TEST MODULE WG Cradles for CLIC module supporting system H. MAINAUD DURAND, N. CHRITIN 04-07-11

SUMMARY Introduction: different types of cradles Requirements Boostec cradles Epucret cradles Conclusion: next steps concerning cradles

Introduction: girders and MB quad support Several 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 plate DB 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).

Introduction: test module and cradles Epucret S M Boostec S M Boostec S M Epucret S M S/M ? M S M C M S M C M M Master side Installed Ordered S Slave side To be designed 4

Introduction: terminology Girder Ves Targets for fiducialisation Cradle Linear actuators Sensors Longitudinal adjustment Mechanical pre-alignment 5

Requirements : main data Adjacent 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 6

Requirements : main data Longitudinal positioning of +/- 0.3 mm will have no impact on the articulation point Each extremity of a girder equipped with a cradle On each cradle: several interfaces, positioned within 0.1 mm, and measured within 5 μm 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 place Area protected : stretched wires Interchangeability between cradles. 7

Requirements : interfaces With sensors: Each cradle hosts the following sensors: 1 cWPS, screwed on a 3 balls interface 1 oWPS, screwed on a 3 balls interface 1 inclinometer, screwed on a 3 balls interface 1 temperature probe, inserted in a hole with a diameter of 4.1 mm Cradles must be rigid and stable in time, with no difference in their shape when equipped or not with sensors (deformations < 2 μm) Slave and Master cradles equipped for test module. Once everything is validated, only master cradles will be equipped. 8

Requirements : interfaces With girders: Reference surfaces for Boostec: one side / one below Reference surfaces for Epucret: one above / one side Boostec Epucret 9

Requirements : interfaces With actuators: Each cradle supported by 2 vertical linear actuators, already ordered, and on radial linear actuator. Range of each linear actuator: +/- 3 mm, resolution < 1 μm With mechanical pre-alignment: Manual adjustment in longitudinal: +/- 0.4 mm, resolution 10 μm With articulation point: Constraints and external forces applied: Vacuum Waveguides 10

Boostec cradles Design of the articulation point 11

Boostec cradles Design of the Boostec cradle: 12

Boostec / Epucret cradles 13

Epucret cradles 14

CONCLUSION First cradles installed are being tested in 169. Results are promising. Tests under progress Qualification of concept of articulation point (Micro-contrôle versus Boostec/CERN: Metrological evaluation Behavior of the articulation point w.r.t micrometric displacements, w.r.t larger displacements (+/- 1 mm) Impact at beam level Impact of displacements on adjacent articulation points Validation of algorithm of repositioning Implementation of active pre-alignment 15

CONCLUSION Rigidity 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. 16

Spare slides

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.

Elongation of 0.053 mm under a load of 400 kg Constraints in “ailettes” under load, with a displacement of 2 mm

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