[Halld-cal] acrylic sheets for Fcal monitoring system

[Elton Smith]

Hi Matt,

We have found that Eljen will sell us sheets of UVT acrylic if we update 
the drawings so that they can be cut out of 4'x8' material. Chuck is 
updating the drawing to make them fit and we will get a quote.

Thanks, Elton.

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

On 7/24/13 5:51 PM, Elton Smith wrote:
> Matt,
>
> We are trying to converge on properties for the acrylic sheet for the 
> Fcal monitoring system that is available and affordable.  At first we 
> investigated the availability of UVT for two reasons
> 1) make sure there is good transmittance of the UV laser light
> 2) this material is environmentally more stable than UV absorbing 
> acrylic that yellows over time.
>
> We have had no success with finding sources of UVT acrylic in 1/2" 
> thickness without ordering large batches. The UV-violet LED for the 
> monitoring system is at 405 nm, which is mostly within the 
> transmission window of UV absorbing acrylic. Also the tests in Athens 
> were conducted with UV absorbing plastic.  Therefore we are 
> investigating options for purchasing UV absorbing 1/2" plastic.
>
> We will also need to adjust the clamps on the panes so that we 
> accommodate the use of 4'x8' sheets of material. It is unclear what 
> the availability is of larger sheets (e.g. 51"x51", which was used for 
> testing in Athens).
>
> Let me know if there are any comments or concerns to this course of 
> action.
>
> Thanks, Elton.
>