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Status of Mu2e Solenoids

Status of Mu2e Solenoids. Organization Technical Progress Cost and Schedule. Michael Lamm for the Mu2e Project. Working Group Meeting March 17, 2010. Mu2e Goals. Measure the Rare Process: m - + N  e- + N relative to m - + N(A,Z)  n + N(A, X)

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Status of Mu2e Solenoids

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  1. Status of Mu2e Solenoids • Organization • Technical Progress • Cost andSchedule Michael Lamm for the Mu2e Project Working Group Meeting March 17, 2010

  2. Mu2eGoals • Measure the Rare Process: m- + N  e- + Nrelative tom- + N(A,Z)  n + N(A, X) • Goal: 4 orders of magnitude increase in sensitivity over previous experiments • How to do it: • Create a beam of high intensity, low momentum “in time” muons • Stop muons in aluminum target: form muonic atom • Turn experiment off for 700 nS to suppress “in time” background • Precisely measure mono-energetic electrons emitted from muon recoil from an Aluminum stopping target • Magnets role in Mu2e • Focus, momentum select and transport of m- from primary target • Gradient field in transport to prevent out of time other particles from reaching stopping target • Provide a uniform stable field for the final captured electron spectrometer m 105 MeV e-

  3. Transport Solenoid 8 GeV P • Graded field to collect conv. e- (2T1T) • Uniform field for e-Spectrometer (1T) • Production Solenoid Solenoid System • Sign/momentum Selection • Negative Axial Gradient in S.S. to suppress trapped particles ~0.2 T/m PT CC • 8 GeV P hit target. Reflect and focus p/m’s into muon transport • Strong Axial Gradient Solenoid Field 5T2.5T e- Spectrometer ST • Detector Solenoid Working Group Meeting

  4. Magnet Procurement Strategy Fermilab will act as a “General Contractor”: • PS and DS will likely be built in industry • Need to develop a strong conceptual design and technical specifications for vendors • Final engineering design done by industry • Similar strategy for most detector solenoids • TS will likely be designed/built “in house” • Cryostat, mechanical supports built by outside vendors • Coils wound in-house or industry depending on technology choice • Final assemble and test at Fermilab • Solenoid task has responsibility for all interfaces • Significant magnet coupling between PS-TS and TS-DS • Tight mechanical interfaces • Cryoplant, power supplies, instrumentation… Working Group Meeting

  5. Mu2e Functional and Interface Specifications for Solenoid Sub-system Working Group Meeting Iron Shielding Iron Shielding Proton Beamline Absorber Tracker and Calorimeter Absorber Collimator Stopping Target Beam Dump Beam Dump Target TSn TSn TSn TSn PS DS Building/ Mechanical Feedbox Vacuum Denotes interface spec co-responsibility Cryoplant Powering Quench Prot./Instr. Denotes functional + interface spec responsibility

  6. WBS Structure Where we are now Fabrication Phase Install and Commission Working Group Meeting

  7. Conceptual Design WBS Org Chart • Most of team is in place • Present Level of Effort • Engineering 5.0 FTE • Designers 1.5 FTE • Proj. Management 0.75 • Off project Scientists 2.0 Significant input and collaboration from outside of Solenoid Task: Rick Coleman Peter Limon Jim Miller Jim Popp Project Management… Working Group Meeting Mechanical Design Oversight Vadim Kashikhin Magnetic Design Oversight Nikolai Andreev Integration Rodger Bossert 1.5.2 Conceptual Design • Michael Lamm (L2) • Tom Page (L2 Project Engineer) 1.5.2.1 Production Solenoid • Vadim Kashikhin Nikolai Andreev Igor Novitski V. Pronskikh R. Rabehl 1.5.2.6 Power System • Sandor Feher • Walt Jaskierney (PPD) 1.5.2.2 Transport Solenoid • Giorgio Ambrosio Nikolai Andreev Dan Evbota Mau Lopes 1.5.2.5 Cryoplant Design • Jay Theilacker Group (AD) 1.5.2.7 Quench Protection • G. Ambrosio • M. Lamm 1.5.2.3 Detector Solenoid • Ryuji Yamada Masayoshi Wake Bob Wands Group (PPD) 1.5.2.8 Tooling Concepts (Tom Page) 1.5.2.4 Cryogenic System • Tom Nicol • Tom Peterson • Jeff Brandt 1.5.2.9 Installation Concepts (Tom Page)

  8. Engineering Challenges • PS/TS/DS: three separate magnet designs but….. • Coupled together magnetically • Really ONE Big Magnet • Significant Forces (~100 Tons on end of DS from TS) • Tight physical tolerances • Cold vs. Warm , with field excitation • Particularly with odd shaped TS • Integration issues • It is our job to makes sure magnets built from different vendors, fit together, produce the required magnetic field Working Group Meeting

