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Design study of the mechanical structure OF the SIS300 superconducting dipoles

Design study of the mechanical structure OF the SIS300 superconducting dipoles. Stefania Farinon WAMSDO08, May 22 nd 2008. Introduction. SIS300 dipole is pulsed (1.5-4.5 T ) At a high field rate (1 T /s) For 10 7 cycles. Main issue is fatigue. SIS300 dipole mechanical structure.

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Design study of the mechanical structure OF the SIS300 superconducting dipoles

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  1. Design study of the mechanical structure OF the SIS300 superconducting dipoles Stefania FarinonWAMSDO08, May 22nd 2008

  2. Introduction • SIS300 dipoleispulsed (1.5-4.5 T) • At a high field rate (1 T/s) • For 107cycles Main issue is fatigue

  3. SIS300 dipole mechanical structure collar keys (stainless steel) E=220 GPa winding E=7.5 GPa iron yoke 1 mm lamination E=200 GPa C-clamps (Al alloy) E=80 GPa collars (Nitronic 40) 3 mm laminationE=192 GPa pins (stainless steel)E=220 GPa

  4. Collaring

  5. collars assembly assembled through pins 3 mm 30 mm

  6. collaring operation total force: 260 tons/m no applied force

  7. Von Mises stress after collaring (MPa) 239 581 209 508 436 179 363 149 120 291 90 218 Nitronic40 yield strength: YS=680 MPa @ 300 K YS=1430 MPa @ 4 K 145 60 73 30 0 0

  8. cool-down and energization of collared-onlywindings (withoutiron) 579 Fx= 0.68 MN/m 510 cool down peak VM stress=175 MPa energization @ 4.5 T peak VM stress=579 MPa =0.35syield (107cycles) 446 Fy=-0.3 MN/m peak stress 382 318 255 smean=(175+579)/2=377 MPa salt=(579-175)/2=202 MPa 100 mm 191 127 64 0

  9. Iron yoke assembly

  10. iron yoke constraints The goal is a side containment to collars. We should: • avoid making a second collaring operation on the winding

  11. force to close the iron yoke we decided to limit the force needed to close the iron yoke to 2/3 of the force needed to close the collars: 170 tons/m C-clamps are heatedtobeinsertedwithoutanyapplied force

  12. iron yoke constraints The goal is a side containment to collars. We should: • avoid making a second collaring operation on the winding • take into account the effect of the different thermal contractions of stainless steel and iron

  13. effect of differential thermal contractions(airon~1.8·10-3, aNitronic40~2.4·10-3) • we apply a pre-stress to the collaredcoils through the iron yoke: • C-clamps are made of Al-alloy (aAl alloy~4.3·10-3) 80 mm are removed from the midplane they keep closed the iron yoke

  14. iron yoke constraints The goal is a side containment to collars. We should: • avoid making a second collaring operation on the winding • take into account the effect of the different thermal contraction of iron and stainless steel • limit the fringe field increase

  15. fringe field 230 mm increased from 230 to 240 mm

  16. fringe field 50 gauss r ~ 290 mm r = 240 mm

  17. peak Von Mises stress (MPa) 1.5 T 4.5 T

  18. fatigue limit in the range 1.5-4.5 T

  19. Conclusions • The mechanical design requiresnecessarilyboth the collars and theironyoketolimit the stresses • The peakstresses (MPa) are: • The fatiguebehaviourisespeciallycritical in this project. The largest stress variation in thecollaris 116 MPa, wellwithin the limit of theSodebergdiagramfor 10 millionscycles

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