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naoki.aritomi - 18:10 Wednesday 06 September 2017 (1483) Print this report
Calibration of QPDA1,2 DC signals to MCi oplev signals

[Aritomi, Nakano, Kokeyama] 

We excited pitch and yaw motion of MCi and compared the power spectrum of MCi oplev signals and QPDA1,2 DC signals and calibrated QPDA1,2 DC signals to MCi oplev signals by changing the DC gain of QPDA1,2.
Attached figures show pitch and yaw transfer function from  MCi excitation to MCi oplev and QPDA1,2 DC after calibration. It looks fine.

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Comments to this report:
keiko.kokeyama - 19:07 Thursday 07 September 2017 (3349) Print this report

This is the calibrated spectra of MC REFL QPDs in MCi_urad. Obviously, the beam spots are moving so much more than the MCi mirror. Putting an additional wind shield to cover MC REFL viewport and periscope might help, but I suppose the beam motion is coming from the PSL.

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