1. LHCb RICH2 Analysis of Super-Structure
Static Analysis
Geometry - Original “Baseline” Geometry (Drawing 62)
Boundary Conditions
Loading : Magnetic Shielding = 2 x 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 Kg

2. 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

3. LHCb RICH2 Super-Structure Static Analysis

4. LHCb RICH2 Super-Structure Modal Analysis Results

5. LHCb RICH2 Super-Structure Modal Analysis Results

6. 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