Good vibrations
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Good Vibrations. Vibration studies at CHESS Elizabeth Brost Mentor: Peter Revesz, Don Hartill CLASSE Physics REU June 18, 2009. Outline. Goals Experimental Setup Preliminary results Plans for the rest of the summer. Goals. Study the vibrations in: F-Cave, F3 hutch Capillary puller

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Good Vibrations

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Good vibrations

Good Vibrations

Vibration studies at CHESS

Elizabeth Brost

Mentor: Peter Revesz, Don Hartill

CLASSE Physics REU

June 18, 2009


Outline

Outline

  • Goals

  • Experimental Setup

  • Preliminary results

  • Plans for the rest of the summer


Goals

Goals

  • Study the vibrations in:

    • F-Cave, F3 hutch

    • Capillary puller

    • CESR components

  • Find out what’s causing the vibrations

  • Plan how to stop the vibrations


Experimental setup f cave

Experimental Setup (F-Cave)

me

flow meter

¾” copper coil

accelerometer

coil #1 (in)

water on/off

coil #11 (out)

(Sol Gruner’s design for the experimental setup)


Piezoelectric accelerometer

Piezoelectric Accelerometer

Voltage

Mass

Piezoelectric cantilever

G


Collecting data

Collecting Data

Amplifier

10V/g

ADC

Accelerometer

Water flow

Laptop


Software

Software

  • Windowing: Blackman

  • Sample frequency: 2500 Hz

  • 8192 samples

  • Range: 0 - 400 Hz

  • Amplifier gain: 1000

  • Performs FFT!

(Software deigned by Peter Revesz)


A little bit of digital signal processing

A little bit of Digital Signal Processing

V(t)

FFT

V(f)

105Hz sine wave from a function generator

V(t) V(f) g(f) A(f)

g(f) = C*V(f) (C = 9.9 V/g)

A(f) = - (1/ω2)g(f) (ω = 2πf)


Preliminary results

Preliminary Results

concrete floor vs. input coil


Preliminary results1

Preliminary Results

input coil – water on vs. water off


Preliminary results2

Preliminary Results

input coil vs. output coil

water out

water in


Conclusions

Conclusions

  • Water flow in the cooling coils is a significant source of vibrations, especially at low frequencies

  • Constraining the coils helps to get rid of some

    low-frequency vibrations


Plans for the rest of the summer

Plans for the rest of the summer

  • Continue vibration studies in the F-cave and in other areas of CHESS

  • Identify the source of the vibrations

  • Stop the vibrations!!


Acknowledgements

Acknowledgements

  • Peter Revesz, Don Hartill

  • Sol Gruner

  • Richard Galik, Georg Hoffstaetter, Ernie Fontes, Lora Hine

  • NSF

  • Everyone at CHESS


References

References

C. Mercer, “Acceleration, Velocity and Displacement Spectra

Omega Arithmetic,” Prosig Signal Processing Tutorials (2006).


Backup slides

Backup Slides


Windowing before

Windowing (Before)

square


Windowing after

Windowing (After)

Blackman

Bartlett

Hanning

Hamming


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