Reports until 10:06, Thursday 08 January 2015
H1 ISC
alexan.staley@LIGO.ORG - posted 10:06, Thursday 08 January 2015 - last comment - 10:10, Thursday 08 January 2015(15937)
Y arm IR low loss point and alignment repeated

Evan, Alexa, Thomas

We repeated the Y arm loss measurement that we did yesterday in alog 15919. We followed the same steps and found: green TR buildup was 1.018, IR TR buildup was 11.2(0.5), Poff = 1303(5), and Pon = 1251(5). This gives a loss of 155(19)ppm, which is still suffeciently low, and within uncertainity of yesterday's measurement. This confirms that we are aligned to a good spot, and there is no need to adjust the green QPD offsets.

Just for reference: when we run the ditherAlign TMSY script the maximum normalized PD1, PD4 values are 1.38(0.05), 1.09(0.05) respectively.  

Comments related to this report
evan.hall@LIGO.ORG - 10:10, Thursday 08 January 2015 (15938)
Link

Attached is a script which gives the algorithm for computing the loss. The uncertainties package is required.

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