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WBS 4 Solenoid Magnets Update Mu2e Working Group Meeting 27-Jul-2011 Thomas Page Solenoid Project Engineer

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Outline Internal Design Review in May, 2011 Design status RLS status CDR status 27-Jul-20112Mu2e WG Meeting

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Internal Design Review Internal Design Review held May 3-5, 2011 Organized by Fermilab Directorate Review Committee: Pasquale Fabricatore (INFN Genova) Joel Fuerst (ANL) Alain Herve (UWisc) Jim Kerby (Fermilab) chair Herman ten Kate (CERN) Akira Yamamoto (KEK) 5 Recommendations and several findings 27-Jul-20113Mu2e WG Meeting

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Recommendations 1)Finalization of the conductor design, qualification tests, and subsequent procurement should be the highest priority of the solenoid effort. Response: Collaboration with KEK, CERN (European); RFI for conductor. 2)The physics simulation effort studying operation off the design point must continue at a high priority. Results of these simulations will provide important input to the magnet design margin, the system design to include features to run off the design point, and acceptance test planning. Response: Continued studies in progress. 3)Redesign the magnet systems using a lower and more typical value for the peak voltage of 600V. Response: Peak voltages will be reduced. 4)The 1.5K temperature margin for the solenoids should be documented and closely guarded at this phase of the project. The margin on the production solenoid should be increased. Response: Design iteration with improved margin in progress. 5)A complete R&D plan needs to be developed to answer open questions in a timely manner. Coordination with CERN and KEK efforts may help accelerate the program. Response: In progress. 27-Jul-20114Mu2e WG Meeting

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Conductor development is high priority, esp. for PS (Recommendation 1). Short term plans: RFI to industry to get vendor interest and feedback on conductor. Place an order for a short length (~200-400 m) of each type of conductor (PS & DS). Collaboration with KEK, European collaboration (Recommendation 5) KEK has recently purchased similar cable so we are using this experience as a guide. Cost and lead time will be similar. There is a European collaboration with industry to build new ATLAS cable. We will follow this collaboration and see how Mu2e can fit into this collaboration. Conductor Development 27-Jul-20115Mu2e WG Meeting

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US Japan Agreement Development with Japanese industry of prototype aluminum stabilized NbTi cable suitable for Comet or Mu2e Two cables: 5 kA cable and 10 kA cable (~200 m each) 10 kA cable will be made into a small COMET/Mu2e prototype coil by Japanese industry Fermilab is upgrading its test capabilities to test large aperture, conductively cooled solenoids o Facility would be used to test TS modules. Mu2e WG Meeting627-Jul-2011

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US Japan Agreement Schematic of the prototype coil which will be made in Japanese industry. Mu2e WG Meeting727-Jul-2011

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US Japan Agreement Studies of resistivity degradation as a function of radiation dose. Results of radiation studies at Japanese reactor show Damage to stabilizer is real effect Room temperature anneal is effective in restoring RRR Vitaly Pronskikh analysis supports the idea that we can run for ~1 year before having an anneal o Based on our requirement of RRR degradation