1 / 42

11 T Dipole for DS

11 T Dipole for DS. B . Auchmann , L. Bottura , B . Holzer , L . Oberli , L . Rossi, D. Smekens ( CERN) N, Andreev, G. Apollinari , E. Bartzi , R. Bossert , F . Nobrega , I. Novitski , A. Zlobin ( FNAL). M. Karppinen TE-MSC-ML On behalf of CERN-FNAL collaboration.

nevin
Download Presentation

11 T Dipole for DS

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. 11 T Dipole for DS B. Auchmann, L. Bottura , B. Holzer, L. Oberli, L. Rossi, D. Smekens (CERN) N, Andreev, G. Apollinari, E. Bartzi, R. Bossert, F. Nobrega, I. Novitski, A. Zlobin(FNAL) M. Karppinen TE-MSC-ML On behalf ofCERN-FNAL collaboration

  2. Collimation Phase II Upgrade in DS • 2013: IR3 (Decision in June) • 2017: IR7 & IR2 (IR3?) • 2020: IR1,5 as part of HL-LHC • Base-line is re-location of magnets to create space for 4.5 m long warm collimator • Cryo-collimator is an R&D project M. Karppinen TE-MSC-ML

  3. DS Upgrade Scenarios halo Shift 12 Cryo-magnets, DFB, and connection cryostat in each DS transversely shifted by 4.5 cm halo New ~3..3.5 m shorter Nb3Sn Dipoles (2 per DS) -4.5m shifted in s +4.5 m shifted in s M. Karppinen TE-MSC-ML

  4. Cryo-collimator 3061 1541 Courtesy of D. Ramos M. Karppinen TE-MSC-ML

  5. M. Karppinen TE-MSC-ML

  6. Strong DS-Dipole • Plan A (Cryo-collimator, L ≈ 3 m): • 1 x (11.2 T x 10.6 m) magnet, Lcoldmass ≈ 11 m, (MB -4.2 m) => 8 coldmass + 2 spares = 10 CM by 2017 • 2 x (11.2 T x 5.3 m) magnets, Lcoldmass ≈ 11.5 m, (MB -3.7 m) => 16 coldmass + 4 spares = 20 CM by 2017 • Plan B (Warm collimator, L = 4.5 m): • 4 x (11 T x 5.3 m) dipoles, Lcoldmass ≈ 23.0 m • Approx. 7.3 m for collimator and local orbit / higher order correctors (and ICs, bus-bar lyras etc..) => 32 coldmass + 8 spares = 40 CM by 20?? M. Karppinen TE-MSC-ML

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

  8. Nb3Sn Superconductor • Nb3Sn critical parameters (Jc, Bc2 and Tc) very attractive for accelerator magnets • Requires (long) heat treatment @ 680 °C => Only inorganic insulation materials • Brittle, strain sensitive after reaction • Requires vacuum impregnation with resin => less efficient heat extraction by He • Magneto-thermal instabilities => small filaments, small strands, high RRR • Filaments ~50 µm (NbTi 6 µm) • Persistent current effects • Cost ~5 x NbTi • Limited supply and only few suppliers (compared to NbTi) M. Karppinen TE-MSC-ML

  9. Nb3Sn Accelerator Magnet R&D Progress Both the performance and the technological aspects of the Nb3Sn strands and accelerator magnets have significantly advanced. A. Zlobin, PAC-2011 M. Karppinen TE-MSC-ML

  10. Nb3Sn Magnet R&D at Fermilab • Nb3Sn accelerator magnet R&D at Fermilab since 1999 focusing first on small aperture 10 T dipoles for VLHC • Since 2005 focus on large aperture 200 T/m quads for the LHC upgrade. A. Zlobin, PAC-2011 M. Karppinen TE-MSC-ML

  11. 11 T Model Program M. Karppinen TE-MSC-ML

  12. End-2011 1-in-1 Demo End-2012 2-in-1 #1 FNAL Coils Mid-2013 2-in-1 #2 CERN Coils End-2013 5.5 m Model M. Karppinen TE-MSC-ML

