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Corrector Development

Corrector Development. Status of the Corrector R&D in the Frame of the Phase I Upgrade Project M. Karppinen CERN TE-MSC. Acknowledgements. STFC-RAL, UK A. Brummitt , M. Courthold , S. Jones CIEMAT Spain

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Corrector Development

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  1. Corrector Development Status of the Corrector R&D in the Frame of the Phase I Upgrade Project M. Karppinen CERN TE-MSC

  2. Acknowledgements STFC-RAL, UK A. Brummitt, M. Courthold, S. Jones CIEMAT Spain P. Abramian, F. de Aragón, J. Calero, J. de la Gama, L. García-Tabarés, J. L. Gutiérrez, T. Martínez, E. Rodríguez, L. Sánchez, F. Toral, C. Vázquez CERN N. Dalexandro, N. Elias , L. Favre, O. Gumenyuk, A. Kuzmin, M. Karppinen, J. Mazet, L. Oberli, J-C. Perez, D. Smekens, V. Sytnik, G. Trachez, G. Villiger M. Karppinen CERN TE-MSC

  3. Outline IR Corrector layout & parameters for Phase I upgrade Radiation environment Orbit correctors Skew quadrupole Higher order multipoles Summary M. Karppinen CERN TE-MSC

  4. IR Corrector Layout for Phase I Corrector Package (CP) M. Karppinen CERN TE-MSC

  5. Corrector Package (CP) MCXSO MCXO MCXSS MCXS MCXT MQXS MCXBV MCXBH IP ~0.5 m ~0.5 m ~0.5 m ~0.9 m ~1 m ~1 m M. Karppinen CERN TE-MSC

  6. Correctors in Q2 Q3 Q2b Q2a Q1 MCXBH/V (H&V) MCXB V/H (H&V) MQXC MQXC MQXC MQXC 10 m 1..1.3 m 7 m 7 m 1..1.3 m 10 m • Base-line (HV and VH) orbit corrector scheme allows controlling the orbit to a level 3 times larger that then BPM resolution. • To reach the same level as the effective BPM resolution : • Provide 1.5 Tm (1.8 Tm) in H&V-plane in BOTH locations. • Feasibility study was initiated on combined H/V-corrector that meets the reliability requirements • An extra H/V pair means: • Magnet R&D, material R&D, design, component & tooling procurement • Additional powering and protections circuits REF: S. Fartoukh, R. Tomas, J. Miles: “Specification of the Closed Orbit Corrector magnets for the NEW Inner Triplets”, sLHC Project Report 030 M. Karppinen CERN TE-MSC

  7. Expected Radiation Levels CP & Q2 Luminosity: 2 L0 = 2 ×1034 cm-2 s-1 & 1000 fb-1 Peak dose CP:~50..65 MGy ø120 mm, no shield~30..35 MGy ø140 mm, no shield~10 MGy ø140 mm, 10 mm SS Peak dose in Q2 (with 13 mm liner in Q1):~28 MGy, ø120 mm, no shield~ 8 MGy ø140 mm, 10 mm SS Base-line for IR correctors: ø140 mmcoil aperture with 10 mm Stainless steel shielding (i.e. ø120 mm free aperture) Courtesy of F. Cerrutti & A. Mereghetti EN-STI, FLUKA-team M. Karppinen CERN TE-MSC

  8. Requirements.. • Very hostile environment • Material selection (insulation, head spacers, shielding etc..) • Spare policy • “Intervention friendly” design of cryo-magnets • Radioprotection • Reliability: • MCXB must work, no redundancy M. Karppinen CERN TE-MSC

  9. MCXB Initial 2-Layer Design (Bint= 6 Tm) M. Karppinen CERN TE-MSC

  10. MCXB and MQXS(1: Strand & Cable *) extracted strand March -09 275 km SC-strand in stock at CERN Polyimide Insulation: 2 x 25µm + 55 µm (in stock at CERN) 1) 3.5–mm-wide 14-strand cable was developed for the initial MQXS design M. Karppinen CERN TE-MSC

  11. Single Plane MCXBH/V Design Options Two-layer design, 6 Tm / 4 T: • Conceptual magnetic and mechanical design completed. • Sensitive for the HX-hole location and diameter (saturation effects). • Overall length ˜1.8 m. • Based on 18-strand cable successfully produced at CERN. • Over-designed for the updated strength requirements. For 2.5 Tm could run at reduced current and/or shorten to ˜1.5 m • Not enough SC strand stock (275 km) for the total no. of magnets (with 8 MQSX). Single-layer design 1.5..2.5 Tm / 2.3 T: • Engineering design completed. • Less sensitive for the HX-hole dimensioning (as long as in 45 degrees…). • Overall length ˜1.1..1.4 m • Better adapted for stay-clear collars. • Better adapted for the new “spec”. • Existing SC strand stock (275 km) would be sufficient for 45 MCXB coils and 9 MQSX magnets. M. Karppinen CERN TE-MSC

  12. MCXB Single-Layer Design Ø570 Ø140 M. Karppinen CERN TE-MSC

  13. MCXB 3D harmonics (2 x return end) Coil length = 0.9 m Total length = ˜1.1 m b3= 0.74 units b5= 2.86 units b7= -0.41 units b9= -1.65 units b11= -0.55 units ˜260 mm B1= 0.34 Tm x 2 + 2.3T x 0.36 m = 1.5 Tm ENDS STRAIGHT M. Karppinen CERN TE-MSC

