rasclic quadrupole alignment

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RasClicQuadrupole Alignment12-07-2011 Cern

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Alignment of Quadrupoles

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Zerodur spokes within these tubes

Optical path through these tubes

3m

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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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