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Entry  Mon Jul 14 19:15:43 2008, Alberto, Update, General, abs cavity length measurement experiment 
    Reply  Mon Jul 14 21:34:10 2008, Alberto, Update, General, abs cavity length measurement experiment 
Message ID: 669     Entry time: Mon Jul 14 21:34:10 2008     In reply to: 668
Author: Alberto 
Type: Update 
Category: General 
Subject: abs cavity length measurement experiment 

Quote:
Lately I've been dealing with the alignment of the interferometer to have a good beam spot at the AS port. Today the alignment script kept failing because of computer problems (failure of the frame builder) and also because the IFO was probably too far from the range where the automatic alignment works.

An other problem I keep having with the alignment of the optics on the AP table is with multiple reflection beams of the NPRO beam at the Farady.
Although I believe that now the two beams are quite well aligned, I don't see any reflection of the secondary beam from the IFO anymore.

It's like the more I try to improve the alignment, the worse I get from the beam matching. I'll keep working on this.


Realigning the OSA I also had to move a little bit the mirror that reflects the IFO beam of at the AS port in order to raise the beam height. This had the effect of changing the position of the AS spot on the camera and on the monitors.

Tonight with John, we made sure that the AS beam was still aligned to the PD.
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