KEK Hiroshi Yamaoka Introduction SKEKB support system for F.F. - - PowerPoint PPT Presentation

Test results of high damping components mounted to the support system for the KEKB final focusing magnets KEK Hiroshi Yamaoka

• Sep. 11, 2012
• H. Yamaoka

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.

Introduction

Applied Loads

• Self-weight(12000kg)
• QC1RE: 1370kg
• QC2RP: 1250kg
• Box: 500kg

KEKB support system for F.F. magnet SKEKB support system for F.F. magnet

Mechanical properties of highly-damping material

500kg QC2RP 1250kg QC1RE 1370kg

F=a・cos(wt)

Spectrum analysis

Spring constant: k

• It is possible to input several damping ratio.
• Define: Harmonic load, Spring constant.

Problem: Only one damping ratio can be input.

First step: Optimization of mounting place

Input GM data to the fixed positions.

Harmonic analysis

Evaluation tests

QCS-top QCS-back QCS-boat KEK-Floor Movable table

• 3. Test-3:Vibration measurement with highy-damping material-2
• 1. Test-1: Vibration measurement at original configuration.
• 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.
• Measure vibration in each position.
• Investigate effect of damping by calculating F.R.F.
• Compare to the calculation.
• 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