[Dsg-rich] optical tests for RICH spherical Mirror 4 complete

[Amrit Yegneswaran]

great work tyler and amanda. 
have a nice weekend and wish you guys 
a happy independence day "She's a grand old rag. " 


From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Friday, June 30, 2017 2:52:16 PM 
Subject: [Dsg-rich] optical tests for RICH spherical Mirror 4 complete 

Hello Marco Mirazita and Marco Contalbrigo, 

Amanda and I have completed the optical tests for RICH spherical mirror 4. At Marco Contalbrigo's advise, we used a longer exposure times of 1ms to 5ms for the Shack-Hartmann sensor. If longer exposure times are still needed, we can repeat the Shack-Hartmann measurements again with longer exposure times. 

All data from the tests have been posted with previous results. A link to the Mirror 4 data from today is below. 
https://www.jlab.org/Hall-B/secure/clas12/RICH/Mirrors/CMA/coated_mirrors/CMA_4_2017-06-30/ 

The D0 measurement results are: 
Fit-D0 = 1.78 mm 
Fit-R = 2718.02 mm 

In comparison, the uncoated Mirror 4 results were: 
Fit-D0 = 1.40 mm 
Fit-R = 2701.02 mm 

Since the data from the uncoated mirror resulted in a smaller D0 measurement and a radius closer to 2700 mm, should we plan to repeat the measurements with the coated mirror 4 to ensure the results are correct? 

Please let us know. 

Best regards, 
Tyler 

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