Design of Accelerator Girder System for Vibration Suppression

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Outline S. Sharma Ambient Ground Motion NSRRC/July 21, 2005 An overview of some storage ring girder systems Ambient ground motion Transmissibility and damping Girder design (materials, geometry and alignment) Conclusion Mechanical Engineering Group Accelerator Systems Division
Girder vs. Table A girder is used for several purposes: 1. Provides common platform (strongback) to precisely mount several components. 2. Raises components to nominal beam height (acts as a spacer). 3. Simplifies installation and alignment of the components in the accelerator ring. 4. Expedites realignment (e.g. to compensate for floor settlement). The girder, however, adds another structural element to the system. This adversely impacts beam stability due to amplification of floor motion and thermal deformations. S. Sharma Ambient Ground Motion NSRRC/July 21, 2005 Mechanical Engineering Group Accelerator Systems Division Girder Pedestal APS Storage Ring Table APS Linac Bunch Compressor
Page 1: S. Sharma Ambient Ground Motion NSR
Page 5 and 6: SPring-8 Girder System High first n
Page 7 and 8: NSRRC Girder System First natural f
Page 9 and 10: LCLS Girder System Cam movers are u
Page 11 and 12: Transmissibility n = ω ξ = 2 c k
Page 13 and 14: Damping ξ = fraction of η = loss
Page 15 and 16: Deflection/Force (in/lbf) Girder De
Page 17 and 18: Girder Design - Geometry and Suppor
Page 19: Conclusion Viscoelastic Film S. Sha

Design of Accelerator Girder System for Vibration Suppression

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