sheila.dwyer@LIGO.ORG - posted 21:36, Friday 10 July 2015 - last comment - 21:09, Monday 13 July 2015(19562)
OMC fringe wrapping
Nic, Sheila
We put an excitation into the HAM6 ISI ISO Y filter bank, (30000 counts at 0.3 Hz) from about 3:17-3:19 UTC July 11. We then did a by eye fit (on a log log scale)for a fringe wrapping model. We expected the excitation to result in 30 um motion of the OMC, but we had to use 36 um to get the fringe speed right. We get an amplitude reflectivity of 1.6e-7 for the single pass shelf. (compare to 1e-5 measured in 17919) We see no evidence of a second shelf or a shelf in the null stream.
We plan to make measurements in exactly the same was as 17919, if we get a chance again tonight.
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There is a typo in this alog, the reflectivity is r=160e-7, as the legend in the plot says, not 1.6e-7 as I wrote.