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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

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).




Windowing after
Windowing (After)

Blackman

Bartlett

Hanning

Hamming


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