  13. Production Phase 2014-17 • Coil production (CERN & FNAL) • Collaring (CERN & FNAL) • Cold mass assembly (CERN) • Cryostat integration (CERN) • Testing (CERN) • Installation in the tunnel • Material cost for 20 off 5.5 m CM ~25 MCHF 3..4 years M. Karppinen TE-MSC-ML

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

  15. Measured Jc (rectangular cable) Courtesy of E. Barzi, FNAL M. Karppinen TE-MSC-ML

  16. Working point & EM Forces Measured Jc OST 108/127 Ø0.70 mm 10% degr. 80.4% M. Karppinen TE-MSC-ML

  17. Coil Ends & Practice Coil First practice coil wound with SLS end spacers Yoke cut-back determined such that the Bp is in the straight section M. Karppinen TE-MSC-ML 17

  18. 2-in-1 & 1-in-1 Models B0(11.85 kA) = 11.21 T B0(11.85 kA) = 10.86 T M. Karppinen TE-MSC-ML

  19. 1-in-1 Demonstrator Mechanical Structure • The 25-mm thick slightly elliptical stainless steel collar. • The vertically split iron yoke clamped with Al clamps. • The 12-mm stainless steel skin. • Two 50-mm thick end plates. • The coil pre-stress at room temperature is 100 MPa to keep coil under compression up to 12 T. • The mechanical structure is optimized to maintain the coil stress below 160 MPa - safe level for brittle Nb3Sn coils. A. Zlobin, PAC-2011 The structure and assembly tooling design is in progress. M. Karppinen TE-MSC-ML

  20. Design Parameters Note: Cryostat, beam-screen, beam-pipe, (slight) permeability of collars not included M. Karppinen TE-MSC-ML

  21. Courtesy of B. Holzer • AP: Effects to be expected • magnets are shorter than MB Standards  change of geometry • distortion of design orbit by ~7 mm • non-linear transfer function (3.5 TeV)  distortion of closed orbit • ~15..20 mm • R-Bends  S-Bends  edge focusing • feed down effects from sagitta ? • multipole effect on dynamic aperture ? • Analytical approach / Mad-X / Sixtrack Simulations beta beat: tune shift: M. Karppinen TE-MSC-ML

  22. Courtesy of B. Holzer difference in radial coordinate standard LHC – Nb3Sn LHC local result Δx ≈7 mm M. Karppinen TE-MSC-ML

  23. 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 M. Karppinen TE-MSC-ML

  24. Courtesy of B. Holzer The Story of the Transfer Function ... a closed orbit problem effect of nb3sn field error (1.5 Tm) two dipoles distorted orbit, but partially compensated in a closed 180 degree bump ΔΦ = 4.545 ≈ modulo180 degree one Nb3Sn magnet Δx ≈ ± 15 mm M. Karppinen TE-MSC-ML

  25. The Story of the Transfer Function ... a closed orbit problem Courtesy of B. Holzer effect of nb3sn field error (1.5 Tm) two dipoles distorted orbit, and corrected by the “usual methods” x(m) x(m) Δx ≈ -0.5 ... + 1.5 mm  ≈ 5 σ at 3.5 TeV corrected by 20 orbcor dipoles two Nb3Sn magnets M. Karppinen TE-MSC-ML

  26. The Story of the Transfer Function ... a closed orbit problem Courtesy of B. Holzer field error corrected by 3 (20) most eff. correctors zooming the orbit distortion ... local distortion due to Δϕ ≈ 4.545 phase relation, closed by MCBH correctors ! MCBH corrector strength: available: 1.900 Tm needed: 0.805 Tm = 42 % M. Karppinen TE-MSC-ML

  27. 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 M. Karppinen TE-MSC-ML

  28. Nested Trim Circuit 11 T Dipole current needs to be reduced M. Karppinen TE-MSC-ML

  29. Coil Magnetization >10 X MB (NbTi) 11 T Dipole Nb3Sn Mid-Plane Inner Layer Mid-plane Outer layer Inner Layer Pole Outer Layer Pole M. Karppinen TE-MSC-ML

