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Advanced Girder Stabilization Techniques at ESRF for Enhanced Quadrupole Performance

This presentation by L. Zhang at the SSILS conference (24-26 September 2001) describes innovative methodologies for girder stabilization at the ESRF. It explores the analysis, design, and installation of passive damping systems, including viscoelastic damping plates and links, aimed at reducing vibrations in quadrupole magnets caused by e-beam and x-ray beam interactions. The study details test results from dynamic tests, finite element analysis, and on-line monitoring, demonstrating significant improvements in stability and performance of the storage ring.

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Advanced Girder Stabilization Techniques at ESRF for Enhanced Quadrupole Performance

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  1. Girder Stabilization at the ESRFLin ZHANG (zhang@esrf.fr)ESRF, BP220, F-38043 Grenoble Cedex

  2. Outline • Introduction • Analysis • Damping plate • Damping links • design, installation • test results on quadrupoles, with e-beam and x-ray beam • Conclusion SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  3. Introduction - quadrupole vibration and e-beam motion f1 of MGA (lateral rocking) e-beam motion G10 G20+FE G30 G30+FE 9.0 6.9 8.5 8.2 Hz 7 Hz SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  4. Ix-ray^BPMvertical Ix-ray ^BPMhorizontal 6.8 Hz lateral rocking motion of the magnet-girder assembly 10.5 Hz horizontal rotation of the magnet-girder assembly 34.3 Hz lateral rocking motion of the center quadrupole 24.55, 49.1 Hz vacuum pumps for the poly-chromator Introduction - correlation between e-beam and X-ray beam SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  5. Analysis - damping design Passive or active damping systems Several passive damping systems studied for the ESRF MGAs • ViscoElastic Damping Plates (DP) • Tuned Vibration Absorbers (TVA) • ViscoElastic Damping Links (DL) ViscoElastic Material (VEM) : • very high loss factor (h>0.5) • temperature, frequency dependence • resistance to radiation Installation : • mounting / fixtures • accommodating with environment • low cost SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  6. Analysis - methodology / tools Dynamic tests • modal testing • forcing response function • operating deflection shape Finite Element Analysis • static • modal analysis • harmonic response analysis Dynamic tests Stiffness of jacks damping ratio correlation Finite Element Analysis SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  7. natural frequencies comparison Analysis - natural frequencies &1st mode shape 1st mode from testing 1st mode from FEA SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  8. Analysis - modeling of damping designs using FEA to simulate and optimize different damping designs Finite Element Model (FEM) correlated with test results • transfer function (floor to magnets) : baseline or forcing response function modification of the FEM by introducing different damping designs : • viscoelastic damping plates • tuned damper • viscoelastic damping link SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  9. zoom Damping plate - design and installation • firstly used at APS (Tri-Plate : 3 steel sheets + 2 layers of VEM) • sandwich structure with steel and VEM layers alternately • positioned between the base of the girder jacks and the floor • transfer the strain energy of the MGA to the VEM layers SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  10. cross section (not in scale) 0.5mm thin 2mm thick 0.18mm VEM steel plate steel plate Damping plate - damping performance DTI 6-layer damping pads Specifically designed, anti-creep DTI-6L glued in SRTU, damping factor 12 SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  11. Damping link development Damping plate - position drift of the MGA • DTI 6 layer damping plates installed in cell26 (G10, G20, G30), in 1997 • damping factor of 12 • position drift of the MGA in lateral direction, reaches 0.6 mm at I=200mA • possibly due to • the thermal deformation of the vacuum chamber • the weak shear stiffness of the damping plates. SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  12. GMF : Girder Mounting Fixture VEM : ViscoElastic Material FMF : Floor Mounting Fixture Damping link - design and installation SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  13. Damping link - installation in the ESRF storage ring QF7 QD8 ViscoElastic Material Damping link aluminum plates frame for epoxy resin SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  14. The average Q-value of all the quadrupoles : 43.4 before the installation 7.6 after the installation The reduction factor is : 5.8 Damping link - vibration test results lateral SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  15. motorway A480 ch3 ch2 ch1 ch4 ch5 Damping link - on-line monitoring quadrupole QF7 on G30 in cell 16 (C16QF7) eBPM quadrupole QD4 on G20 in cell 8 (C8QD4) storage ring tunnel in cell 21 (V-C21Fl) storage ring tunnel in cell 28 (V-C28Fl) periodic measurements : 40 seconds every 1/2 (or 1) hour natural event measurements : by triggering SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  16. all storage ring equipped with damping links Damping link - test results with e-beam (rms displacement) half storage ring equipped with damping links SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  17. Damping link - test results with e-beam the ESRF booster is a 10 Hz fast cycling synchrotron the operation of the booster : - during the weekly day of Machine Dedicated Time (MDT) - around re-injection time SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  18. Damping link - test results with e-beam (PSD) PSD : Power Spectrum Density SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  19. Damping link - test results with x-ray beam Spectra of X-ray Intensity measured in ID14-EH1 beamline SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

  20. Conclusion & Acknowledgement • Damping link is effective • to reduce the resonant response of the quadrupoles by a factor of 5.8 • to reduce the peak PSD of the horizontal e-beam motion by a factor of 49 • to improve the stability of e-beam and x-ray beam • Acknowledgement • J.M. Filhol, J.L. Laclare machine directors • L. Farvacque machine physicist • Marc Lesourd measurements • B. Plan, B. Ogier, J. Pasquaud drawings and manufacturing of MFs • Ph. Duru, Jean-Claude Erard installation • E. Plouviez e-beam stability • support Groups SSILS : Girder Stabilization at the ESRF 24-26 September 2001, L Zhang

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