J Munilla F Toral CIEMAT Concept design 2 Two different approaches are being studied Open structure at beam pipe Optimized magnetic design Not horizontal support ID: 1021842
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1. 16 T dipole in common coil configuration: mechanical designJ. Munilla, F. Toral - CIEMAT
2. Concept design2Two different approaches are being studied:Open structure at beam pipe: Optimized magnetic designNot horizontal support available for coil pre-stress at mean planeClosed structure at beam pipeCoils should be moved about 1.5-1.8 mm from beam pipe to accomodate this closed structureStiffer support for higher horizontal pre-stressIt could reduce horizontal displacements of the coilsLess efficiency from magnetic point of view -> More cable neededOption 1 should be preferred here for cable optimizationOption 1 will be shown in following slides12
3. Support structure layout3An outer shell of aluminum holds the coils against horizontal forces.Cable blocks are modeled with smeared-out properties.Lorentz forces are transferred on each cable position.Iron symmetry in horizontal axis is assumedMechanical model and materialsLorentz Horizontal forces map
4. Support structure details4Inner coil is supposed to be impregnated with the inner support (bonded)Aluminum foils (0,5mm) are covering this inner coil (bonded at the same time)Second and third coils are impregnated alone.These parts are impregnated together12Horizontal titanium cover is bolted to the previous support just after the coilsSymmetry planeSymmetry planeSymmetry planeSymmetry planeSingle partSingle part
5. Support structure details5Iron is cut in vertical axis, so it is symmetric only through horizontal axisAluminum shrinkage fitting equivalent to ΔT=10K compression. (60 mm thick)Symmetry planeSymmetry plane(not for iron)Symmetry plane(including iron)
6. Coils stress6Von Mises stress at each step.Some corners arise peak values due to contact effectsAssemblyPeak 13 MpaCool downPeak 96 Mpa16 TMax 123 Mpa
7. Coils displacements from 0T to 16T7Total displacement less than 0,8 mm in horizontal axis, -0,07 mm in vertical (mean plane).Slight shape deformation (not parallel displacement along the coils) Horizontal max/min (0,79-0,53=0,26mm), vertical (0,08-(-0,18)=0,26mm)Coils RELATIVE displacement in mm: horizontal (left) and vertical (right)(displacement between cool down to nominal current)
8. Coils Max Principal stress8Von Mises stress at each step.Some corners arise peak values due to contact effectsAssemblyMax 3 MpaCool downPeak 39 Mpa, “Max” 19MPa16 TPeak 32 MPa“Max” 14 Mpa
9. Stress in iron, 16T9Von-Mises stress Max 550 MPaMax. P. stress 175 MPa
10. Stress in supports10Von-Mises stress map: Max 810 MPa
11. Conclusions11Bonding the inner coil using aluminum frames results in good overall results, but it cannot afford by now all the peak concentrations due to CTE and magnetic forces local changes A closed inner support would help by increasing preload, but the amount of cable will also increase.This open support could have some place for optimization, but local effects in high field areas are quite difficult to deal with… work still ongoing