SSR Structural Design

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SSR Structural Design
G.Lanfranco TD EF Aug. 2nd 2005

• Final One???

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Outline

• Donut daisy ribs merging structural design may
  be considered final
• One design presented, three B.C.
• First step on He Vessel FEA

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The mesh
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the donut rib
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and the daisy rib(no comment on naming
conventions)
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Niobium properties
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Boundary Conditions

• One extreme risky hypothesis
• Beam pipe fully constrained
• The other extreme (very conservative)
• SSR free _at_ beam pipe transition
• In medio stat virtus (virtue sits in between,
  close to reality?)
• Helium vessel restrains the beam pipe and
  provides a fairly rigid support

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Beam pipe fully constrained
Total Deformation m Max 88 mm
Von Mises stress Pa Max 50 MPa 7.2 ksi
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SSR free _at_ beam pipe transition
Total Deformation m Max 600 mm
Von Mises stress Pa Max 70 MPa
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Helium Vessel Restraint
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Helium Vessel Restraint2atm pressure and DT296K
Total Deformation m Max 140 mm
To be double checked with hand calculations !!!
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Tuning Force for 100mm displacement 2000 N
(450 lbf)
Von Mises stress Pa 12.4 MPa
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Summary

• The new design seems OK
• He Vessel still work in progress (included
  thermal FEA)
• to be continued