HTS insert preliminary design and solenoid prototypes

Transcription

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 - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 1

2 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! - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 2

3 Field and strain calculations - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 3

4 Field and strain calculations - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 4

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

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

7 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 4K Stainless steel 304LN : σ e (limite élastique)= 890 4K - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 7

8 Coils 350 mm 700 mm Cross section of the central part 3D geometry - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 8

9 Assembly scheme EB Welding - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/2011 9

10 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! - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

11 Current(A) HTS insert design 4000 Conductor Ic(4.2K,B) scs4050 Ic(5.5K,B) scs 4050 Ic(4.2K,B) scs Ic(5.5K,B) scs12050 Measurement CERN SCS4050 Load line point de fonctionnement Parallel Magnetic field (T) - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

12 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 - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

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

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

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 - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

16 Other R&D efforts Junctions resistance measurement 1 2 Ribbon 12mm SP SF12050 wide + electrolitic copper for junction Copper current feed Ribbon 4mm wide 3 4 Sample geometry Sample holder - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

17 Voltage (µv) Other R&D efforts Junctions resistance measurement AMSC 344 C + Indium Current (A) 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 - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

18 Other R&D efforts Next steps: Junctions resistance measurement Make a junction using SP SCS Indium + SP SF 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. G10 insulation Titanium support SC ribbon Copper junction - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/

19 Thank you for your attention - J-M Rey - EUCARD WP 7 Meeting - GRENOBLE 22/03/