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Dipole design review: outlines of talks

Gijs de Rijk, Francois Kircher and Jean-Michel Rifflet

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11Dipole design review

• Date: 20-21 January 2011• Place: CEA

• Reviewers:– Giorgio Ambrosio (FNAL)– Lucio Rossi (CERN)– Shlomo Caspi (LBNL)– Akira Yamamoto & Tatsu Nakamoto (KEK)– Yuki Iwasa (MIT)– Pasquale Fabbricatore (INFN Genova)

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11Draft agenda (day 1)

• Introduction 9h00 I-1) EuCARD-HFM and its context.  (GdR)   15’+5’

• II) Technical part 9h20 II-1) Overview of the dipole  (J-M Rifflet)   15’+10’ 9h45 II-2) Conductor choice, properties and procurement strategy (L. Oberli) 20’+10’10h15 Coffee break 15’10h30 II-3) Conceptual design (A. Milanese)  30’+10’11h10 II-4) Engineering design (P. Manil)  30’+10’11h50 II-5) Quench protection (P. Fazilleau)  15’+10’12h15 Lunch break 1h45’14h00 II-6) SMC as preparatory project (J-C. Perez) 20’+10'14h30 II-7) Fabrication process study (M. Durante)  30’+10’15h10 II-8) Winding and tooling tests and insulation choice (F. Rondeaux)  20’+10’ Coffee break 15’15h55 II-9) Cooling, heat transfer and cool-down issues (S. Pietrowicz )  20’+10’16h25 II-10) Insert interfacing (M. Devaux)  10' + 10’

•III) Scheduling and project management16h55 III-1) Magnet design and construction schedule (GdR)  20' + 10'

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11I-1) EuCARD-HFM and its context.  (GdR)   15’+5’

• EuCARD 11 WPs• NED heritage• HFM: 6 tasks• Task 3 dipole, the need for a Fresca (existant 10 T + HF) cable test

facility, prospecting for future accelerator magnets and HFM technologies

• Task 3 EuCard (only) specification for the dipole• Task 3, budget situation and explication of budget links• Work division between the partners

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II-1) Overview of the dipole  (J-M Rifflet)   15’+5’

• The specification (boundaries)• Size considerations: coil, yoke (scaling laws)• Conductor choice

– NED heritage– 1 mm strand in 40 strand cable choice– Maximize current to minimize L (reference to Luc, Philippe)

• History of the design• Basic block coil (Picture 2D baseline)• Shell bladder and key, basic reasons for this

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II-2) Conductor choice, properties and procurement strategy (L. Oberli) 20’+10’

• 1 mm strand (detailed explanation)– Compromise between 1.25 mm and 0.8 mm– Cable size: 40 strands, reasons

• Available providers, history of strand development• Procurement strategy• Cable design parameters and cabling tests• Prototype strands: first results• Prototype cable: first results ( sample length )• Comparison with models Jc used for the design (plot)

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II-3) Conceptual design (A. Milanese)  30’+10’

• Magnetic design (parameters, plots)– 2D (some optimisation reasons, mid plane etc)– 3D (max field etc)

• Mechanical design• -          Présentation générale de la structure mécanique• -          Design mécanique global 2D • o   dimensioning of components • o   quelques courbes de suivi de certains indicateurs, • Option without tube (20 Febr.)• Life cycle construction and powering• Modèle de calcul mécanique 3D• Global structure

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II-4) Engineering design (P. Manil)  30’+10’

• Géométrie de la bobine : – Bending test – Saut de couche – Etude géométrique – Longueur de câble

• Présentation de la structure– Points critiques : support des têtes, bladders…

• Detailed engineering– Usinabilité / choix des matériaux : tube, tolérances, surfaces

complexes…

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II-5) Quench protection (P. Fazilleau)  15’+10’

• Only a feasibility study not yet design decisions• Quench development, current decay, T max, T av, V max• Circuit parameters : dump resistor• Quench heaters : needed ?, test usage• Quench behaviour at 1 T, 5 T, 10 T and 13 T• Gradients T during quench (for later mechanical modeling)• Parameter space

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II-6) SMC as preparatory project (J-C. Perez) 20’+10'

• Aim of the SMC series• SMC description• SMC program (table with magnets / coils, dates, 7 coils )• SMC1 test results• Lessons learned up to now• SMC3 progress• Future work (SMC4 40st) and aims

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II-7) Fabrication process study (M. Durante)  30' + 10’

Question: which tooling is needed and what are the critical issues ? • Insulating• Winding• Mould mounting• Reaction• Preparation for impregnation

– Island manipulations– Splicing– Instrumentation sheets– Ground insulation

• Moulding• Mounting the structure• Coil pack mounting• Bladder and key operations

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II-8) Winding and tooling tests and insulation choice (F. Rondeaux)  20' + 10’

• First winding feasibility test April 2010• Winding tests foreseen• Reaction mould design and tests• Insulation schemes available• Insulation scheme choice process• Moulding material and tests

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II-9) Cooling, heat transfer and cool-down issues (S. Pietrowicz )  20' + 10’

• Temperature and heat model of the magnet• Steady state heat deposition at 4.2 K• Steady state heat deposition at 1.9 K• Cooldown scenario• Stresses in the magnet during cooldown

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II-10) Insert interfacing (M. Devaux)  10' + 5’

• Insert layout• Insert mounting• Field with insert• Quench of insert• Quench of dipole• Risk scenarios

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III-1) Magnet design and construction schedule (GdR)  20' + 10’

• Task breakdown• Design and construction flowchart with decision points• Design and construction schedule (incl SMC4)• Potential bottlenecks