Sep. 11, 2012 H. Yamaoka Test results of high damping components mounted to the support system for the KEKB final focusing magnets KEK Hiroshi Yamaoka
Introduction SKEKB support system for F.F. magnet KEKB support system for F.F. magnet Applied Loads - Self-weight(12000kg) - QC1RE: 1370kg - QC2RP: 1250kg - Box: 500kg The SuperKEKB project has been progressing in KEK. The target luminosity of the SuperKEKB is 40 times larger. Vertical beam sizes: 50 nm at the interaction point. Vibration has to be kept below the allowable amplitude. High damping material into the system The evaluation test; - The proper locations of mounting damping plates were optimized by FEM. - Evaluation tests have been carried out with the real support system.
Mechanical properties of highly-damping material
First step: Optimization of mounting place Spectrum analysis QC2RP Input GM data to the 1250kg fixed positions. 500kg QC1RE 1370kg Problem: Only one damping ratio can be input. Harmonic analysis F=a ・ cos( w t) Spring constant: k - It is possible to input several damping ratio. - Define: Harmonic load, Spring constant.
Evaluation tests 1. Test-1: Vibration measurement at original configuration. QCS-back QCS-top QCS-boat KEK-Floor Movable table - Measure vibration in each position. - Investigate effect of damping by calculating F.R.F. - Compare to the calculation. 2. Test-2: Vibration measurement with highy-damping material. - Measure vibration in each position. - Investigate effect of damping by calculating F.R.F. - Compare to the calculation. 3. Test-3:Vibration measurement with highy-damping material-2 - Measure vibration in each position. - Investigate effect of damping by calculating F.R.F. - Compare to the calculation. Test results of the vibration measurements will be presented. END
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