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Entry  Thu Apr 18 20:47:54 2019, Joe, Optics, , OMC initial alignment and locking IMG_7676.JPGIMG_7666.JPGIMG_7670.JPGIMG_7883.JPGIMG_7882.JPG
    Reply  Fri Apr 19 11:34:19 2019, Koji, Optics, , OMC initial alignment and locking misalignment1.pdf
Message ID: 349     Entry time: Fri Apr 19 11:34:19 2019     In reply to: 346
Author: Koji 
Type: Optics 
Category:  
Subject: OMC initial alignment and locking 

The spot on CM1 was found displaced by 3.4mm (horiz.) and 3.0mm (vert.) in the upper right direction looking from the face side.
The spot on CM2 was found displaced by 1.2mm (horiz.) and 1.8mm (vert.) in the upper left direction looking from the face side.

The drawing on the left side of the attachment shows the estimated misalignment when we think they all come from the curved mirrors.
As for the yaw misalignment, CM1 and CM2 were 3.9mrad and 5.6mrad rotated (misaligned) in CW, respectively.
As for the pitch misalignment, CM1 and CM2 has 1.7mrad (narrowing) and 3.5mrad (widening), respectively. We have no adjustment for this.
Let's say if this comes from the dusts on the bottom of the prisms, CM1 has ~17um one, and CM2 has ~35um one beneath them. The question is if we can believe this or not? This should be checked with the Newton fringes we can see at the bottom of the prisms.

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