1. STATIC AND MODAL BEHAVIOUR OF THE CLIC MAIN BEAM BPM SUPPORT M. Esposito, EN-MME The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD CLIC Test Module meeting 7th March 2012

2. The Model 2 BPM Support (304L) Alignment target Support (316L) Flange Upstream body (316LN) Main Body (316LN) Intermediate body (316LN) Chamber adapter (304L) Mass of BPM Support: ~0.2kg Mass of BPM Assembly: ~0.7kg Mass of Align. Support: ~0.14kg M. Esposito, Test Module Meeting, CERN 7 March 2012

3. Boundary Conditions 3 M. Esposito, Test Module Meeting, CERN 7 March 2012 Support is fixed to the magnet & the chamber adapter is fixed to the vacuum chamber which are considered fixed The BPM assembly is considered free on this side

4. Static Structural Analysis 4 M. Esposito, Test Module Meeting, CERN 7 March 2012 Effect of weight: 0.13 μ m center 0.4 μ m max Vertical stiffness: 55 N/ μ m center 41 N/ μ m min Lateral stiffness: 15.5 N/ μ m center 9.1 N/ μ m min Longitudinal stiffness: 769 N/ μ m center 250 N/ μ m min

5. Modal Analysis 5 M. Esposito, Test Module Meeting, CERN 7 March 2012 1 st mode (yaw) 2 nd mode (pitch) 3 rd mode (yaw with torsion) f 1 =650 Hz f 2 =903 Hz f 3 =1506 Hz

6. Comparison between with and without BPM support 6 M. Esposito, Test Module Meeting, CERN 7 March 2012 WITH SUPPORTWITHOUT SUPPORT centerworstcenterworst STATICEffect of Gravity [ μ m] 0.130.40.71.4 Vertical stiffness [N/ μ m] 55419.17.7 Lateral stiffness [N/ μ m] 15.59.1108.3 Longitudinal stiffness [N/ μ m] 769250909714 f [Hz]shapef [Hz]shape MODALMode 1650yaw529pitch Mode 2903pitch585yaw Mode 31506yaw (torsion)960roll

7. Comparison between BPM fully fixed to chamber & fixed only longitudinally 7 M. Esposito, Test Module Meeting, CERN 7 March 2012 FIXED TO CHAMBERFIXED LONGITUDINALLY centerworstcenterworst STATICEffect of Gravity [ μ m] 0.130.40.67 Vertical stiffness [N/ μ m] 554115.4 Lateral stiffness [N/ μ m] 15.59.11.70.9 Longitudinal stiffness [N/ μ m] 769250769 f [Hz]shapef [Hz]shape MODALMode 1650yaw194lateral Mode 2903pitch660pitch+vertical Mode 31506yaw (torsion)903pitch

8. Conclusions 8 M. Esposito, Test Module Meeting, CERN 7 March 2012 A static structural and a modal analysis of the MB BPM support has been performed and results show that the structure is quite robust against external forces and very stiff The BPM support gives little help in terms of modal behaviour, which is already very good, but it gives a significant contribution in terms of vertical stiffness Great attention has to be given to the rigidity of the beam chamber connected to the BPM because it is responsible in major part of the robustness and stiffness of the whole structure

9. M. Esposito, Test Module Meeting, CERN 7 March 2012 SPARE SLIDES

10. Displacement during installation 10 M. Esposito, Test Module Meeting, CERN 7 March 2012 Support pulls BPM 10 microns horizontally Support pulls BPM 10 microns vertically