CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system (EDMS )  General principle  Main inputs an requirements  Suggested solutions for the alignment  Assembling  Conclusion

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system General principle GirdersCradlesArticulation points Standard active motion devices Modules trains (principle, different length...) Improvement of an existing device Cradles(interface) and articulations point (degrees of freedom) are in-between girders Considerations: rigid girders, Vs exists and are well aligned... => Cradle and articulation point are important components (...) Isolated active motion devices Beam axle

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Main inputs and requirements  Beam alignment accuracy (±20µm)  Radial and longitudinal efforts (500N)  Girders  short space, material, manufacturing, tolerances?  Environment  compact assembly (Height, width  Displacement ranges (ΔZ= ΔX= ±3mm, ΔY= ±0.4mm)  Weight (max. 4000N/m)  Assembling modular and simple  Actuators overall volume

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system General principle (zoom on the articulation point principle) Objective: beam axle = beam axle Girder sub-assemblyArticulation sub-assembly Girder sub-assembly No adjustment device in-between 2 girders We need to have less sub-assemblies as possible. Inside sub-assemblies, all red references should be well aligned together!

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system General principle (Girder sub-assembly) Accuracy not easy to obtain but the problem can be skirted around by using shims Machining Accuracy OK Objective: V supports references and holes must be well positioned between them Red references are important Metrological control needed! Beam axle

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system General principle (Articulation sub-assembly) Objective: up and downstream holes must be well aligned. We assemble the 3 parts and we do the final drilling Accuracy is OK (+/-0.01mm) After that the 3 components of an articulation sub-assembly must stay together!

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Suggested solutions for the active alignment  Rectangular trapezium principle 45.5mm 3mm 0.1mm (second-rat motion) Degrees of freedom

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Suggested solutions for the active alignment  Flexible components (blades) are used for kinematic pivot connections where we usually need standard pivots components Example: -Blue square shape fixed -Red square shape connected to the cradle -70N radial force (2x for trapezium) -4000N vertical force  -2.1mm radial displacement -750N/mm2 maximum stress in blades -Vertical movement is less than 0.05mm (compensated by the actuators) Advantages: -High precision -No Friction (no stick-slip/Forces instantaneous transmission) -Good repeatability, suppression of the clearance and the hysteresis phenomenon -Monolithic component

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Suggested solutions for the active alignment  Articulation device: 3 parts assembly Extension area Compression area Stress with total load+1º flexion~650N/mm2 Degrees of freedom Beam axle Total extension with 4000N load =17µm

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Suggested solutions for the active alignment  Fitting cradle-girder Beam Shims

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Suggested solutions for active alignment Radial flexible component Longitudinal flexibles components

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Assembling (Suggested sequence) Male articulation unit Female articulation unit Girder longitudinal sliding Girder vertical moving down Screwed fastening Pre-alignment ±0.2mm

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Assembling(details)

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Assembling (Module removing) Articulation disconnection (2x) Vertical actuators+supports have to be removed (2x) Auxiliary support

CLIC Module meeting, 22/08/2011 N. Chritin (EN/MME) Cradles design for CLIC module supporting system Conclusion (Needs, constaints and suggestion)  20µm expected precision should be reached  Cradles have to be considered as an integral parts of a girder  System compatible with Boostec and Epucert girders  Accurate machining  Specific material using  Meticulous of pre-assembling  Pre-alignment important  Difficulties to reduce the overall dimensions  Gap in-between girder very short  Weight variation is a very high constraint (vertical compensation?)