peter.king@LIGO.ORG - posted 05:43, Friday 13 April 2018 - last comment - 06:11, Friday 13 April 2018(41421)
FIrst loop ISS status
Aligned beam onto the PDB photodetector in the ISS PD box. Also realigned the beam onto the quadrant photodiode.
The effect of which can be seen in the attached plot.
Engaged the first loop power stabilisation this morning without much hassle. The calculated diffracted power
percentage is off as the coefficients need to be calculated.
Without doing some loop measurements, the gain slider setting of 18 dB maybe the wrong value.
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Comments related to this report
Old coefficients for calculating the diffracted power percentage are displayed in OriginalCoeffs.png. The new coefficients are
displayed in NewCoeffs.png.
With the reduced diffracted power, I changed the limits of the plot in the ISS MEDM screen from 20 to 5.
Images attached to this comment
