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

[Zisis Papandreou]

Great news!  Another milestone reached and a few more coming this month...

Cheers, Zisis...

> Elton Smith <mailto:elton at jlab.org>
> March 11, 2012 3:13 PM
> 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.
>
>
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