1 / 13

TD Designs for mu2e Solenoid Magnets

TD Designs for mu2e Solenoid Magnets. Michael Lamm for the Mu2e Collaboration and TD/Magnet Systems Dept. . All Experimenters’ Meeting January 25, 2010. What is Mu2e?. Measure the Rare Process: m - + N  e- + N relative to m - + N(A,Z)  n + N(A, X)

bastien
Download Presentation

TD Designs for mu2e Solenoid Magnets

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TD Designs for mu2e Solenoid Magnets Michael Lamm for the Mu2e Collaboration and TD/Magnet Systems Dept. All Experimenters’ Meeting January 25, 2010

  2. What is Mu2e? • 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 • Strategy: • Stopped muons in aluminum atom: high probability of interaction • Significant overlap of muon and nucleus wave functions • Kinematically constrained m- + N  e- + Nproduces mono-energetic electrons • Use lifetime of muon in atom to suppress “prompt backgrounds” • Out of time pions, p-bars, electrons in muon channel are a serious problem • Magnets role in Mu2e • Transport as many in-time, stoppable muons as possible • Prevent out of time other particles from reaching stopping target • Provide a uniform stable field for the final captured electron spectrometer All Experimentors Meeting

  3. Transport Solenoid 8 GeV P • Graded field to collect conv. e- (2T1T) • Uniform field for e-Spectrometer (1T) • Production Solenoid Stopping Target (ST) Central Collimator (CC) Production Target (PT) Magnet System by Function • Sign/momentum Selection • Negative Axial Gradient in S.S. to suppress trapped particles ~0.2 T/m PT CC • Reflect and focus low P p/m’s into muon transport • Strong Axial Gradient Solenoid Field 5T2.5T e- Spectrometer ST • Detector Solenoid All Experimentors 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 • Fermilab responsible for all interfaces and infrastructure • Significant magnet coupling between PS-TS and TS-DS • Tight mechanical interfaces • Cryoplant, power supplies, instrumentation… All Experimentors Meeting

  5. SSC cable Copper Bar MECO vs. Mu2e Magnet Concept All Experimentors Meeting

  6. Vadim Kashikhin PS Design • Long continuous inner coils with several short graded outer “tunable” coils for gradient field and to “match into” transport • Benefits relative to Meco • Reduce coil volume by 50% (Conductor Grading) • Reduce inductance by x5 (Increased operating current) • Reduce nuclear heating >x2 (Aluminum Stabilizer) “Graded Conductor” All Experimentors Meeting

  7. Vadim Kashikhin PS Magnetic Design Meco Two layer Continuous Wind Shorter Version All Experimentors Meeting

  8. Temperature and Current Margins are Acceptable 4.5 K SSL Current Margin 6.17 K SSL Current Margin Temperature margin > 1.5 K Current Margin I/Ic = 65 percent All Experimentors Meeting

  9. RRR = 600 RRR = 1100 Quench Protection: Aluminum Stabilized + High Current Mu2e PS Aluminum is an effective stabilizer Coil Peak Temp (Kelvin) Excitation Current (A) Compare to copper stabilizer: peak temperature ~85Kelvin G. Ambrosio All Experimentors Meeting

  10. DS Design (model after Atlas) R. Yamada 2 Tesla 2.5 m Aperture 5 meters long Atlas Solenoid 2 T 1 T gap 1T 1 T 2 1 Tesla 1.8 m Aperture 2.5 meters long 1 Tesla 1.8 m Aperture 7 meters long All Experimentors Meeting

  11. TS Design • We are interested in building simplest, cost effective, most reliable TS Systems • Questions • Confirm that coils met MECO spec (done) • Confirm that muon transmission is insensitive to coil alignment (done) • How sensitive is spec to coil placement? (done) • Coil options. Building SS and/or Toroid coils as a single graded solenoid (ongoing) • Do we need corrector coils (ongoing) R. Coleman / M. Lopes All Experimentors Meeting

  12. Collaboration with Japan Vl. Kashikhin N. Andreev A. Makarov Magnet Construction ongoing: Test in spring 2010 Conceptual Design Technology Magnet to Study Aluminum Stabilized conductor Hitachi Aluminum Stabilized Conductor All Experimentors Meeting

  13. Conclusion • Significant amount of work done prior to CD0 • Design of PS and a bit on DS • Technology development with Japan • CD0  CD1 • Complete the conceptual design + cost and schedule est…. • PS mechanical supports for coils; thermal model for conduction cooling with expected beam induced heat loads; long vs. short length tradeoff • TS work with experiment to define collimator interfaces, coil technology choice • DS mechanical supports for coils especially end forces All Experimentors Meeting

More Related