[Halld-cal] Light guides have been glued onto mini-Bcal

[Elton Smith]

Hi Will,

Indeed, dimensions become an urgent issue to settle. I will be looking 
into the measurements today.

Thanks, Elton.

On 3/12/12 9:37 AM, William Brooks wrote:
> It is good news. However, we need to know asap if the lightguide dimensions will be changing......or the tolerances, e.g. to an asymmetric tolerance...since we're making them now....
>
> thanks,
>
>   - Will
>
>
> On Mar 11, 2012, at 5:29 PM, George Lolos wrote:
>
>> Great news.  Next it will be great to hear that all LED's work and the miniBCAL is ready.  It's good the problem with the lightguides and the width surfaced now.
>>
>> George
>>
>>
>> Sent from my iPod
>>
>> On 2012-03-11, at 15:13, Elton Smith<elton at jlab.org>  wrote:
>>
>>> Dear collaborators,
>>>
>>> We completed gluing all light guides onto the mini-Bcal on Friday. Some
>>> photos are available at
>>> https://halldweb1.jlab.org/wiki/index.php/BCAL_Beam_Tests_2012#Photos_and_Plots
>>>
>>> By-in-large the process was a success. All guides fit together very well
>>> and the monitoring boards arrived from Athens just in time to attach
>>> them to the center two columns on both sides. The gluing procedure
>>> proceeded one guide at a time, where we hope to develop a production
>>> scheme that allows us to glue one column at a time. We are improving the
>>> tooling to accomplish this goal.
>>>
>>> In the process of mounting the Bcal monitoring boards one LED broke off,
>>> so we have one missing board on the K guide next to the missing guide
>>> where we still have access. Christina has sent us some spare LEDs to
>>> repair the broken board. As far as we could tell we did not bump or
>>> mistreat that LED board, so we are not sure why the LED broke off.
>>>
>>> One concern is the width of the light guides relative to the mini-Bcal.
>>> We started gluing the left-most column and, by design, its edge is
>>> starts 0.5 mm inside the module. This ensures that the placement of an
>>> adjacent module (in the full experiment) is not impacted. However, the
>>> edge of the right-most column extends beyond the right side of the
>>> module by about a 0.5 mm. This is not a problem for the present ectype,
>>> but we need to understand why the complement of light guides are not
>>> undersized. We took measurements of each light guide and the mini-Bcal
>>> and will check where the dimensions are slightly off. The design left
>>> some slight gaps for the glue and we do not think these have been exceeded.
>>>
>>> More discussion on this later.
>>>
>>> Cheers, Elton.
>>>
>>>
>>> -- 
>>> Elton Smith
>>> Jefferson Lab MS 12H5
>>> 12000 Jefferson Ave
>>> Suite #16
>>> Newport News, VA 23606
>>> (757) 269-7625
>>> (757) 269-6331 fax
>>>
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