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NEWS 3 rd Annual Meeting – June 25, 2018

NEWS 3 rd Annual Meeting – June 25, 2018. NEWS Work Package 7 Advanced Superconducting Technologies for Particle Accelerators Emanuela Barzi, Fermilab. Summary of WP7 Tasks.

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NEWS 3 rd Annual Meeting – June 25, 2018

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  1. NEWS 3rd Annual Meeting – June 25, 2018 NEWS Work Package 7Advanced Superconducting Technologies for Particle AcceleratorsEmanuela Barzi, Fermilab

  2. Summary of WP7 Tasks T6.1: Build and install the superconducting modules of the Mu2e Transport Solenoid (INFN, FNAL). The modules are in construction at the ASG Superconductors in Italy under a FNAL contract, with the active collaboration and supervision of INFN personnel. T6.2: Design and build a 16 T Nb3Sn accelerator dipole (FNAL, INFN). This includes coil design studies, magnetic analysis, design of mechanical structure for the 4-layer coils, and coil stress analysis at the three stages of magnet operation. T6.3: Optimize state-of-the-art electrochemical techniques (US patent pending) for Nb3Sn thin layer deposition on Nb and on Cu (POLIMI, FNAL, Faraday). Applications include performance improvement of superconducting Nb3Sn wires for High Field Magnets, Radio-frequency cavities, superconducting magnetic shields. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  3. WP7 Milestone & Deliverables MS9 : Mu2e Transport Solenoid Constructed [Month No. 20] D7.1 : 16 Tesla Dipole Designed [Month No. 24] Verify the design studies, magnetic analysis, mechanical structure design, coil stress analysis at the three stages of magnet operation (i.e. room temperature, after cooling down at the temperature of operation of 4 K, and at nominal magnetic field operation). D7.2 : Nb3Sn Deposition Technique Optimized on Niobium and Copper [Month No. 36] State of the art electrochemical techniques will be optimized to achieve the best uniformity of the deposit across the surface, the best purity and improve the adhesion of the film. Samples will be experimentally characterized. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  4. Mu2e TS Status (T6.1) (Pasquale Fabbricatore) The TS solenoid, placed between the Production Solenoid and the Detector Solenoid, is composed of 52 superconducting coils integrated into 27 modules constututing the TS serpentine In the years 2013-215 a prototype module was constructed and tested in the framework of a collaboration Fermilab-INFN E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  5. Industrial contract for the module construction (Pasquale Fabbricatore) The contract for the construction of the 27 modules, to be later assembled and integrated into the cryostat at Fermilab, was awarded by Fermilab to ASG Superconductors on Nov. 2015 with a delivery time of about 3 years. Due to the some design refinements in the construction phase the delivery of the last module is now planned for 2019 The coils of TS Module in the delivery box leaving to Fermilab E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  6. Conductor characterization at INFN Genova (Pasquale Fabbricatore) The critical currents of the 4 conductor types involved in Mu2e solenoids (PS, TS and DS) were measured in INFN Genova. More than 40 samples were tested at 4.2K and magnetic field up to 5T. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  7. US Magnet Development Program Cos-theta 15 T Dipole • Coil: • 60-mm aperture • 4-layer graded coil • Wsc = 68 kg/m/aperture • Mechanical structure: • 2-mm StSt coil-yoke spacer • Vertically split iron laminations • Aluminum I-clamps • 12-mm thick StSt skin • thick end plates and StSt rods • Cold mass OD<610 mm • Fabrication status: in progress • Planned magnet test: Spring 2018 Four magnetic cryostats with up to 15T/17 T background field, and with cold apertures between 64 mm and147 mm are connected to new vent and vacuum systems. Five ovens up to 1500◦C for heat treatment in Argon and in Oxygen. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  8. 15 T Dipole: Short Sample and Design Limits * Magnet short sample limit estimated based on extracted strand data: • Issl=12.2 kA (Bap=16.65 T) at 1.9 K • Magnet design limit is determined by mechanical constraints and it is 15 T. • The challenge to solve for the INFN-FNAL collaboration is to push the design limit of these magnets to their superconducting potential (or Short Sample limit). To design and build a 16 T Nb3Sn superconducting dipole, the design limit needs to be at least 17 T. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  9. Results & Status of 16 T Dipole Design (T6.2) E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  10. Sub-Modeling at 300K STATIC LOAD IN ELASTO-PLASTIC REGIME Four magnetic cryostats with up to 15T/17 T background field, and with cold apertures between 64 mm and147 mm are connected to new vent and vacuum systems. 10-STACK SAMPLE Five ovens up to 1500◦C for heat treatment in Argon and in Oxygen. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  11. Next Steps Four magnetic cryostats with up to 15T/17 T background field, and with cold apertures between 64 mm and147 mm are connected to new vent and vacuum systems. Five ovens up to 1500◦C for heat treatment in Argon and in Oxygen. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  12. Results & Status of Nb3Sn Thin Films on Nb (T6.3) Dozens of Nb3Sn film samples were produced on Nb substrate and characterized for SC properties at FNAL. Tc compared with old [1] samples  Electrochemical plating setup at FNAL Ic||(4.2K, B) compared with old [1] samples  SC Properties of best new and old [1] Nb3Sn films E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  13. Results & Status of Nb3Sn Thin Films on Nb (T6.3) SEM of transverse cross section of Sample #23 (left), and EDS of same sample (right). Courtesy of Hitoshi Hayano. DC test at FNAL of Tc0 = 17.6 K of a recent Nb3Sn film sample (left), and M-T curve obtained with SQUID magnetometer, with Tc0 = 17.7 K (right). Courtesy of Akihiro Kikuchi. M-H curve obtained with SQUID magnetometer. The Hc1(4.2 K) = 550 Öe. Courtesy of Akihiro Kikuchi. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

  14. Conclusions MS9 : Mu2e Transport Solenoid Constructed [Month No. 20]: Expected by Nov. 2018, i.e. Month 17, if no delays. D7.1 : 16 Tesla Dipole Designed [Month No. 24] Mechanical design studies are ongoing. PhD student secondments are being planned to accelerate work. D7.2 : Nb3Sn Deposition Technique Optimized on Niobium and Copper [Month No. 36] - Characterization of Nb3Sn film on Nb substrate is ongoing. - Polimi will be leading the technique for Nb3Sn deposition on Cu substrate. Publications • “Nb3Sn Thin Film for the Production of Higher Gradient SRF Cavities at Reduced Costs”, S. A. Kahn, M. A. C. Cummings, Muons, Inc., E. Z. Barzi, S. Falletta, D. Turrioni, Fermilab, A. Kikuchi, NIMS, Tsukuba, Japan, Proceedings of the 9th International Particle Accelerator Conference (IPAC'18), Apr. 29-May 4, 2018, Vancouver, British Columbia, Canada. • “Nano-engineering Nb3Sn Thin Films to Improve Wire Performance and Reduce Cost”, S. A. Kahn, M. A. C. Cummings, Muons, Inc., E. Z. Barzi, Proceedings of the 9th International Particle Accelerator Conference (IPAC'18), Apr. 29-May 4, 2018, Vancouver, British Columbia, Canada. E. Barzi, NEWS 3rd Annual Meeting – June 25, 2018

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