LCLS-II Vibration Study – RSY, Seismometer Measurements Georg Gassner, April10 th, 2013.

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Presentation transcript:

LCLS-II Vibration Study – RSY, Seismometer Measurements Georg Gassner, April10 th, 2013

Construction Equipment Run – Sensor Placement Slide QEM QUM QT4x …Jack Hammer …Back Hoe …Concrete Vibrator …Plate Compactor …Core Drilling …Geophone

Construction Equipment Run – Time Table Task #Task Description Start Time Duration [minutes] 1Jack Hammer8:0030 2Back Hoe – scraping asphalt paving8:3015 3Back Hoe – pounding side of hill8:4515 4Concrete Vibrator9:0030 5Plate Compactor9:3030 6Core Drilling – various locations10:0030 7Back Hoe10:3030 8Jack Hammer11:0030 Break11:3090 9Jack Hammer13: Back Hoe – scraping paving13: Plate Compactor14: Concrete Vibrator14: Jack Hammer15: Core Drilling15: Back Hoe16:0030 Slide 3

Seismometer Sensors - L4C Slide 4 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

Data Acquisition Systems Slide 5 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

Background Noise – One Week of Data Slide 6

Integrated Motion – Horizontal Slide 7

Integrated Motion – Vertical Slide 8

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

Results – PSD Back Hoe Slide 10 LocationMain Freq.Side Band QT41 horizontal 31 Hz24 Hz QT42 horizontal 36 Hz26 Hz QT43 horizontal 33 Hz30 Hz QEM1 horizontal29 Hz QEM2 horizontal33 Hz 30 Hz QUM1 horizontal32.5 Hz 38 Hz QUM2 horizontal30.5 Hz 34 Hz

Results – PSD QT41H & QT42H Slide 11

Results – PSD QEM1H & QEM2H Slide 12

Results – Position Back Hoe Slide 13

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