Alignment Work in TT2 and PS During the Shut-down 2006-2007

H. MAINAUD DURAND, N. CHRITIN

TEST MODULE WG

Cradles for CLIC module supporting system

04-07-112SUMMARY

Introduction: different types of cradles

Requirements

Boostec cradles

Epucret cradles

Conclusion: next steps concerning cradles 3

Introduction: girders and MB quad supportSeveral components will be pre-aligned on supports: Along the MB: Along the DB: RF structures on girders PETS + DB quad on girders MB quad on interface plateDB and MB girders will be interlinked with their extremities, based on so-called cradle. This allows a movement in the transverse girder interlink plane within 3 degrees of freedom (articulation point between girders). (Longitudinal direction adjusted thanks to a mechanical guiding). MB quad is mounted on an interface plate, allowing an adjustment along 5 degrees of freedom (longitudinal position will be positioned manually).

4Introduction: test module and cradles

BoostecBoostecEpucretEpucretM CM C?MMMMMMMSSSSSSS/MMSMaster sideSlave sideInstalledOrderedTo be designed

M5Introduction: terminology

Mechanical pre-alignmentVesCradleSensorsTargets for fiducialisationLinear actuatorsGirderLongitudinal adjustment6Requirements : main dataAdjacent girders will be interlinked with their extremities (so called cradle), allowing a movement in the transverse girder interlink plane within 3 degrees of freedom (X, Y, roll)Colinearity of mean axis of Ves on two adjacent girders: 5 um, along X and Y axes in the transverse girder interlink plane

7Requirements : main dataLongitudinal positioning of +/- 0.3 mm will have no impact on the articulation pointEach extremity of a girder equipped with a cradleOn each cradle: several interfaces, positioned within 0.1 mm, and measured within 5 m w.r.t mean axis of Ves.Once one girder is installed, the second shall be installed from the top, with no interferences with supports and stretched wires already in placeArea protected : stretched wiresInterchangeability between cradles.8Requirements : interfacesEach cradle hosts the following sensors:1 cWPS, screwed on a 3 balls interface1 oWPS, screwed on a 3 balls interface1 inclinometer, screwed on a 3 balls interface1 temperature probe, inserted in a hole with a diameter of 4.1 mmCradles must be rigid and stable in time, with no difference in their shape when equipped or not with sensors (deformations < 2 m)Slave and Master cradles equipped for test module. Once everything is validated, only master cradles will be equipped.With sensors:

9Requirements : interfacesReference surfaces for Boostec: one side / one belowReference surfaces for Epucret: one above / one sideWith girders:

BoostecEpucret10Requirements : interfacesEach cradle supported by 2 vertical linear actuators, already ordered, and on radial linear actuator.Range of each linear actuator: +/- 3 mm, resolution < 1 m

With actuators:Manual adjustment in longitudinal: +/- 0.4 mm, resolution 10 m

With mechanical pre-alignment:Constraints and external forces applied:VacuumWaveguides

With articulation point:11Boostec cradlesDesign of the articulation point

12Boostec cradlesDesign of the Boostec cradle:

13Boostec / Epucret cradles

14Epucret cradles

CONCLUSIONFirst cradles installed are being tested in 169. Results are promising.

15Qualification of concept of articulation point (Micro-contrle versus Boostec/CERN:Metrological evaluationBehavior of the articulation point w.r.t micrometric displacements, w.r.t larger displacements (+/- 1 mm)Impact at beam levelImpact of displacements on adjacent articulation pointsValidation of algorithm of repositioningImplementation of active pre-alignmentTests under progressCONCLUSIONRigidity and stress measurements on 3 pieces foreseen this summer, to validate the theoretical study

Epucret cradles received (under CMM measurements), other mechanical parts (mechanical pre-alignment, articulation points) ordered last week, to be delivered end of July 2011.

Technical note will be ready end of July.

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17Spare slides18

For a force applied of 10 N (micrometric screw) at the level of the hole (blue area), we have a displacement of 7.5 mm. At the output, we have a displacement of 0.3 mm.

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Elongation of 0.053 mm under a load of 400 kg

Constraints in ailettes under load, with a displacement of 2 mm

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Pivot under load and inclined (one vertical actuator at 3 mm, the other one at 3 mm)