Here are the results of the arm loss measurements, which I have done before the vent.
I ran the existing matlab script, called 'armLoss.m', to estimate the loss. The script resides in /scripts/LSC.
(Y arm)
Round trip loss = 154.668624 +/- 11.343204 ppm

The figure above is a time series of the measurement.
In the lower plot the power in the ASDC_PD are plotted. The green dotted-curve is the power when the Y arm is unlocked.
The blue dotted-curve is the one when the Y arm is locked.
In the upper plot the estimated loss from each combination of locked/unlocked power are plotted.
(X arm)
Round trip loss = ????? 50 ppm ?????
The obtained time series looked wired because difference in the ASDC power when the arm was locked/unlocked were small.
This small difference results in such a small loss.
To see what was going on I will look at the trend data.

Quote from #5077 |
I did the measurement of the arm loss on both X and Y arm by running the armLoss script.
The results will be posted later.
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