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Entry  Wed Apr 27 16:28:57 2022, Anchal, Summary, BHD, BHD Upgrade - Retreiving arm cavity alignment 
    Reply  Thu Apr 28 09:12:18 2022, Anchal, Update, BHD, Restoring arm alignment 
       Reply  Thu Apr 28 18:07:04 2022, Anchal, Update, BHD, Restoring arm alignment at EOD 
Message ID: 16815     Entry time: Wed Apr 27 16:28:57 2022     Reply to this: 16816
Author: Anchal 
Type: Summary 
Category: BHD 
Subject: BHD Upgrade - Retreiving arm cavity alignment 

[Anchal, Paco, JC]

We had to open ITMY, ETMY chamber doors to get the cavity aligned again. Once we did that, we regained cavity flashing and were able to align the input injection and cavity alignment to get transmission flashing to 1.0 (C1:LSC-TRY_OUT_DQ). JC later centered both ITMY and ETMY oplevs. The ITMY oplev had become completely out of range.

We also opened ITMX, ETMX chamber doors to get Xarm alignment. Again, it seems that ITMX had moved a lot due to cable post installation.

To be continued

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