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Message ID: 12792     Entry time: Thu Feb 2 18:32:51 2017
Author: rana 
Type: Summary 
Category: PSL 
Subject: PMC alignment 

Re-aligned the beam going into the PMC today around 5 PM. I noticed that its all in pitch and since I moved both of the mirrors by the same amount it is essentially a vertical translation.

I wonder if the PMC is just moving up and down due to thermal expansion in the mount? How else would we get a pure vertical translation? Need to remember next time if the beam goes up or down, and by how many knob turns, and see how it correlates to the lab temperature.

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