will have a “link” between the cryostat and the cryogenic distribution box • Routed to minimize “line of sight” around cryostat, around ground floor and experiment floor • Minimize number of bends • Minimize interference with other experiment elements/crane coverage • Place close to wall to minimize accidental damage Mu2e Solenoids

  18. Cryo distribution lines Dist. Line connects to cryostat Surface-Detector level Chase Mu2e Solenoids

  19. Cryo distribution lines Dist. Line connects to cryostat Mu2e Solenoids

  20. Floor Space for Infrastructure Feed box and chase Instrumentation racks Power converters Mu2e Solenoids

  21. Solenoid Summary • Occupies a large percentage of building • Require significant infrastructure • Present building design seems to meet requirements Mu2e Solenoids

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