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HIGH RAMP RATE SUPERCONDUCTING MAGNETS AT BNL

HIGH RAMP RATE SUPERCONDUCTING MAGNETS AT BNL. Peter Wanderer BNL Archamps Workshop, March 2003. OUTLINE. New facility at GSI  work with BNL to modify RHIC dipoles  1 st magnet test Magnet construction (except superconductor) - Wanderer Quench performance - Wanderer

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HIGH RAMP RATE SUPERCONDUCTING MAGNETS AT BNL

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  1. HIGH RAMP RATE SUPERCONDUCTING MAGNETS AT BNL Peter Wanderer BNL Archamps Workshop, March 2003

  2. OUTLINE • New facility at GSI  work with BNL to modify RHIC dipoles  1st magnet test • Magnet construction (except superconductor) - Wanderer • Quench performance - Wanderer • Superconductor R&D – Ghosh • Energy loss measurements - Ghosh P. Wanderer

  3. GSI NEW FACILITY • Use existing machines, add new accelerators, storage ring. • Serve several areas of science • General approval by German Government • Construction: Phased approach • Superconducting magnets for the highest energy accelerator (SIS200) • Last phase of construction P. Wanderer

  4. (DIPOLES FOR SIS100) • SIS100 may use superconducting magnets too (not discussed further here) • PROPOSAL (November 2001) • Superferric, 2T central field, 4 T/sec ramp • Start with Nuclotron design • PRESENT • Consider resistive dipoles (see L. Bottura) P. Wanderer

  5. DIPOLES FOR SIS200 • PROPOSAL (November 2001) • 4T central field, 1 T/sec ramp, 5 kW (4.5K) • Modify RHIC design, especially cable • GSI + BNL R&D agreement • PRESENT (SIS300) • Physics: 6T, not 4T  2 layer coil • Looking at UNK magnets P. Wanderer

  6. BNL + GSI collaboration • GSI: G. Moritz, J. Kaugerts • BNL: M. Anerella, A. Ghosh, R. Soika, P. Wanderer • Consultants: M. Wilson, W. Hassenzahl P. Wanderer

  7. Coil wedges: G11, not copper Coil oversize by ~ 25m/turn  reduce pole shim by .88 mm & modify ends Collars: assemble 15cm-long packs with G10 tubes instead of brass tubes Collars: G11 keys (except for 2 cm) Magnet (1m): coil & collars P. Wanderer

  8. Magnet: laminations • GSI procurement • BNL drawing • 0.5 mm thick • Si steel • Coated both sides with B-stage epoxy • Glued into 25.4 cm-long blocks (10 blocks) P. Wanderer

  9. Magnet: yoke, shell, splice • Yoke – axial support from ss rods inside G10 sleeves; SS nuts and G10 washers at the ends • Yoke top-bottom alignment: G10 keys • Shell: weld backing strip loose • Ramp & Splice between top & bottom coils – no change from RHIC/LHC P. Wanderer

  10. P. Wanderer

  11. Quench studies • Quench - standard ramp rate (.05 T/s) • Quench until greatly exceed 4T (6.7kA) • Quench at 1-2 T/sec • 5 kA power supply heavily modified • fast ramping • down ramp is mirror of up ramp • Reach 7.5 kA by ramping fast and minimizing time at Imax P. Wanderer

  12. P. Wanderer

  13. CONCLUSION & PLANS • Conclusion: magnet greatly exceeds design field & ramp rate .. a success • Plans: • Measure field quality  new measuring system … later this year • Test magnet w. unvented cable • Further cable improvements • Test magnet in forced flow (supercritical) P. Wanderer

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