1. Mechanical results on the double aperture Version V20ar
Michel Segreti, Clément Lorin, Maria Durante, Hélène Felice
28 March 2017

2. Mechanical model 80 mm thick shell 800 µm ← 50 µm ↓ Contacts/symmetry:
sliding; no friction
glued: coils with pole vertically
and all coils together
¼ of the structure
due to symmetries
Version V20ar
from Clément LORIN

3. Coil stress distribution
Key
Cold – 4.2 K
16.8 T (105% nominal) σX
-97 MPa
-229 MPa
-209 MPa
von Mises
+91 MPa
+216 MPa
+207MPa

4. σx at coils / pole interface
σX (Mpa)
16.8 T (105% nominal)
3rd coil
Compression at the coils / pole interface at 8 T and 16 T.
Low traction in the 3rd coil / pole interface in average at 16.8 T, but in compression in the mid-height of the 3rd coil

5. Aperture displacement (µm)
Aperture displacement in the X direction from the nominal position (+125 mm) at each loading step ( the impact on the optic aspect need to be verified ?)
Key A B C
A: -111; B: -110; C: -111
Cold – 4.2 K
A: -606; B: -603; C: -604 A B C
8 T (50% nominal) A B C
A: -579; B: -576; C: -577
16 T (nominal) A B C
A: -502; B: -500; C: -501
16.8 T (105% nominal) A B C
A: -492; B: -490; C: -491

6. Synthesis
For instance, the aperture displacement is about 100 µm between cool-down and energization at nominal current (16 T)

7. Stress in the structure
Von Mises stress distribution in the structure at each loading step
Key
4.2 K
+346 MPa
+965 MPa
8 T
16 T
16.8 T
+821 MPa
+959 MPa
+987 MPa