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RasClic Quadrupole Alignment. 12-07-2011 Cern. Alignment of Quadrupoles. 3m. Optical path through these tubes. Zerodur spokes within these tubes. Alignment of Quadrupoles. - PowerPoint PPT Presentation
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R. RosingNikhefAmsterdamMechanical Technology
RasClicQuadrupole Alignment12-07-2011 Cern
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R. RosingNikhefAmsterdamMechanical Technology
Alignment of Quadrupoles
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Zerodur spokes within these tubes
Optical path through these tubes
3m
R. RosingNikhefAmsterdamMechanical Technology
Alignment of QuadrupolesPath of the bundle can not be used
for alignment purposes, as this would reduce the amount of time available for the experiment.
Use of external reference (ground) would introduce additional errors => transfer Quadrupole position to outside of magnets.
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R. RosingNikhefAmsterdamMechanical Technology
Alignment of LHC - Alignment of pipe sections
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Thin, vulnerable spokes. RasClic components at spoke endLarge amount
of spoke bending requires support with aluminum/ carbon fibre tubes
Low CTE spokes
R. RosingNikhefAmsterdamMechanical Technology
Reference RingsZerodur refence rings
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Vertical dofconstraint
All dofconstraint
R. RosingNikhefAmsterdamMechanical Technology
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R. RosingNikhefAmsterdamMechanical Technology
RasClic at end of spokes
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R. RosingNikhefAmsterdamMechanical Technology
Meeting the requirementsTemperature range in Quadrupole
Structure: 15 – 25oC=> Spoke-to-spoke deviation in
expansion << 1um.
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R. RosingNikhefAmsterdamMechanical Technology
Properties Zerodur:
r = 2.53g/cm^3 = 25300 kg/m^3E20
oC=90.3GPa,n=0.243
afe – 3 categories:Class 0: 0+/- 0.02x10-6/KClass 1: 0+/- 0.05x10-6/KClass 2: 0+/- 0.10x10-6/KCompany: SchottRods of 6mm x 6mm square cross-section with
a maximum length of 200mm. Goal: 3m=> Requires gluing of several sections of rod.
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R. RosingNikhefAmsterdamMechanical Technology
Quadrupole Reference Ring
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R. RosingNikhefAmsterdamMechanical Technology
Quadrupole Reference Ring - deformation
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Deformation under its own weight – 1.3um deformation.
Not absolute deformation, but ring-to-ring variation is important.
R. RosingNikhefAmsterdamMechanical Technology
Spoke test structure
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Al tube
Zerodur
spoke
Rubber flexo
R. RosingNikhefAmsterdamMechanical Technology
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R. RosingNikhefAmsterdamMechanical Technology
Press-fit
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Or
Spoke is pressed against flat reference block, which has been orderedRequirement: well-defined force and therefore deformation
Demand:Within 0.1 um reproducable
R. RosingNikhefAmsterdamMechanical Technology
Guiding spoke in tubes
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R. RosingNikhefAmsterdamMechanical Technology
Guiding spoke in tubes - 2
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R. RosingNikhefAmsterdamMechanical Technology
Flexo - Mesh
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R. RosingNikhefAmsterdamMechanical Technology
Flexo
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F
R. RosingNikhefAmsterdamMechanical Technology
Flexo flexible enough – hand calculation
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Say:
∆ 𝐿𝐴𝐿
𝐿𝐴𝐿=𝛼 𝐴𝐿 ∙∆𝑇
𝐹 𝑓𝑙𝑒𝑥=𝑘𝑏𝑓𝑙𝑒𝑥 ∙∆ 𝐿𝐴𝐿
𝐹 𝑘𝑠𝑝𝑜𝑘𝑒=𝐸𝐴𝐿 ∙∆𝑥
𝐹 𝑘𝑓𝑙𝑒𝑥=𝐹 𝑘𝑠𝑝𝑜𝑘𝑒
Fkflex FkflexFkspoke Fkspoke
R. RosingNikhefAmsterdamMechanical Technology
Thermal expansion of AL tube w.r.t Zerodur spoke
CTEZerodur
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