1962 First CMM DEA (Italy) Ahmed CHERIF CERN Metrology lab. CLIC TECHNICAL COMMITTEE – EDMS : EDMS :

 Overview of CMMs of the CERN Metrology lab.  Today and future needs  How to deal with a large capacity measurement  Example of DB girders  Metrology of CLIC Modules: open questions  Available long stroke machine on the market  Adapted environment to be set up for large CMM  Proposed solutions  Figures (budget and schedule)  Open discussion Ahmed CHERIF EN/MME-MM

A. CHERIF 22 March Accuracy : ± 3 um Accuracy : ± 3 um (+) Accuracy : ± 0.3 +L/1000 um

Ahmed CHERIF EN/MME-MM4 LHCb ATLAS PS COLLIMATEUR CNGS

 The present means are not in line with present and future CLIC requirements (for large capacity and high precision) Ahmed CHERIF EN/MME-MM

 Measurement not feasible  Measure with other means (less precise)  Measured from two measuring stations with an overlap and merging of the results  Measure with long probes and stylus to broaden measurement volume Ahmed CHERIF EN/MME-MM 1 St measurement2 nd measurementOverlap

21/03/ Support points are outside the machine table. Housing of the machine have been removed for the measurement Both extremities of the girder are outside the measuring volume Courtesy of Dominique PUGNAT EN/MME-MM

mm Sphericity Error (typical) : mm Sphericity Error (typical) : mm With the used configuration : mm. With the used configuration : mm. Huge number of probes : 20 probes were necessary Huge number of probes : 20 probes were necessary Ahmed CHERIF EN/MME-MM

Ahmed CHERIF EN/MME-MM 9 The LAB Test Modules layout Current 2 Test Modules Type 0 installation (B169) Concrete blocks for stretching devices Cradle system DB MB DB MB Courtesy of Anastasiya Solodko /BE-RF

 Final dimension of the CLIC Module  Characteristics to be measured  Required accuracy  Accessibility of the features to be measured Ahmed CHERIF EN/MME-MM New CMM mandatory to be defined as a function of :

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Ahmed CHERIF EN/MME-MM From MPE E [um]= ± L/400 to MPE E = ±7 + 7 L/1000 Accuracy: Measuring range : From 2 m up to 10 m For 2 m : ±7.3 [um] For 4 m : ± 17.5 [um] For 6 m : ± 49 [um] For 10 m : ± 77 [um] Different types of machines available depending on required measuring range and accuracy

 Technical criteria  Overall dimensions of the parts to be measured  Features to be measured  Needed accuracy  Number of components to measure  Measuring time to be minimized?  Weight of the module  Environment to be provided  Complementarity with BE/ABP-SU  Are other CLIC experiments or detector applications interested in such machine? Ahmed CHERIF EN/MME-MM

 Temperature stability  Size of the laboratory (Height = vertical T gradient)  Machine weight  Admissible load on the ground  Civil-engineering?  Handling devices  Vibration stability  … Ahmed CHERIF EN/MME-MM

The accuracy is linked to the measuring volume: Option A: Machine capacity : 2.4 metres Accuracy : 5 to 10 micrometres Minimum surface of the laboratory: 50 to 70 m 2, 3.8 m height, service temperature of 20 °C ± 1 K. Option B: Machine capacity : 4 metres Accuracy : 15 to 20 micrometres Minimum surface of the laboratory : 80 to 100 m 2, 5 m height, service temperature of 20 °C ± 1 K Ahmed CHERIF EN/MME-MM 15

Ahmed CHERIF EN/MME-MM16 Budget Schedule

 Questions and/or Comments are welcome  Decision ? Ahmed CHERIF EN/MME-MM 17

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