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Message ID: 10302     Entry time: Thu Jul 31 01:08:54 2014
Author: Koji 
Type: Update 
Category: LSC 
Subject: ALS stability check 

- ALS X/Y arm stability was checked by IR locked arms.

- Basically the stability looks same as before.

Q sez: here are some ALS ASDs (in Hz/rtHz). 

The reference plots are with the arms locked on CARM/DARM with ALS. The main traces are with the arms locked on POX/POY. Alignment affects these traces a fair amount.

postXGreenUpgradeCheckup.pdf

The X arm ALS seems no worse for the upgrade, and the PZT actuators do look pretty orthogonal when we play around with the alignment. 

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