  9. SSC cable Copper Bar MECO (BNL) vs. Mu2e Magnet Concept Working Group Meeting

  10. Production Solenoid Challenges • Large Volume : Aperture (1.8 m), Length ~5 m • High field (5.6 T on NbTi) • Large Amount of Stored energy (100 MJ) • Asymmetric forces on ends (unlike HEP detector solenoids) • 8 GeV Target in aperture produces 50 kW of power. • Absorbers will intercept most beam energy however • Could be 100 W energy distributed into coils • Challenge for cooling • Possibility of radiation damage to insulation and conductor Field profile well matched to requirements Working Group Meeting

  11. Progress on Several Fronts on PS Design • Simplified Coil Geometry (3 uniform wound solenoid coils using same conductor x section) yet meets field longitudinal gradient requirements • Superconductor cross section specified • Conceptual Design of Mechanical Structure for radial support (hoop stress) • Winding, bussing and splice scenarios considered • Preliminary Radiation studies completed • Insulation and structural damage • Conductor stabilizer degradation from atomic defects • Initial proposal for cooling scheme • Quench protection studies to size aluminum stabilizer PS Coil Profile with iron Yoke Working Group Meeting

  12. Design Concepts for PS Vadim Kashikhin Coil and Insulation Preload shell Outer support tube 0.5mm fiberglass at support tube 23.9 MN 10.4 MN 10.9 MN Magnetic Model 0.25mm fiberglass at each side of Al layer Pure Al layers (RRR>3000) 0.5mm fiberglass around cable Structural Support Model Mechanical Analysis N. Mokhov V. Pronskikh Neutron Flux Density

  13. Detector Solenoid • Large Volume : Aperture (2 m), Length 11 m • Upstream: Axially graded field (2T1T) • Downstream: Uniform 0.1% 1 T field (similar to ATLAS) • Large Amount of Stored energy (35 MJ) • Large asymmetric axial forces (unlike HEP detector solenoids) Atlas Solenoid 2 Tesla 2.5 m Aperture 5 meters long • Design Status • Two concepts for Coil Geometry Considered (which meet specs) • Started mechanical FEA analysis of coils (Wands) • Developing 3-D Solid Model to study interface issues • Cryostat supports will likely be modeled after PS Solid Model DS End View

  14. 5-Segment DS Coil Design Iron yoke shapes the end field + is part of Cosmic Ray Veto Wake/Yamada Conductor Profile Field Profile Working Group Meeting

  15. Transport Solenoid Design from Meco • Meco Design has 60 solenoid rings • Divided into two cryostats • Gap in middle for P-bar and Vacuum Window • There is a collimator for momentum selection in center region that cannot be adjusted • In order to get desired field each coils has a unique amp-turns. Gap greatly complicates coil designs Working Group Meeting

  16. Mu2e Ideas • Build center straight section as one removable piece • Eliminates gap in center of SS • Collimator should be rotatable to allow passage of m+ for calibration (with minimal impact on magnets) • Can Toroid sections be built in simpler units? • Design Status • Very preliminary concept of SS design which meets “negative gradient” spec. • Alignment tolerance study completed (Lopes) • Feasibility study of toroid section fabrication started Working Group Meeting

  17. Coil Design Progress SS Coil Profile Toroid Coil Concept Working Group Meeting

  18. Cryogenic Design • Cryogenic Distribution Boxes Function: • Supply liquid Helium from cryoplant to magnet • Room Temperature to Liquid Helium Power lead transition (power leads) • Other activities: • Magnet cryostat design • Thermal model for magnet cooling • Estimate heat loads and liquid helium req. for operation and RTLHe cooldown Working Group Meeting

  19. Cost Estimate • We are still working on the conceptual design so cost estimation is not yet possible. As system components reach a mature conceptual design, the fabrication WBS levels will be filled in. Estimating schedule and resources / task will depend on the specific activity. • Possible sources for “basis of estimates” • Our own experience with magnet fabrication • Much of the APUL and CERN IR quad experience is relevant • MECO WBS and Cost workbook, where applicable • We may hire consultants for specific processes • RFI may shed some light on fabrication process Working Group Meeting

  20. Long/Short Term Schedule • Preliminary CD/Start RFI July 2010 • Internal Reviews of CD Fall 2010 • CDR Complete Jan 2011 First Pass at Long Term Schedule Relative to CD1 Approval Working Group Meeting

  21. Conclusion • Mu2e is an important “Intensity Frontier” experiment for this decade at Fermilab • Fits well into lab program • Complements LHC program • Substantial progress on solenoid conceptual design • Design team is largely in place • Short term goal is to complete CD by mid FY 2011 • Detailed cost and schedule to follow • Solenoids likely to be on critical path throughout project Working Group Meeting

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