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

[Patrizia Rossi]

Excellent Tyler and company!

These data are very important for my visit to the CMA

patrizia 
---------------------------------------------------
# Patrizia Rossi
# Jefferson Lab 
# 12000 Jefferson Avenue
# Suite 5
# Newport News VA 23606 (USA)
# e-mail: rossi at jlab.org
# phone: +1 (757) 269 7740
# fax: + 1 (757) 269 5800
# cell: +1 (757) 528 7606




> On 22/ago/2017, at 17:02, Tyler Lemon <tlemon at jlab.org> wrote:
> 
> 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
> <Mirror4_2017-08-22_spot9.xlsx><Mirror4_2017-08-22_spot8.xlsx><Mirror4_2017-08-22_spot7.xlsx><Mirror4_2017-08-22_spot6.xlsx><Mirror 4 reflectivity test locations for visibly bad areas.JPG>_______________________________________________
> Dsg-rich mailing list
> Dsg-rich at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-rich

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_rich/attachments/20170822/6cbc6df5/attachment-0002.html>