1. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 1 HTS insert preliminary design and solenoid prototypes Mélanie Bruchon, Sandrine Cazaux, Chon Pes,Thibault Lécrevisse, Jean-Marc Gheller, Olivier Louchart, Philippe Daniel-Thomas, Philippe Fazilleau, Jean-Michel Rey

2. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 2 HTS insert design Assembly requirements Fresca 2 should not be disassembled to keep the insert in place. The insert should not transfer load on Fresca 2 while powered. As consequences: a gap of 0.5 mm on the radius has to be kept for inserting the HTS insert in Fresca 2. the outer diameter of the insert has to be limited to 99 mm including its supporting structure !

3. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 3 HTS insert design Field and strain calculations

4. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 4 HTS insert design Field and strain calculations

5. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 5 HTS insert design Field and strain calculations Steel pole piece Max VM stress: 580 MPa Titanium pole piece Max VM stress: 606 MPa Displacement 0.44 mmDisplacement 0.285 mm Initial calculation made with tube of 100 mm inner bore

6. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 6 HTS insert design Field and strain calculations With iron pole piece To reach 6T Je = 238 A/mm² Peak field 6.04 T To reach 6T Je = 254 A/mm² Peak field 6.12 T Without iron piece

7. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 7 HTS insert design Field and strain calculations. ep tube=2 mm. σ max = 1071 Mpa, Binsert = 5.56 T. ep tube = 3 mm. σ max = 824 Mpa, Binsert = 5.39 T. ep tube = 4 mm. σ max = 649 Mpa, Binsert = 5.21 T Evolution of the stress (VM) across the tube in most highly loaded area of the tube for Je = 250 A/mm². Background field 13 T. Outer diameter 99 mm. Stainless steel 316LN : σ e (limite élastique)= 980 MPa @ 4K Stainless steel 304LN : σ e (limite élastique)= 890 MPa @ 4K

8. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 8 HTS insert design Coils 3D geometryCross section of the central part 350 mm 700 mm

9. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 9 HTS insert design Assembly scheme EB Welding

10. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 10 HTS insert design Conductor Main conductor: 2 pairs of SC ribbons face to face, with a copper stabilizer inbetween, or 2 SC ribbons and 3 copper stabilizer ribbons Junctions Mid point and end connections: SC back to back To be designed!

11. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 11 HTS insert design Conductor

12. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 12 HTS insert design Winding pack Tape length, 4 SC tape option coil 1 : 170 m coil 2 : 234 m coil 3 : 480 m Total : 1770 m, or 193 k$ (before negociation!) Insert weight : 42 kg

13. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 13 solenoid prototypes Step 1 - Magnetic background field center Copper thermal link

14. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 14 solenoid prototypes Step 1 - Quench heater 3 double pancakes Conductor will be doubled  ext.= 110 mm  int.= 97.44 mm Copper plates 3 mm thick between DP & insulation 0.5 mm. Height of the coil 39 mm. Copper thermal link H=52.8 mm H bobine + structure = 52.8 mm Quench heaters will be installed over one turn for one doubled conductor and one single conductor (two instrumented pancakes)

15. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 15 solenoid prototypes Step 2 –similar mounting using race track coils enabling opening force measurements. Step 3 – solenoid using 4 12 mm wide tapes, for quench propagation and margin studies

16. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 16 Other R&D efforts Junctions resistance measurement Sample holder Sample geometry 12 34 Copper current feed Ribbon 12mm SP SF12050 wide + electrolitic copper for junction Ribbon 4mm wide

17. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 17 Other R&D efforts Junctions resistance measurement Courant critique (critère 1µV/cm) : 98.8 A Résistance de jonction : 90 nΩ Résistance * surface : 576 nΩ.cm² R lapjoint = 144 nΩ.cm² Using SP SCS 4050 should give approximately the values from the Superpower documentation

18. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 18 Other R&D efforts Junctions resistance measurement Next steps: Make a junction using SP SCS 4050 + Indium + SP SF 12050 to reach the the Superpower values. Use the VAMAS like sample holder to measure the junction resistivity down to 4.2 K. Devellop tooling to make the junctions in the case of a coil. Copper junction Titanium support G10 insulation SC ribbon

19. CEA DSM Irfu - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 19 Thank you for your attention