1 / 17

Cross-section of the 150 mm aperture case

Cross-section of the 150 mm aperture case. Paolo Ferracin. HiLumi WP3 Video-meeting 26 July, 2012. Outline. Design concept Conductor properties Magnet parameters Stress analysis Some additional considerations. From HQ to MQXF Magnetic design concept. HQ. MQXF.

ivria
Download Presentation

Cross-section of the 150 mm aperture case

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. Cross-section of the 150 mm aperture case Paolo Ferracin HiLumi WP3 Video-meeting 26 July, 2012

  2. Outline Paolo Ferracin • Design concept • Conductor properties • Magnet parameters • Stress analysis • Some additional considerations

  3. From HQ to MQXFMagnetic design concept HQ MQXF Paolo Ferracin • Aperture: from 120 mm to 150 mm • Cable width: from 15 mm to 18 mm wide cable • 2 layers with similar angles and 4 blocks • All harmonics below 1 unit at 2/3 of Rinand 80% of Iss • Similar iron geometry, but with OD from 520 mm to 558 mm

  4. From HQ to MQXFMechanical design concept HQ MQXF Paolo Ferracin • Same support structure concept as HQ • Same shell thickness, but OD from 570 mm to 608 mm • Cooling holes and busbar slots added • 10 mm thick LHe vessel included within 630 mm OD

  5. Conductor properties Paolo Ferracin • From 0.80 to 0.85 mm strand • Cu/Sc ratio: 1.13 (53% Cu) • Assumption on Jc • 2500 A/mm2 at 12 T • 1400 A/mm2 at 15 T • Resulting Jc for computations with self field correction • 2650A/mm2 at 12 T • 1450A/mm2 at 15 T • Values consistent with D. Dietderich and H. Felice presentation and with FRESCA2 PIT strand data

  6. Cable and coil parameters HQ MQXF Paolo Ferracin • From HQ to MQXF • Wider cable • Increased insulation • 43% more conductor

  7. Magnet parameters at 1.9 K HQ MQXF Paolo Ferracin

  8. Magnet parameters at 1.9 K * Analytical peak stress on mid-plane ** FEM peak stress (1.9 K / Gnom) Paolo Ferracin • Comparison with expectations • see “Proposal for aperture”, E. Todesco, 02/07/2012

  9. Fringe field MQXF HQ Paolo Ferracin • At 5 mm from the cryostat, fringe field ranging from 3 mTfor HQ to 8 mTfor MQXF

  10. Stress analysis • Lorentz stress on mid-plane • IL: -101 MPa • OL: -121 MPa • Bladder press. / interf. • 17MPa / 0.160 mm • Max shell stress: 150MPa • Lorentz stress on mid-plane • IL: -113 MPa • OL: -122 MPa • Bladder press. / interf. • 27MPa / 0.430 mm • Max shell stress: 230MPa HQ MQXF Paolo Ferracin

  11. Stress analysisCoil peak stress HQ @ 1.9 K -137 MPa MQXF @ 1.9 K -150 MPa HQ @ Gnom -119 MPa MQXF @ Gnom -129 MPa Paolo Ferracin

  12. Some additional considerations on MQXF (I) • Coil optimization • Alternative solution with 53 turns • +2 in outer layer • Sharp wedge and 1 unit of b14 • But…. • 1% of additional margin wrt. Iss • 2% reduction of JO • Reduction of few (4-5) MPa of Lorentz stress on mid-plane (IL) • But smaller effect coil peak stress during operation (work in progress) 51 turns 53 turns Paolo Ferracin

  13. Some additional considerations on MQXF (II) Paolo Ferracin • Cooling holes • 80 mm diameter • Could be increased to 90 mm, depending on axial support system • Busbar • 20 x 50 mm slot • Axial support • 32 mm axial rods • Some space for end-plate and pad-bolts • High stress but probably still fine • Alternative: end-plate welded to vessel

  14. Some additional considerations on MQXF (III) • LHevessel • 10 mm thick cylinder • OD: 630 mm • 1 mm gap between vessel and Al shell (nominal dimension) • About 0.500 mm clearance after pre-loading, cool-down, and excitation • Still to be verified the welding procedure • Other modifications/simplifications • Round collars? • No masters? MQXF Paolo Ferracin

  15. Conclusions Paolo Ferracin • Preliminary analysis of MQXF design based on HQ-concept • 150 mm aperture, wider cable, OD 630 mm • MQXF can generate a gradient of 140 T/m with 20% margin at 1.9 K • 65% higher stored energy than HQ, but similar stored energy density and lower J0 • About 10 MPa higher coil peak stress (from 140 to 150 MPa) • Support structure within stress limits • Further optimization of coil and structure in progress

  16. Appendix Paolo Ferracin

  17. Stress analysisComparison at 80% of Iss Paolo Ferracin • From HQ to MQXF_15mm • IL Lorentz stress: +13% • Peak stress: +15 MPa • From MQXF_15mm to 17mm • Reduction of 10 MPa in peak stress

More Related