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PXL vibration and stability

PXL vibration and stability. 1/7/2014. Measurements of:. Cooling air induced vibration of the PXL sensors as a function of air flow DC position change as a function of air flow Position change between power on, warm sector and power off cold sector.

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PXL vibration and stability

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  1. PXL vibration and stability 1/7/2014

  2. Measurements of: • Cooling air induced vibration of the PXL sensors as a function of air flow • DC position change as a function of air flow • Position change between power on, warm sector and power off cold sector

  3. Radial sector motion measured with capacitive probe inserted through hole in PST North half sectors populated with operating ladders. South half populated with empty sector tubes. System operated with full cooling air

  4. Probe position 1 Probe position 2 Sector 3, ladder position out3 Sector 3, ladder position out2 Probe faces the carbon tube flat just west of the ladders

  5. Typical screen shot at full air flow Probe signal Stdev = 5 m Probe conversion = 1 m/0.04 V FFT, see next page for more detail

  6. Fourier transform of sector vibration 230 Hz Main resonance of the carbon sector tube 40 Hz 70 Hz

  7. Measured sector radial vibration as a function cooling air flow for position 1 More precisely this shows measured vibration as a function of blower RPM since flow has been obtained in this case by scaling linearly with RPM. It has been shown, however, that the flow does indeed scale very closely to the blower RPM. The measured vibration with no air flowing: 35 nm RMS

  8. Radial displacement of the sector at position 1 as a function of vibration amplitude An arbitrary offset has been applied to give a 0 intercept since a displacement value was not recorded at zero flow for this series of measurements. The linear dependence demonstrates that the displacement like the vibration amplitude scales as the flow squared. This is not so surprising since the dynamic pressure scales as air velocity squared. Sector moves toward the center with increased flow. Sector displacement scales as cooling air flow squared.

  9. Radial movement between power on and power off with full flow, i.e. Blower RPM = 5940 3 to 8 m Sector moves in toward the center when heating applied.

  10. Summary Sources: OneNote logbook: work>sector vibration>Vibration test full with MSC Analysis: As>AHFT1>cHFT>m>vibration wind>vibration measured full detector.xmcd

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