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

[George Lolos]

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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