[Dsg-rich] Optical tests complete for RICH mirrors 2C, 3C, 4C

[Tyler Lemon]

Dear Marco, 

We have completed the optical tests for mirrors 2C, 3C, and 4C. Optical tests are complete for 9 of 10 mirrors. Only mirror 5C remains. 

Data from the tests have been uploaded to: 
https://www.jlab.org/Hall-B/secure/clas12/RICH/Mirrors/CMA/ 

As was mentioned in the RICH weekly meeting last Friday, October 23, 2016, we also took d0 measurements for mirror 2C with the mirror in the vertical, 90 degree rotation position on the mirror stand. All other mirrors were just measured in the horizontal position. The d0 measurement results for mirrors 2C, 3C, and 4C are below. 

Mirror 2C: 
Horizontal Position: 
measured d0 = 1.190mm at z = 56.5mm 
fit d0 = 1.34mm at z = 56.48mm 
R = 2705.83 

Vertical Position: 
measured d0 = 1.211mm at z = 61.5mm 
fit d0 = 1.358mm at z = 61.69mm 
R = 2700.62mm 

Mirror 3C: 
measured d0 = 1.290mm at z = 60.5mm 
fit d0 at 1.402mm at z = 60.42mm 
R = 2701.88mm 

Mirror 4C: 
measured d0 = 1.390mm at z = 61mm 
fit d0 = 1.460mm at z = 61.09mm 
R = 2701.21mm 

For the upcoming tests for mirror 5C, should we also measure d0 with the mirror in the vertical position? Please let us know. 

We will continue the optical tests tomorrow. 

Best regards, 
Tyler 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-rich/attachments/20161025/4485832b/attachment.html>