1. Segreti, Lorin, Durante 11 July 2017
ECC block design
Segreti, Lorin, Durante
11 July 2017

2. Emag design – New assumptions
Interbeam distance: 194 mm (as LHC)
High field strand diameter: 1.1 mm (for procurement reason)
Heat treatment dimensional change: +1% width ; +3% thickness
Yoke outer diameter: 570 mm (more room for the Al shell)
Bore thickness: 1.9 mm, including 0.5 mm thick (?) ground insulation
Space for He cooling 2xDN xDN30
-> All of theses items lead to an increase of the qty of conductor

3. v2ari194 Quantity v20ar v1ari204 v2ari194 Unit strand diameter
1.155 – 0.705
1.15 – 0.70
1.1 – 0.7 mm
nb of strands
21 – 35
20 – 34
21 – 34
N/A
BE - Cable width
13.05
12.6
12.47
BE - Cable thickness
2.1 – 1.25
1.94 – 1.23
AF - Cable width x
AF - Cable thickness
2.0 – 1.27
Cu/nonCu
0.8– 2.3
0.8– 2.0
0.8 – 2.0 (1.7)
Inom
10990
10480
10000 A
Bpeak
16.74
16.72
16.76 T
LL margin (1.9 K)
14.01
13.93
13.86 %
Inductance diff. (2 ap)
39.80
44.2
50.2
mH/m
Stored energy (2 ap)
2518
2542
2647
kJ/m
Nb of turns
104 =
108 =
116 = -
Fx & Fy (per ½-coil)
8042 & -3347
8042 & -3329
8269 & -3535
kN/m
Hotspot
349
351
329 (346) K
Bore thickness
1.75
1.6
1.9
Midplane shim
2.25
2.35
LdxI (1 aperture)
218
232
251
HA/m
I/Ic HF-LF
0.47 – 0.61
Out yoke diameter
800
750
570
Conductor area (2 ap)
133.7
130.3
137.9
cm²
4578 x 14.3 x 8.7 weight
7614
7420
7860
tons
v2ari194

4. 2D design

5. Harmonic content

6. Mechanical model ACTUAL MODEL V2ari194 (interbeam distance = 194 mm)
with outer yoke Ø = 570 mm
105 mm thick shell
1.14 mm ←
50 µm ↓
Contacts/symmetry:
sliding; no friction
glued: coils with pole via a Kapton insulation
and all coils together
¼ of the structure
due to symmetries

7. Coil stress distribution
Key
Cold – 4.2 K
16 T σX
-137 MPa
-204 MPa
-196 MPa
von Mises
+147 MPa
+181 MPa
+190 MPa

8. σx at coil / pole interface

9. Synthesis with Ø yoke = 750 mm interbeam distance = 204 mm
90 mm thick shell
850 µm ←
with Ø yoke = 600 mm
interbeam distance = 204 mm
100 mm thick shell
1 mm ←
with Ø yoke = 570 mm
interbeam distance = 194 mm
105 mm thick shell
1.14 mm ←
σX max
σ Von Mises max
Keys
-134
125
Cool-down
-203
187
Energization 16 T
-201
207
σX max
σ Von Mises max
Keys
-132
120
Cool-down
-209
186
Energization 16 T
-202
203
σX max
σ Von Mises max
Keys
-137
147
Cool-down
-204
181
Energization 16 T
-196
190