J. Oberling, R. Kumar, B. Weaver

We took a look at pitch and yaw yesterday, and found both to be off from where we had left it last week.  Pitch was ~10.4 mrad up and yaw was ~1.0 mrad CW.  The pitch move was likely due to the large vertical adjustment from last Friday, but the reason behind the yaw move is unknown.  After several adjustments, we left things yesterday with pitch at ~10 µrad down and the yaw at ~15 µrad CW.  Betsy and Rahul had some OSEM work to do, so we left things there yesterday.

For today, we took one last look at pitch and yaw to see where things stand after the OSEM work.  However, no correction will be made to these measurements, they are only a data point once we return to FC1 IAS.  There is work in HAM4 that needs to be started (which the IAS equipment blocks) and some issues with FC1 TFs that need to be sorted out before we can finalize FC1 alignment.  This final pitch and yaw measurement is:

• Pitch: 190 µrad down
• Yaw: 10 µrad CW

The IAS equipment has now been moved to facilitate HAM4 door removal, and we will return to FC1 IAS in a few weeks (once HAM4 work is done and the FC1 TF issue is resolved).