  30. Persistent Current Effects M. Karppinen TE-MSC-ML

  31. Persistent Current Effects M. Karppinen TE-MSC-ML

  32. Additional Correctors? MCS B3 = 0.0518 Tm MCD B5 = 0.000266 Tm M. Karppinen TE-MSC-ML

  33. M. Karppinen TE-MSC-ML

  34. Higher Multipoles Main Dipole 11 T Dipole b9 b9 M. Karppinen TE-MSC-ML

  35. Courtesy of B. Holzer Sagitta: Δr = s l ρ • aperture • feed down effects φ Feed Down Effects: Bdl I b3(syst) b3(pc) Σb3 Bρ 450 GeV 7.7 Tm 758 A 13.96 +95.8 109.8 1.5*103 Tm 3.5 TeV 59.6 Tm 5639 A 13.99 -4.72 9.27 1.2*104 Tm 7 TeV 119.1 Tm 11517 A 13.37 +0.44 13.81 2.3*104 Tm M. Karppinen TE-MSC-ML

  36. Courtesy of B. Holzer Feed Down Effects: Quadrupole Error: Tuneshift: Beta Beat considered as tolerance limit (DA) per Magnet M. Karppinen TE-MSC-ML

  37. 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. M. Karppinen TE-MSC-ML

  38. 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 (red) b3 reduced to 50% (green) b3 reduced to 25% (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 ... which is being studied at the very moment. M. Karppinen TE-MSC-ML

  39. Summary (1/2) • The magnet technology exists and can meet the requirements. Base-line is 5.5 m long CM. • Magnet design is based on engineering choices proven by the HFM programs and LHC magnet production. • The 2 m 1-in-1 demonstrator magnet is well underway and the engineering design of the 2-in-1 demonstrator is in progress. • First optics studies: • Orbit can be corrected by using a significant factor of corrector strength outside of DS. Trim PC would solve the problem. • b3 @450 GeVcan be tolerated up to ˜20 units, which seems achievable (passive shimming, B3 corrector..). M. Karppinen TE-MSC-ML

  40. Summary (2/2) • The integration into the LHC is common effort with with the (cryo-) collimator R&D. • The time scale of the planned upgrade is challenging and requires close collaboration and parallel production lines at CERN and at FNAL. M. Karppinen TE-MSC-ML

  41. Refs [1] A.V. Zlobin, G. Apollinari, N. Andreev, E. Barzi, V.V. Kashikhin, F. Nobrega, I. Novitski, B. Auchmann, M. Karppinen, L. Rossi “Development Of Nb3sn 11 T Single Aperture Demonstrator Dipole For Lhc Upgrades”, presented at PAC-2011, New York, March 2011. [2] G. de Rijk, A. Milanese, E. Todesco, “11 Tesla Nb3Sn dipoles for phase II collimation in the Large Hadron Collider”, sLHC Project Note 0019, 2010. [2] A.V. Zlobin et al., “Development of Nb3Sn accelerator magnet technology at Fermilab”, Proc. of PAC2007, Albuquerque, NM, June 2007. [3] J. Ahlbäck et al., “Electromagnetic and Mechanical Design of a 56 mm Aperture Model Dipole for the LHC“, IEEE Trans. on Magnetics, July 1994, vol 30, No. IV, pp. 1746-1749 [4] G. Ambrosio et al., “Magnetic Design of the Fermilab 11 T Nb3Sn Short Dipole Model”, IEEE Trans. on Applied Supercond., v. 10, No. 1, March 2000, p.322. [5] M.B. Field et al., “Internal tin Nb3Sn conductors for particle accelerator and fusion applications,” Adv. Cryo. Engr., vol. 54, pp. 237–243, 2008. [6] G. Chlachidze et al., “The study of single Nb3Sn quadrupole coils using a magnetic mirror structure,” presented at ASC’2010, Washington, DC, 2010. [7] V.V. Kashikhin and A.V. Zlobin, “Correction of the Persistent Current Effect in Nb3Sn Dipole Magnets”, IEEE Trans. on Applied Supercond., v. 11, No. 1, March 2001, p. 2058. M. Karppinen TE-MSC-ML

  42. Acknowledgements R. Assmann, R. Denz, G. De Rijk, P. Fessia, • Milanese, R. Ostojic, D.Ramos, H. Thiessen, E. Todesco M. Karppinen TE-MSC-ML

More Related