  14. MCXB 4-Block Design Quench (3kA) Rd = 0.16 Ω Warm diode No heaters Tmax < 90 K M. Karppinen CERN TE-MSC

  15. MCXB 150 mm Mechanical Model All components for the model magnet in stock M. Karppinen CERN TE-MSC

  16. Combined H/V-Dipole Development Plan Single plane model magnet #1 Single layer coils Porous polyimide insulationStatus: winding trials done Single plane model magnet #2 Same coil design Resin impregnated coils Braided S2-glass insulationStatus: insulated cable characterization started Combined H/V magnet #3 Nested H/V-dipole Potted or porous coils? Status: Mechanical Concept & FEA in started. Today we do not have a design concept for nested MCXB meeting the requirements for IR. M. Karppinen CERN TE-MSC

  17. Nested MCXB Conceptual Design Magnetic optimization of the nested design has been done for a few possible configurations The analysis of possiblemechanical concepts based on nested collaring initiated • Torque:90’000 Nm/m • Shear stress at coil interface ~2.5 MPa. M. Karppinen CERN TE-MSC

  18. MQXS Skew Quadrupole 2-Layer Design *) 14-strand cable M. Karppinen CERN TE-MSC

  19. MQSX Single-Layer Design M. Karppinen CERN TE-MSC

  20. MQSX 3D harmonics (2 x return end) Coil length = 0.78 m Total length = ~0.9 m A2= 2.36 Tm/mx 2 + 28.3 T/m x 0.54 m = 20 Tm/m ENDS STRAIGHT a6= -0.39 units a10= 0.01 units a14= 1.35 units ˜120 mm M. Karppinen CERN TE-MSC

  21. MQSX Single Layer Design Quench (3kA) Rd = 0.16 Ω Warm diode No heaters Tmax < 50 K M. Karppinen CERN TE-MSC

  22. Higher Order Corrector Development • In the framework of the SLHC Collaboration, CIEMAT has developed, constructed and tested two superconducting corrector magnets: the MCXS sextupole and MCXO octupole. • The design is made in view of the very high radiation dose. • Superferricdesign is sufficient to produce the required field strength • The superconducting coils are placed further out and, to some extent, shielded by the iron poles. • The simple race-track coils are easy to make and the field quality is defined by the precision of the iron poles. • P. Abramian, F. de Aragón, J. Calero, J. De la Gama, L. García-Tabarés, J. L. Gutiérrez, T. Martínez, E. Rodríguez, L. Sánchez, F. Toral, C. Vázquez M. Karppinen CERN TE-MSC

  23. Magnetic design: MCXS M. Karppinen CERN TE-MSC

  24. Magnetic design: MCXO/MCXSO M. Karppinen CERN TE-MSC

  25. MCXS Sextupole Engineering Design • Wet impregnated race-track coils • Standard Araldite resin • Laminated ARMCO iron yoke • Alignment by stainless steel keys • Radiation resistance:Coils located further out and partially shielded by the iron poles. M. Karppinen CERN TE-MSC

  26. MCXS Sextupole Fabrication M. Karppinen CERN TE-MSC

  27. MCXO Octupole Engineering Design • Vacuum impregnated race-track coils • Laminated ARMCO iron yoke • Alignment by stainless steelkeys • Radiation resistance: • Polyimide insulated NbTi wire • CTD 422B: a blend of cyanate ester and epoxy resin • Stainless steel coil spacers • Duratron 2300 PEI connection plate and ancillary pieces • Insulating sleeves made of polyurethane and glass fiber M. Karppinen CERN TE-MSC

  28. MCXO Octupolefabrication M. Karppinen CERN TE-MSC

  29. Test results: Sextupole Warm magnetic measurements at CELLS (Barcelona) Cold training test (CIEMAT) • Training test was done in a vertical cryostat at 4.2 K. • The first quench was at 189 A, a working point about 76% on the load line, reaching 89% at quench number 5, where we ran out of helium, without any detraining. M. Karppinen CERN TE-MSC

  30. Test Results: Octupole • Training test was done in a vertical cryostat at 4.2 K. • The first quench was relatively low, at 48% on the load line, although well above the nominal current. • Afterwards, quench current was increasing slowly, with some slight detraining, till currents around 200 A, where coil 8 was repetitively triggering quench. • After thermal cycle the first quench happened at high current, but second quench showed a significant detraining. • Most of the quenches triggered by coil 7, were followed by a quench in coil 8. Afterwards, it was checked that some screws of the common support wedge were loose. Cold training test (CIEMAT) M. Karppinen CERN TE-MSC

  31. Summary • Engineering design of the single plane orbit correctors (MCXB) and skew quarupole (MQXS) have been completed meeting the requirements of the Phase I upgrade. • Components in stock for single-layer MCXB model magnets based on porous and vacuum impregnated coils. • MQXS and MCXB trial coils have been successfully made with polyimide insulation. • 150-mm-long MCXB instrumented mechanical model was successfully assembled. • Nested MCXB conceptual design work was initiated, but halted since 3 years. Today we do not have design of a nested MCXB magnet meeting the requirements of the HiLUMI upgrade. • SuperferricMCXS sextupole and more radiation resistant superferricMCXOoctupole have been succesfully constructed and tested at CIEMAT. • Magnetic design of Cos-6Θ dodecapoleMCXT was made. M. Karppinen CERN TE-MSC

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