Dipole design review: outlines of talks

1. Dipole design review: outlines of talks Gijs de Rijk, Francois Kircher and Jean-Michel Rifflet

2. Dipole design review • Date: 20-21 January 2011 • Place: CEA • Reviewers: • Giorgio Ambrosio (FNAL) • Lucio Rossi (CERN) • ShlomoCaspi (LBNL) • Akira Yamamoto & TatsuNakamoto (KEK) • Yuki Iwasa (MIT) • Pasquale Fabbricatore (INFN Genova)

3. Draft 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 management 16h55 III-1) Magnet design and construction schedule (GdR)  20' + 10'

4. I-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

5. 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

6. 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)

7. 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 • -          Présentationgénérale de la structure mécanique • -          Design mécanique global 2D  • o   dimensioning of components • o   quelquescourbes de suivi de certainsindicateurs, • Option without tube (20 Febr.) • Life cycle construction and powering • Modèle de calculmécanique 3D • Global structure

8. 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…

9. 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

10. 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

11. II-7) Fabrication processstudy (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

12. 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

13. 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 • Cooldownscenario • Stresses in the magnet during cooldown

14. II-10) Insert interfacing (M. Devaux)  10' + 5’ • Insert layout • Insert mounting • Field with insert • Quench of insert • Quench of dipole • Risk scenarios

15. 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