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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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