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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. 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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  1. Good Vibrations Vibration studies at CHESS Elizabeth Brost Mentor: Peter Revesz, Don Hartill CLASSE Physics REU June 18, 2009

  2. Outline • Goals • Experimental Setup • Preliminary results • Plans for the rest of the summer

  3. 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

  4. 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)

  5. Piezoelectric Accelerometer Voltage Mass Piezoelectric cantilever G

  6. Collecting Data Amplifier 10V/g ADC Accelerometer Water flow Laptop

  7. Software • Windowing: Blackman • Sample frequency: 2500 Hz • 8192 samples • Range: 0 - 400 Hz • Amplifier gain: 1000 • Performs FFT! (Software deigned by Peter Revesz)

  8. 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)

  9. Preliminary Results concrete floor vs. input coil

  10. Preliminary Results input coil – water on vs. water off

  11. Preliminary Results input coil vs. output coil water out water in

  12. 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

  13. 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!!

  14. Acknowledgements • Peter Revesz, Don Hartill • Sol Gruner • Richard Galik, Georg Hoffstaetter, Ernie Fontes, Lora Hine • NSF • Everyone at CHESS

  15. References C. Mercer, “Acceleration, Velocity and Displacement Spectra Omega Arithmetic,” Prosig Signal Processing Tutorials (2006).

  16. Backup Slides

  17. Windowing (Before) square

  18. Windowing (After) Blackman Bartlett Hanning Hamming

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