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

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

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

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

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

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

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