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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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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
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Reference RingsZerodur refence rings
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Vertical dofconstraint
All dofconstraint
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RasClic at end of spokes
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Meeting the requirementsTemperature range in Quadrupole
Structure: 15 – 25oC=> Spoke-to-spoke deviation in
expansion << 1um.
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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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Quadrupole Reference Ring
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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.
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Spoke test structure
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Al tube
Zerodur
spoke
Rubber flexo
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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
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Guiding spoke in tubes
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Guiding spoke in tubes - 2
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Flexo - Mesh
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Flexo
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F
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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
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Thermal expansion of AL tube w.r.t Zerodur spoke
CTEZerodur
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