vibration related activities at the esrf

Vibration Related Activities at the ESRF

Lin Zhang ESRF

Andrei A Seryi

187

22nd Advanced ICFA Beam Dynamics Workshop on

Ground Motion in Future Accelerators6-9 Novmber 2000, Stanford

Vibration related activities at the ESRF

Lin ZHANGESRF (European Synchrotron Radiation Facility)

BP 220, 38043 Grenoble Cedex, [email protected]

22nd Advanced ICFA Beam Dynamics Workshop on Ground Motion in Future Accelerators6-9 Novmber 2000, Stanford

Vibration related activities at the ESRFL Zhang

Page 2

outline

� Vibration Lab (task, instruments, team)

� Site vibration monitoring (seismic survey)

� Some external vibration sources

� Experimental hall slab

� Vibration correlation study between e-beam, x-ray beamand beamline components

Andrei A Seryi

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Vibration Lab - task

� seismic survey of the site by operating a seismic recording network

� identification of internal and external sources of vibrations

� vibration measurements of accelerator machine (magnets, girder,FE…) and beamline components (optics, diffractometers, tables,vacuum vessels,…)

� technical assistance� damping device development

� advanced vibration studies (modal testing, operating deflectionshape,…)

� acoustic and vibration study (medical chair,…)

� instrumentation



Vibration Lab - instruments

� Data acquisition systems– Lennartz OLM 5800 : seismic survey system with on-line monitoring

– RefTek 72/07-DAT : portable seismic data acquisition station

– HP 35670 : real time spectrum analyser

– SigLab : PC based real time spectrum analyser

� Sensors– CMG-3ESP : 0.033 Hz Guralp 3D seismometers

– Mark Product Geophones : L4C (1Hz), L22 (2Hz), L28B (4.5Hz)

– Accelerometers : Endevco, Kistler,…

� Data processing systems– Matlab, SAC (Seismic Analysis Code, by LLNL), QPL, Star (modal

testing), PITSA, system dedicated software

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Vibration Lab - team

Lin ZHANGMarc Lesourd (technician)

Claude Gomez (technician)

Guy Pedotti, Veronique Caillot (post-doc)

Samir Daoud, Thibault Leduc, Cyrille Vittet (BS degree trainees)

Denis Hatzfeld (Prof.. of UJF, Grenoble)

short-term technicians

many ESRF colleagues (computing, building infrastructures, …)



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Site vibration monitoring - seismic survey system

Lennartz OLM 5800 : seismic survey system with on line monitoringcapacity : 5 channels @ 50Hz or 15 channels @ 25 Hzmode of functioning : event triggering and periodic forcing recordingdynamic range : 120 dBfrequency range : 1-50 Hz

5 sensors (geophone 1Hz)installed around storage ringtunnel

ch3

ch2

ch4

ch5

ch1

motorway A480

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Site vibration monitoring - data monitoring from ctrl room

dpp : peak-to-peak

displacement (µm)

twin=8.192 seconds



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Site vibration monitoring - an earthquake recorded by ESRF

Time : 14-Dec-1994, 9:56:17 - 9:57:30epicenter : Cruzeilles near Geneva,

about 100 kmMagnitude : 4.5/Richter

P-wave S-wave

time delay of S-wave ∆t=15s

→ distance from source ~ 90 km

dpp (µm)

106

65

84

70

70

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Some external vibration sources - speed bump (1991)

during the construction of theESRF storage ring tunnel



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Some external vibration sources - speed bump (1991)

a collaboration work with University of Joseph-Fourier, Grenoble

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Some external vibration sources - sewer covers (1995-1996)

ch3

ch2

ch4

ch5

ch1

motorway A480

peak-to-peak displacement Dpp at the ESRF site

before road repair on the Avenue des Martyrs

0

0.5

1

1.5

2

2.5

3

3.5

4

01/10/96 00:00 08/10/96 00:00 15/10/96 00:00 22/10/96 00:00 29/10/96 00:00

time (dd/mm/year hh:mm)

Dpp

(µ

m)

cell 4cell 10cell 16cell 28



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triggering was made with sensor No.7at its normal position around SRTU

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Page 13




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peak-to-peak displacement Dpp at the ESRF site

before road repair on the Avenue des Martyrs

0

0.5

1

1.5

2

2.5

3

3.5

4

01/10/96 00:00 08/10/96 00:00 15/10/96 00:00 22/10/96 00:00 29/10/96 00:00

time (dd/mm/year hh:mm)

Dpp

(µ

m)

cell 4cell 10cell 16cell 28

peak-to-peak displacements at the ESRF

after road repair of the Avenue des Martyrs

0

0.5

1

1.5

2

2.5

3

3.5

10/12/9600:00

17/12/9600:00

24/12/9600:00

31/12/9600:00

07/01/9700:00

14/01/9700:00

time (dd/mm/yy hh:mm)

Dpp

(µ

m)

cell 4cell 10cell 16cell 21cell 28

end fo roadrepair work

beginning of thewinter shutdown

end of thewinter shutdown

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Experimental hall slab - deformed slab (1991-1992)

shape ofexperimental hall slabsat the ESRF

deformed slab (schematic)due to the differentshrinkage between upperand lower surface



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Experimental hall slab - dpp (1991-1992)

before slab repairby grout injection after slab repair

by grout injectionrepair : grout injection

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Page 17

Vibration correlation study - ID24 / test setup

influences of— e-beam motions— vibrations of optics in the beamline

on the X-ray beam intensity and stability

e-beam

x-ray

BPM

Vertical slits

Poly-chromator

mirrorPhoto-diode

accelerometerI : x-ray intensity by photodiodeBPMV : vertical e-beam positionBMPH : horizontal e-beam positionamir : vibration of the mirror

Test set-up scheme for Vibration correlation betweenx-ray intensity, e-beam and mirror for ID24



Page 18

Vibration correlation study - ID24 / spectra

Spectra of X-ray Intensity, e-beam motion (horizontal), vibration of the mirror

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Vibration correlation study - ID24 : cross spectra

6.8 Hz lateral rocking motion of the magnet-girder assembly10.5 Hz horizontal rotation of the girder34.3 Hz lateral rocking motion of the center quadrupole24.55, 49.1 Hz vacuum pumps for the poly-chromator

Ix-ray^BPMvertical Ix-ray ^ BPMhorizontal



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Vibration correlation study - ID14 X-ray Intensity fluctuation

Influences of— cryostat for

super-conductingwiggle in themachine

— e-beam motion

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Vibration correlation study - ID14



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Vibration correlation study - ID14

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vibration related activities at the esrf

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