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Girder Stabilization at the ESRF Lin ZHANG ( zhang@esrf.fr ) ESRF, BP220, F-38043 Grenoble Cedex. Outline. Introduction Analysis Damping plate Damping links design, installation test results on quadrupoles, with e-beam and x-ray beam Conclusion.

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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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