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11 T Dipole EM Design & Quench Analysis

11 T Dipole EM Design & Quench Analysis. B. Auchmann & M. Karppinen CERN TE-MSC. Magnet Design Constraints. ∫ BdL = 119.2 Tm @ I nom = 11.85 kA 2-in-1 design, intra-beam distance 194 m Cold mass outer contour from MB Heat exchanger location as in MB

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11 T Dipole EM Design & Quench Analysis

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  1. 11 T Dipole EM Design & Quench Analysis B. Auchmann & M. Karppinen CERN TE-MSC

  2. Magnet Design Constraints • ∫BdL = 119.2 Tm @ Inom = 11.85 kA • 2-in-1 design, intra-beam distance 194 m • Cold mass outer contour from MB • Heat exchanger location as in MB • Aperture: Sagitta: 11 m – 5.0 mm, 5.5 m – 1.3 mm => Ø60 mm aperture and straight cold mass • 20 % operation margin on the load-line at 1.9 K • Field harmonics at 10-4 level (TBC by AP) B. Auchmann & M. Karppinen CERN TE-MSC

  3. 11 T Model Program B. Auchmann & M. Karppinen CERN TE-MSC

  4. Cable & Insulation 250 m Nb3Sn cable produced Jc measurements underway First CERN cabling run expected Beg-May B. Auchmann & M. Karppinen CERN TE-MSC

  5. Measured Jc of OST 108/127 RRP strand (40-strand rectangular cable) Courtesy of E. Barzi, FNAL B. Auchmann & M. Karppinen CERN TE-MSC

  6. 2D-Models used for Coil Optimization 6-Block design, 56 Turns, no core 11.21 T B. Auchmann & M. Karppinen CERN TE-MSC

  7. Possible Coil X-Sections 6 Blocks SS Core 55 turns 6 Blocks 56 turns 7 Block SS Core 55 turns 7 Blocks 56 turns 6 Block SS Core 58 turns B. Auchmann & M. Karppinen CERN TE-MSC

  8. Parameters of Coil X-Sections B. Auchmann & M. Karppinen CERN TE-MSC

  9. 2-in-1 & 1-in-1 Models B0(11.85 kA) = 10.86 T B0(11.85 kA) = 11.21 T B. Auchmann & M. Karppinen CERN TE-MSC

  10. Iron Saturation Movie not included in this ppt Movie not included in this ppt Relative permeability Induction (T) Movie not included in this ppt Relative FQ (units) B. Auchmann & M. Karppinen CERN TE-MSC

  11. EM Forces Total Fxaperture = 634 ton/m (MB = 428 ton/m) B. Auchmann & M. Karppinen CERN TE-MSC

  12. Working point & Margins Measured Jc OST 108/127 Ø0.70 mm 10% degr. Bpeak(T) 80.4% Margin(%) Tmarg(K) B. Auchmann & M. Karppinen CERN TE-MSC

  13. End Design Up-right End Minimum Strain End • Based on FNAL experience • Smaller voids to fill on yz-plane • More hard-way strain during winding • 2 winding blocks on the outer layer ends • Based on CERN experience • Larger voids to fill on yz-plane • Minimum hard-way strain during winding • 3 winding blocks on the outer layer ends B. Auchmann & M. Karppinen CERN TE-MSC

  14. Cotronics Ceramic Putty used at CERN B. Auchmann & M. Karppinen CERN TE-MSC

  15. Selective Laser Sintering End Spacers (Stainless steel) B. Auchmann & M. Karppinen CERN TE-MSC

  16. Coil Ends & Practice Coil First practice coil wound with rectangular Cu-cable and stailess steel SLS end spacers First Nb3Sn (114/127) practice coil will be wound as of 9 May. Different end spacer designs will be used in lead and return ends. B. Auchmann & M. Karppinen CERN TE-MSC

  17. 3D Models Yoke cut-back determined such that the Bp is in the straight section 1-in-1 Demonstrator Dipole Yoke covers the ends. => Bp = +0.25 T B. Auchmann & M. Karppinen CERN TE-MSC

  18. Design Parameters Note: Cryostat, beam-screen, beam-pipe, (slight) permeability of collars not included B. Auchmann & M. Karppinen CERN TE-MSC

  19. Transfer Function Correction Below Inom 11 T Dipole is stronger than MB MCBM 1.9 Tm @55 A MCBCM 2.8 Tm @100 A MCBYM 2.6 Tm @ 88 A B. Auchmann & M. Karppinen CERN TE-MSC

