1. WORK IN PROGRESS F C C Main Quadrupoles FCC week 2017
Clement Lorin,Maria Durante,Helene Felice,Damien Simon - CEA
Tiina Salmi – TUT
Daniel Schoerling - CERN
Berlin, 28 may 2017

2. EuroCirCol baseline WP2
G (T/m)
Bpeak (T)
Bore (mm)
Length (units x m)
MQ FCC
379.2* 12 50
750 x 6.0*
MQ LHC
223
6.5 56
392 x 3.2
Number of apertures
(-) 2
Inter-aperture spacing
(mm)
250
194
Operating temperature
(K)
1.9
Margin along the loadline
(%) 14
19.7
Yoke OD max
800
452
*: Antoine Chance, WP2 leader, EuroCirCol

3. SC density / cable features
Specifications of EuroCirCol project (16 T Nb3Sn dipole)
Use of the cable of the cosine-theta* magnets
Use of the demonstrator strand Φ = 0.7 mm ; cnc = 2.0
Strand
(mm)
1.1
0.7
Nb of strands
(-) 22 36
Bare cable width
13.2
13.3
bare mid-thickness
1.95
1.26
keystone angle
(°)
0.5
Copper/nonCopper
0.8
2.1
*: V. Marinozzi & M. Sorbi (and all INFN ECC team)

4. *Todesco et al, Semi-analyticl approaches to magnet design, Wamsdo 2013
Rossi L., Todesco E. Electromagnetic design of superconducting quadrupoles, PRSTAB, 2006
30°

5. Dipole Low Field str&cable 401 T/m 473 tons (integrated grd) 86% LL
300 K Thotspot
2 possibilities
-Cond qty reduction same gradient
420 tons & 399 T/m
-Gradient increase same 2D cond qty
412 T/m & 460 tons
30°

6. 4 layers designs
6 layers designs

7. Dipole High Field str&cable 367 T/m 530 tons 75% LL 350 K Thotspot
2 possibilities
-Cond qty reduction same gradient
-Gradient increase same 2D cond qty
412 T/m & 472 tons

9. Design emag Quantity v20ar Unit strand diameter 0.7 mm nb of strands36
N/A
width
13.3
average thickness
1.204 – 1.32
Cu/nonCu
2.1
Inom
12285 A
Bpeak
12.12 T
LL margin (1.9 K)
14.0 %
Inductance diff. (2 ap)
17.9
mH/m
Stored energy (2 ap)
1397
kJ/m
Nb of turns
56 = -
F_/_ & F // (per ½-coil)
3.526* & 1.579
MN/m
Hotspot
300 K
Midplane shim
0.3
I/Ic max
0.61
Conductor area (2 ap)
124.2
cm²
750 x 6.0 x 8.7 weight
(dip ~7000 )
tons
* MN/m per layer

10. Design emag Field quality beam injection nominal beam injection

11. Meca design Single aperture model, so far 32 mm thick shell 500 µm ←
[Clement Lorin – Helene Felice - Damien Simon]
Single aperture model, so far
32 mm thick shell
500 µm ←
Ryoke = 275 mm
Contacts/symmetry:
sliding; 0.2 friction
glued: coils with pole
and the first 2 layers/ the last 2 layers

12. Coil stress v4 Contact at 105% σ von Mises σtheta 68 MPa -78 MPa
After key insertion
420 T/m central gradient
105 % nominal
174 MPa
-182 MPa
-8 MPa
+72 MPa
4.2/1.8 K
156 MPa
-156 MPa
420 T/m

13. Meca design After key insertion 4.2/1.8 K 420 T/m Pole - Titanium
246 MPa
462 MPa
305 MPa
127 MPa
243 MPa
245 MPa
Shell - Aluminum

14. Meca design Iron – Pad After key insertion 4.2/1.8 K 420 T/m
Sigma von Mises
300 MPa
667 MPa
672 MPa
Sigma I - tension
264 MPa
267 MPa

15. Meca design Iron – Pad After key insertion 4.2/1.8 K 420 T/m
Sigma von Mises
223 MPa
428 MPa
460 MPa
Sigma I - tension
77 MPa
73 MPa

16. Protection design [Damien Simon -CEA] Temperature:
Everything quenched after 40 ms (validation+ heater delay): worst case - > 313 K (Tiina’s spreadsheet: 300 K)
Voltage:
less than 1.2 kV (600 V max)
vgnd_max [V]
time [s]
vgnd per blocks

17. Conclusion Encouraging preliminary results:Emag-Mecha-Protection:ok
with 250 mm interbeam quad at 400 T/m (Emag 2-in-1 and mechanics 1-in-1)
Emag, room for improvement:
high cnc -> keystone = 0.8° (only two wedges left?)
cnc is reduced: 2.1 -> 1.8 (optimized design- no grading)
Mechanics, still margin for optimization:
get closer to reality (holes for assembly)
adding bladder steps
go to a 2-in-1 config!