[Halld-cal] Final decisions on FCAL LEDs for monitoring

[Elton Smith]

Dear Christina,

At the Calorimeter Working Group meeting today Stratos showed the 
results of your measurements of the illumination of the FCAL LEDs. Based 
on the presentation and the discussion at the meeting, it is clear that 
the proposed configuration will meet our requirements for dynamic range 
and uniformity. We agreed that you should proceed with production.

Thanks for all your hard work. Cheers, Elton.

Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave STE 16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax

On 2/26/13 1:48 PM, Elton Smith wrote:
> Dear Christine,
>
> In order to have a record of our decision, I am sending this to the 
> halld-cal mail server.
>
> During the collaboration, we came to a consensus regarding which LEDs 
> to be included into the FCAL Quad LED boards:
> - 1 violet @390 nm
> - 1 blue @ 470 nm
> - 2 green @574 nm (firing these in unison will allow for twice the 
> normal intensity)
>
> Christina and her team will confirm our expectations with the 2 green 
> LEDs firing at the same time and follow this plan if no problems are 
> found.
>
> The length of the cables from the quad LED boards to the controller 
> will be made 4 m long.
>
> Cheers, Elton.
>