LHCb RICH2 Analysis of Super-Structure Static Analysis Geometry - Original “Baseline” Geometry (Drawing 62) Boundary Conditions Loading : Magnetic Shielding = 2 x 11271 Kg Mirror Masses = 3 Kg Per Mirror Tracking Planes T10 and T11 = 200 Kg Each Constraints : Fully Constrained at “Feet” Positions Calculate Max Deflection under Gravity Loading Modal Analysis Loading : Only Magnetic Shielding = 2 x 11271 Kg

LHCb RICH2 Analysis of Super-Structure Modal Analysis (Cont’d) Optimise Structure to Increase First Natural Frequency Typical Input Spectrums Show Higher Accelerations at Lower Frequencies Investigate Effect of - Gas Box Plates Beam Section i.e Box / I Section Beam Material i.e S. Steel or Al. Alloy

LHCb RICH2 Super-Structure Static Analysis

LHCb RICH2 Super-Structure Modal Analysis Results

LHCb RICH2 Super-Structure Modal Analysis Results

LHCb RICH2 Analysis of Super-Structure Conclusion Static Analysis Static Deflection “Baseline” Model = 1.4 mm (0.8mm without Loading) Modal Analysis Magnetic Shielding - Mass / Position / Assembly are all key Gas Box Plates have little effect Beam Section is Important - Box Section better than equivalent I section Fundamental Frequency of  6 Hz is achievable Future Work Now need to calculate real displacements Require Measurements to provide an appropriate input spectrum for a spectrum analysis