[Dsg-rich] RICH spherical mirrors 3 and 4 recieved from ECI

[Amrit Yegneswaran]

perhaps, the delicate mirrors should be shipped in reinforced cardboard boxes. 


From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Friday, June 16, 2017 12:32:10 PM 
Subject: [Dsg-rich] RICH spherical mirrors 3 and 4 recieved from ECI 

Hello Marco Mirazita and , 

We received RICH spherical mirrors 3 and 4 today from ECI. As last time the mirrors were received we opened and inspected them in EEL 121 DSG small clean room. Attached are pictures from the inspection. Because of the large attachment size, I have also posted the pictures to my userweb page at the link below in case the attachment cannot send: 

https://userweb.jlab.org/~tlemon/RICH_spherical_mirrors_3_and_4_recieved_from_ECI_2017-06-16/ 


Our findings from the inspection are: 

Shipping box and packaging: 
1.) The exterior shipping box looked as if it was crushed during shipping however, all interior boxes were in better condition. 
2.) Each mirror was packaged separately in its own box and that box was wrapped in bubble wrap. 
3.) Within each individual box, the mirrors were sealed in the same silver bag as we received them in from CMA in 2016. 
4.) Mirror 4 had additional cushioning and padding in its individual box. 
5.) Mirror 3 had no additional padding it its individual box. 

Mirror 3: 
1.) One of the screws used to mount the mirror to its support structure was poking through its sealed silver bag. 
2.) One corner of the mirror was not resting on a foam pad. 
3.) One of the screws used to mount the mirror to its support frame had snapped off where it was screwed into the mount during shipping. 
4.) There appeared to be scratches and scuffs on the reflective surface of the mirror. 

Mirror 4: 
1.) Two of the screws used to mount the mirror to its support structure was poking through its sealed silver bag. 
2.) One of the screws used to mount the mirror to its support frame had snapped off where it was screwed into the mount during shipping. 
3.) There appeared to be scratches and scuffs on the reflective surface of the mirror. 
4.) There was one small pocket (~2 mm in size) on the reflective surface of the mirror. 

Regarding the scuffs, they may be leftover residue from the coating process. We did not attempt to clean the reflective surfaces to avoid damaging the surface. 

Regarding the two broken screws, it looks that we might be able to remove the broken portion of the screw and use a new threaded rod. Would CMA be able to send us at least two more of the plastic threaded screws? 

Marco Contalbrigo, 
Since you are at JLab for the collaboration meeting, if you would like to inspect the mirrors also, the mirrors are stored in the DSG small clean room. 

Best regards, 
Tyler 

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