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A Joint Proposal for US-Japan Cooperation Program

A Joint Proposal for US-Japan Cooperation Program. Proposal to JSPS US-Japan collaboration fund R&D of superconducting magnet technology for high intensity muon beam line KEK ARL, Cryogenics Science Center T. Ogitsu, N. Kimura, T. Nakamoto, K. Sasaki, K. Tanaka, A. Yamamoto,

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A Joint Proposal for US-Japan Cooperation Program

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  1. A Joint Proposal for US-Japan Cooperation Program • Proposal to JSPS US-Japan collaboration fund • R&D of superconducting magnet technology for high intensity muon beam line • KEK • ARL, Cryogenics Science Center • T. Ogitsu, N. Kimura, T. Nakamoto, K. Sasaki, K. Tanaka, A. Yamamoto, • IPNS, Cryogenics Group • Y. Makida, T. Okamura • FNAL • Technical Div. • M. Lamm, A. Zlobin, V. Kashikhin, E. Barzi, S. Feher, J. Tompkins

  2. Term • 2009~2014 • Phase I (mainly 2009~2011) • Near term • Projected for Mu2e and COMET • Phase II (mainly 2011~2014) • Long term • Projected for future high intensity muon beam line • Eventually for Neutrino Factory and Muon Collider

  3. Phase I R&D Mu2e COMET Requirement • High Field • More pion to capture • More (better) conductor • Larger stored energy ~5T for COMET and Mu2e • High Radiation • High Power Beam • Heat Load • Radiation Damage ~10 W for COMET Pion Capture Solenoid R&D for Mu2e and COMET

  4. High yield strength Al stabilized conductorNbTi base for field up to 5 T • Superconductor requires good normal conductor as stabilizer and quench protection • Copper is the standard • Density: 8920 Kg/m3 • Aluminum is also a good normal conductor • Density: 2700 Kg/m3 • More transparent against radiation • Can provide less heat load with the same stabilization property

  5. High Yield Strength Al stabilized Conductor R&D • For High Energy Physics • Higher Field：　> 5 Tesla • Larger Size：　Diameter〜10m • Combination of Various Technology • ATLAS Al Ni Alloy • Ni-0.5 ~ 1 % • CMS-Hybrid Support • A6058 -->> A7020 Y.S.(0.2%) = 400 MPa RRR = ~ 400

  6. An R&D Work using ATLAS-CS Conductor + A6061-T6 • T.S. is > 50 % reinforced with A6061 using Electron Beam, and Laser Beam Welding • LBW may be a potential technology Laser Beam Welding EBW, LBW

  7. Phase I R&D: Prototype Solenoid • Fabricate prototype pion capture solenoid • Test items • Mechanical stability • Heat load stability • Quench protection • including coupling

  8. Phase I R&D Plan

  9. Phase II R&D • Aim for future high intensity muon beam line • Eventually neutrino factory or muon collider • More Muon • Higher Field (20 T and more) • Higher Beam Intensity = Higher Heat Load • Advance conductor • Nb3Sn, Nb3Al, MgB2, YBCO, BSCCO • Aluminum stabilizer or aluminum jacket cable in conduit cable • Study on Design Issues associated with using advanced conductor

  10. Conductor Choice for Higher Field and Higher Stability

  11. A15 (Nb3Al, Nb3Sn) • For now the best candidate for high field application Nb3Sn strand Nb3Al strand Al stabilized Nb3Al Conductor (NIFS)

  12. Nb3Sn Rutherford cable Toward Higher Beam Power • Cable in conduit • Removal of large heat load

  13. MgB2 Commercial products are now being available. Low field performances are good up to 20 K, 2 T High field field performance are under development Monel 400 sheathed Diameter: 1.13mm Composition MgB2 (Vol %) 14.6 Fe (Vol %) 10.8 Cu (Vol %) 13.8 Ni (Vol %) 15.8 Monel 400 (Vol %) 45.0 Cost: 3€/m

  14. High Tc Conductors • 22 T already achieved • Possibility to go beyond

  15. Issue • Needs stabilizer for stability and quench protection • Need large conductor for higher operation current, i.e. less inductance • Aluminum stabilizer? • Aluminum jacket cable in conduit? • Hybrid magnet structure for efficiency

  16. R&D Schedule & Budget

  17. Other staffTransport SolenoidR&D at KEK

  18. J-PARC Muon Beam Line • Field; ~2T • Aparture; ~0.4 m • Limited Access to shielded area • Refrigerator must be outside of shield • Limited Space for the refrigerators • Long distance to cold head to coil front • Conduction Cooling with Higher Temperature

  19. R&D Coil made at KEK in house NbTi Already wound Test just started MgB2 version is also planned Trial Winding of Curved Section with MgB2 conductor • Purchase two kinds of MgB2 conductor from Columbus SC • 1 is the 1.13 mm diameter round wire • Will be wound by a company • 2 is the 1.5 * 2.5 mm square wire • Will be wound by Nakahara and Adachi at KEK • They will be wound this winter and Tested in next spring

  20. R&D on Transport SC R&D on trim dipole coil Solenoid Coil by company will be wound till Mar.

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