alexan.staley@LIGO.ORG - posted 17:42, Tuesday 22 April 2014 - last comment - 08:55, Wednesday 23 April 2014(11516)
EY measurements
(Keita, Alexa)
A more in depth alog will be posted later about what we did today at EY. For now I have attached the data for the OLTF we measured (mag --> 122.txt, phase --> 123.txt). The UGF was about 2.3kHz with a phase margin of a little less than 60 deg. The phase shifter was adjusted to 23ns. The PDH REFL servo board settings were as follows:
- Input 1 gain: -7dB
- Input 1 pol: POS
- Common Comp: ON
- Boost 1: ON
- Boost 2: ON (same as boost 1 now)
- Fast gain: 0dB
- Fast pol: POS
- Slow option: enabled
We also measured the peak to peak of the PDH error signal and found it to be ~816mVpp.
Non-image files attached to this report
Comments related to this report
We remeasured the green power along ISCTEY (its possible we had the wrong laser setting on the powermeter when we measured this last):
- Out of laser: 32mW
- Before first Faraday: 29mW
- Out of first Faraday: 26.5mW
- After EOM: 25.5mW
- After second Faraday: 21.5mW
- Before pick off: 21.4mW
- After pick off: 18mW