[Dsg-rich] Mirror 4 reflectivity results for visibly bad areas

[Tyler Lemon]

Hello Dr. Rossi, 

Attached are four reflectivity measurements for spots that visibly seem to be bad. The attached JPG shows the approximate location of the spots measured. 

Spot 7 corresponds to the area on the mirror where there is a small area without any reflective coating. All other spots were areas that looked smudged. 

The reflectivity measurements in these spots are lower, as expected, with spot 7 being the worst with a reflectivity of ~63%. 

We also took two calibration runs to ensure that photodiode A (the control photodiode) is stable and gives the similar results for every measurement. We are still in the process of looking at the calibration results and comparing photodiode A measurements, but just looking at the data, it appears that photodiode A was more stable for measurements of spot 7, spot 8, and spot 9 than the previous measurement set. 

Tomorrow we will measure a two more bad spots on mirror 4 and also repeat the previous measurement for Mirror 4 where we got an unexpected result. We will also measure bad areas of Mirror 3. 

Best regards, 
Tyler 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170822/26d4b9a7/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mirror4_2017-08-22_spot9.xlsx
Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Size: 21928 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170822/26d4b9a7/attachment-0004.xlsx>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mirror4_2017-08-22_spot8.xlsx
Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Size: 21929 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170822/26d4b9a7/attachment-0005.xlsx>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mirror4_2017-08-22_spot7.xlsx
Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Size: 21972 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170822/26d4b9a7/attachment-0006.xlsx>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mirror4_2017-08-22_spot6.xlsx
Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Size: 20997 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170822/26d4b9a7/attachment-0007.xlsx>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mirror 4 reflectivity test locations for visibly bad areas.JPG
Type: image/jpeg
Size: 24722 bytes
Desc: not available
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20170822/26d4b9a7/attachment-0001.jpe>