  20. New RB Circuit (Type 1) Trim2 C8 C9 C10 C11 C8 0.15H RB.A23 0.1H Trim1 Main Power Converter TRIM Power Converters Total inductance:15.5 H (152x0.1H + 2x0.15H) Total resistance: 1mW Output current: 13 kA Output voltage: 190 V Total inductance: 0.15 H Total resistance: 1mW RB output current: ±0.6 kA RB output voltage: ±10 V • (+) • Low current CL for the trim circuits • Size of Trim power converters • (-) • Protection of the magnets • Floating Trim PCs (>2 kV) • coupled circuits Courtesy of H. Thiessen B. Auchmann & M. Karppinen CERN TE-MSC

  21. Nested Trim Circuit 11 T Dipole current needs to be reduced B. Auchmann & M. Karppinen CERN TE-MSC

  22. Coil Magnetization >10 X MB (NbTi) 11 T Dipole Nb3Sn Mid-Plane Inner Layer Mid-plane Outer layer Inner Layer Pole Outer Layer Pole B. Auchmann & M. Karppinen CERN TE-MSC

  23. Persistent Current Effects Movie not included in this ppt B. Auchmann & M. Karppinen CERN TE-MSC

  24. Persistent Current Effects B. Auchmann & M. Karppinen CERN TE-MSC

  25. Persistent Current Effects B. Auchmann & M. Karppinen CERN TE-MSC

  26. B. Auchmann & M. Karppinen CERN TE-MSC

  27. Courtesy of B. Holzer Field Quality: Dynamic Aperture Studies Collision optics, 7 TeV dyn aperture luminosity optics, 7 TeV, minimum of 60 seeds dynamic aperture for ... ideal Nb3Sn dipoles (red) full error table (green) and for completeness: limits in DA for the phase 1 upgrade study (blue) for the experts: the plot shows the minimum DA for the 60 error distribution seeds used in the tracking calculations. B. Auchmann & M. Karppinen CERN TE-MSC

  28. Courtesy of B. Holzer Field Quality: Dynamic Aperture Studies Injection optics, 450 GeV, no spool piece correctors dyn aperture injection optics, minimum of 60 seeds dynamic aperture for Nb3Sn case: full error table, b3 = 98 units (red) b3 reduced to 50 units (green) b3 reduced to 25 units (violett) b3 = 0 and to compare with: present LHC injection for the experts: unlike to the collision case: at injection the b3 of the Nb3Sn dipoles is the driving force to the limit in dynamic aperture. A scan in b3 values has been performed and shows that values up to b3 ≈ 20 units are ok. Alternative solution: strong local spool piece corrector B. Auchmann & M. Karppinen CERN TE-MSC

  29. Quench Heaters B. Auchmann & M. Karppinen CERN TE-MSC

  30. Protection Studies 1/2 • Protection studies in progress in both labs: • The 1-in-1 Demonstrator can be protected with energy extraction system and heaters • The heater design and powering electronics are subject of R&D. • The Demonstrator test is a good opportunity for extensive protection studies: • Extraction and heater delays • Heater efficiency and required coverage • Quench propagation • Quench-back B. Auchmann & M. Karppinen CERN TE-MSC

  31. Protection Studies 2/2 Protection-heater experiments willprovethe efficiency of the protection system. Simulation shows heater delays between2 and 20 ms. Impact of instabilities and cable eddy-currents? (cored vs. non-cored cable) Movie not included in this ppt Enthalpy margin to quench (mJ/cm3) Movie not included in this ppt B. Auchmann & M. Karppinen CERN TE-MSC

  32. Summary • The magnetic design of the 11 T Dipole magnet is based on magnet technology proven by the HFM programs and LHC magnet production. • Magnet design parameters meet the requirements of the LHC Collimation phase II upgrade. • The engineering design of the 2-in-1 demonstrator is in progress. It will be the first accelerator quality 2-in-1 Nb3Sn magnet. • First optics studies: • Orbit error due to the TF of the 11 T Dipolecan be corrected by using a significant factor of corrector strength outside of DS. Trim PC would solve the problem. • b3 @450 GeV can be tolerated up to ˜20 units, which seems achievable (passive shimming, B3 corrector..). • 1-in-1 Demonstrator magnet will demonstrate the quench performance and operation margin up to the design field of 12 T and give valuable experimental data on the magnetization effects: • Measured magnetization effects will serve to validate the numerical models. • The 1-in-1 Demonstrator dipole can be protected with an external dump resistor. • The 1-in-1 Demonstrator will serve to validate the protection system based on heaters for the accelerator application. B. Auchmann & M. Karppinen CERN TE-MSC

  33. R&D Topics • End part design • Magnetization effects control • Fast power abort tests (quench-back) • Quench protection: • Quench analysis tools • Heater system design • Heater studies B. Auchmann & M. Karppinen CERN TE-MSC

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