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LCLS-II Vibration Study – RSY, Seismometer Measurements

LCLS-II Vibration Study – RSY, Seismometer Measurements. Georg Gassner, April10 th , 2013. QUM. Construction Equipment Run – Sensor Placement. 6. 6. 1. 6. 8. 2. 5. 9. QEM. QT4x. 7. 3. 4. 12. 10. 13. 15. 14. 11. … Jack Hammer … Back Hoe … Concrete Vibrator

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LCLS-II Vibration Study – RSY, Seismometer Measurements

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  1. LCLS-II Vibration Study – RSY, Seismometer Measurements Georg Gassner, April10th, 2013

  2. QUM Construction Equipment Run – Sensor Placement 6 6 1 6 8 2 5 9 QEM QT4x 7 3 4 12 10 13 15 14 11 … Jack Hammer … Back Hoe … Concrete Vibrator … Plate Compactor … Core Drilling … Geophone

  3. Construction Equipment Run – Time Table Slide 3

  4. Seismometer Sensors - L4C • Sercel L4C Sensors • Sensitivity: 629 Volts / m/s • Natural Frequency: ~1Hz • Horizontal sensors on top of: • QT41 QT42 and QT43 • QEM1 and QEM2 • QUM1 and QUM2 • Vertical sensors on top of: • QT41, QT42 and QUM2

  5. Data Acquisition Systems • Sampling rate: 4096Hz • System 1 (2 minute datasets): • National Instruments Model SCC-68 (16 Bits)) • Horizontal sensors • QT41, QEM2, QUM1 and QUM2 • System 2 (continuous): • NI Model 9234 (24 Bit) in NI-cRIO9076 • All other sensors

  6. Background Noise – One Week of Data Slide 6

  7. Integrated Motion – Horizontal Back Hoe Back Hoe Back Hoe Plate Compactor Plate Compactor Back Hoe Slide 7

  8. Integrated Motion – Vertical Back Hoe Back Hoe Back Hoe Back Hoe Plate Compactor Plate Compactor Slide 8

  9. Statistical Distribution Slide 9 • 30 minutes of data split into 10 second intervals • FFT of all 10 second intervals • Sorting of values

  10. Results – PSD Back Hoe

  11. Results – PSD QT41H & QT42H

  12. Results – PSD QEM1H & QEM2H

  13. Results – Position Back Hoe

  14. Summary and Outlook • Back Hoe has biggest influence of the construction equipment tested • Continuous vibration during Back Hoe operation of • +/- 0.2µm if back hoe is nearby (<20m) • At 60m distance from Back Hoe operation • +/- 0.1µm at QUM and QEM magnets • Vibration de-correlates quickly after initial trigger • Outlook: • Observing x-ray beam while artificially vibrating M1H

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