[Halld-cal] Installation of monitoring boards

[William Brooks]

VERY nice pictures!

On Mar 8, 2012, at 6:52 AM, Christina Kourkoumeli wrote:

> Thank you,Elton.These are wonderful news!
> Cheers,
> Christine
> On 7/3/2012 11:52 μμ, 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.
>> 
> 
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