HL-LHC Magnet components and assemblies

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Presentation transcript:

HL-LHC Magnet components and assemblies E. Todesco, F. Savary, D. Duarte Ramos on behalf of WP3 and WP11 See also the presentation from F. Savary in 2015 https://indico.cern.ch/event/387162 And of E. Todesco and D. Duarte Ramos in 2016 (Lisbon) https://indico.cern.ch/event/557233/ 4st April 2017 – CERN

FOREWORD HL-LHC project Magnets and cryostats (this talk) SC Links and powering (next talk from A. Ballarino) E. Todesco

FOREWORD HL LHC magnets are within WP3 and WP11 Different timeline (as shown by I. Bejar Alonso) WP11: to be installed in 2019-20 WP3: to be installed in 2024-25 Together, they represent ¼ of the HL-LHC budget About one third of magnets comes from in kind contributions or collaborations agreements So this fraction is not steered directly by CERN 7 types of new magnets, all built in industry Except 11 T (CERN with industry personnel), Q1/Q3 (US labs) 7 labs participating (LBNL, BNL, FNAL, KEK, CEA, INFN, CIEMAT) Negotiations with other states ongoing (Canada, Sweden, China) E. Todesco

[M. Karpinnen F. Savary et al.] Nb3Sn MAGNETS Two types of Nb3Sn magnets: 11 T and the triplet Both with wind and react technique Both with peak field of 11.5 T Lengths and quantities 4.2 m (Q1/Q3) – 20 units from US (90 coils) 5.5 m (11 T) – 6 units (30 coils) 7.15 m (Q2a Q2b) – 10 units (50 coils) Apertures 60 mm for 11 T (LHC arc) 150 mm for triplet (IR region) D1 cross-section [M. Karpinnen F. Savary et al.] QXF cross-section [P. Ferracin, G. Ambrosio et al.] E. Todesco

Coil manufacturing is the dominant part (time, budget) Nb3Sn MAGNETS Coil manufacturing is the dominant part (time, budget) Same technology: winding, reaction at 650 C, impregnation, instrumentation Mechanical structure is different 11 T: stainless steel collars, loading with collaring press Triplet: Al shell loaded with bladder and key Production strategy: 11 T: at CERN with manpower from industry Triplet: prototypes at CERN, series in industry with a plan-B option of doing at CERN E. Todesco

Two main magnets: D1 and D2 NB-Ti MAGNETS Two main magnets: D1 and D2 Both with Nb-Ti classical technology Rutherford cable Bore field of 4.5 T to 5.6 T Lengths and quantities 6.2 m (D1) – 6 units from Japan 7.8 m (D2) – 6 units (prototype from INFN) Apertures: 150 mm for D1 - 105 mm for D2 Mechanical structure Iron yoke (D1) Self standing collars (D2) D1 cross-section [T. Nakamoto, M. Sugano et al.] D2 cross-section [P. Fabbricatore, S. Farinon]

CORRECTOR MAGNETS: NESTED Nb-Ti technology, sector coil Rutherford cable Nested correctors: bore field of 2.1 T in each plane Lengths and quantities 1.2 m (short) – 6 units (prototype from CIEMAT) 2.1 m (long) – 12 units Series from CIEMAT being discussed 150 mm aperture Mechanical structure Self standing collars, double collaring MCBXF cross-section [F. Toral, J. Garcia Matos et al.]

CORRECTOR MAGNETS: HIGH ORDER Nb-Ti technology, superferric design High order correctors: peak field of 2-3 T (prototypes and series by INFN) Lengths and quantities About 1 m (quadrupole) – 6 units About 0.5 m (dodecapole) – 6 units About 0.1 m (sextupole, octupole, decapole) – 6*7 units 150 mm aperture High Order correctors cross-section [G. Volpini, M. Statera, et al.]

CORRECTOR MAGNETS: CANTED Nb-Ti technology, canted design High order correctors: peak field of 2-3 T (prototype at CERN) Chinese contribution under discussion 2 m long, 12 units 105 mm aperture MBCRD cross-section [G. Kirby, J. Rysti] Winding tests of the canted model [G. Kirby, J. Rysti, J. Mazet, et al.] E. Todesco

LARGE APERTURE Q4 DEVELOPMENT A large aperture Q4 (90 mm) was in the initial baseline (called MQYY) Series removed in June 2016 to cope with budget reduction Activities going on: Short model development from CEA Construction of two prototypes within QUACO EU initiative MQYY [J. M. Rifflet, M. Segreti, et al.] E. Todesco

COMPONENTS Superconducting strand Nb3Sn: Procured by CERN and US collaboration, two producers Nb-Ti: D1 and D2 reuse LHC cable, nested reuses SLHC cable, superferric and canted use existing strands For 11 T and triplet, CERN (and US) procure all main components For Nb-Ti main magnets and correctors, industry will be probably in charge of component procurement CERN will provide raw material (both magnetic and non magnetic steel) to guarantee magnetic performance and to minimize costs E. Todesco

COMPONENTS Non exhaustive list of components Coil: Magnet: Cold mass: Cable insulation Impregnation resin Winding poles End spacers Wedges Quench heaters Magnet: Collars Yoke laminations Cold mass: End domes SS half shells E. Todesco

CRYOSTATS 77 cryostat units | 70 procured by CERN, incl. prototypes and spares Diameter ~1 m Unit lenghts vary from 2 m up to 15 m Roughly 500 m of new cryostats to be installed in the LHC Carbon steel, stainless steel, aluminium, glass fiber composites… Production from now until 2025 Assembly schedule at CERN

CRYOSTATS Design done at CERN (internal design office with service contractor) Procurement of components in industry, mostly as “build-to-print” supplies according to CERN drawings and detailed specifications Assembly at CERN with on-site support of industrial contractors (ex.: mechanical assembly, welding, quality control)

CONCLUSION We have a challenging project requiring substantial involvement of the industry Effective partnership is crucial for the success Several challenges Some new tecnologies to be applied for the first time in high energy accelerator magnets (Nb3Sn, plus canted magnet) More critical aspects Relatively small series, little time to react Many different magnets Timeline of procurement Many collaborations, interfaces management Exchange of information (see www.cern.ch/hilumi/wp3 www.cern.ch/hilumi/wp11 https://project-hl-lhc-industry.web.cern.ch ) E. Todesco