[Dsg-rich] RICH spherical mirror 4 reflectivity test

[Tyler Lemon]

Hello, 

This morning Mindy and I took reflectivity measurements for RICH spherical Mirror 4. 

As the mirror will soon be shipped to CMA, we wanted to finish taking reflectivity measurements for Mirror 4 to give us a reference for the mirror when it returns to JLab. 

We measured Mirror 4's reflectivity in two spots. The location of these spots are noted in the attached "Mirror 4 reflectivity test locations.JPG". 

Just looking at the data, Mirror 4's reflectivity for spot 1 is between 87% - 89%. 

For spot 2 the reflectivity is between 79% and 81%. The lower reflectivity for spot 2 could be from an area of poor surface quality or a misalignment in the test station optics. 

Best regards, 
Tyler 
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