Reports until 17:31, Friday 26 May 2017
H1 ISC
jeffrey.kissel@LIGO.ORG - posted 17:31, Friday 26 May 2017 - last comment - 17:59, Friday 26 May 2017(36461)
Recovery Update: Made it to Power increase and Low Noise ASC -- Updated Green Alignment References
V. Adya, S. Dwyer, K. Izumi, J. Kissel, P. Thomas

After doing the same kind of alignment reference adjustment to the POP QPDs -- i.e. moving around PR2, we were able to surpass yesterday's problems and get through the CARM reduction and closing the ARM's SOFT loops. As such, while holding just before the transition to DC READOUT, we captured new green alignment offsets (updating green QPD offsets and green camera offsets). I attach the relevant screenshots showing the deference between the previous values and the old values. Y arm QPD B Yaw moved the most. The changes to the green camera offsets where in the same direction and rought the same value to which Sheila and I adjusted the offset manually last night.

We lost lock due to a dP/dTheta 0.45 Hz oscillation, and are re-running initial alignment, and trying again.

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aidan.brooks@LIGO.ORG - 17:59, Friday 26 May 2017 (36462)

I've just analyzed HWSX - the point absorber is still present in the same spot with the same scale, I'm afraid.

More to come as I get more information.

 

 

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