[Halld-cal] Installation of monitoring boards

[Zisis Papandreou]

It looks so nice, it almost brought tears to my eyes!  One more giant 
step towards materializing the BCAL!

Cheers, Zisis...

Elton Smith wrote:
> Dear Christine,
>
> The forty monitoring boards arrived yesterday. After gluing two columns
> of light guides on the mini-Bcal and making all the wrappings, we went
> ahead and attached one string of LEDs to the light guides. See photos at
> https://halldweb1.jlab.org/wiki/index.php/Light_Guide_Information#Installation_of_Monitoring_Boards
>
> After some debate, but anxious to move forward with the gluing process,
> we installed the LED boards in the following way: A blob of UV-curing
> glue was placed on the PCB board behind the LED. The LED was then
> positioned on the edge of the hole away from the module. The glue was
> cured shining the light through the end of the light guide. This
> procedure should result in uniform behavior of all LEDs. The face if the
> LED should be clean. The light is directed toward the module and shines
> through the air inside the hole till it reaches the light guide. We have
> not tried this, but my guess is that we should be able to break off the
> board from the hole if we need to. Of course replacing a board with the
> light guides in place would be a challenge.
>
> Since we did not have the controller board and you tested the LEDs
> before shipment, we went ahead and installed them with out checking them
> again. (Hope they all work).
> The additional length of the cable between the LEDs seemed excessive at
> first, but we bent it around a small cylinder to avoid kinking it and
> installation went very smoothly. In fact the additional length helps
> plugging and unplugging the connectors. So the cable "pitch" and
> stiffness of the cable may be just fine.
>
> Comments and feedback is welcome, but we plan to continue with gluing
> light guides and installation of monitoring boards tomorrow.
>
> Cheers, Elton.
>