Re: scintillators

[John Blackburn <jblackbu@uiuc.edu>]

Hi Peter,

Dave is correct on how it's done.  LIGHTLY go over both surfaces to 
be glued with 600 grit sand paper, ~3-5 times.  You will notice that 
the gluing surface is now slightly hazy and slightly scratched.  This 
is what you want.  It really goes against my nature to take a highly 
polished surface and scratch it up.... but that is the way it's 
done.  The joint is now prepped and ready to be glued.  I'll send a 
few sheets of sandpaper  along with the spare gondola.

I had to remake a shipping crate to ship the gondola in.  We used the 
spare gondola box for shipping the ndet upgrade parts . I guess 
"robbing Peter to pay Paul" didn't pan out.  I should have guessed.

Please pass on the shipping crate information to Penny so she can 
prepare the shipping invoices/documents.

Crate size: 32"High x 54" x 18"
Crate weight: 128 lbs.
Crate contents: Spare gondola, 600 grit sandpaper

Thank you,
John Blackburn



At 11:11 AM 7/27/2005, you wrote:
>Thanks John,
>
>Dave also mentioned that the glueing to the scint surface could
>be improved by briefly sanding the surface.
>
>Could you define this procedure and prepare some correct sanding
>paper to ship that to Francoise.
>
>I will come by Monday morning and get the spare gondola box (or could
>you bring it to physics)?
>
>Best regards
>
>Peter
>
>On Wed, 27 Jul 2005, John Blackburn wrote:
>
>>Hi,
>>When we made the  light guides for mucap we sent the light guide 
>>strips out to bid.  I faintly recall "Acrylite GP" being the 
>>acrylic of choice.  I have attached PDF's of the chemical 
>>resistance and light transmitance values for Acrylite GP.
>>
>>When cleaning acrylic strips we generally use ethanol.  If the 
>>acrylic was machined under stress then cleaning with ethanol will 
>>make the material "craze".
>>
>>Brendon is correct about the gluing procedure.  Shoot the UV 
>>lamp/wand through the light guide.
>>
>>At 03:38 PM 7/26/2005, you wrote:
>>>Dear Francoise,
>>>The Bicron data sheet 
>>>http://www.detectors.saint-gobain.com/Media/Documents/S0000000000000001004/SGC%20Handling%20and%20Cleaning%20Plastic%20Scintillators%20Information%20Sheet.pdf
>>>recommends lower alcohols, which includes ethanol.
>>>I am not aware of any problems conc acrylic light guides.
>>>Tomorrow two sales reps from Bicron will visit us, so
>>>we can check with them.
>>>I will also check this with John.
>>>Brendan suggested to try to cure the glue shining through
>>>the light guide, to make sure that the lighht guide does
>>>not cut off the the UV-A. Good idea.
>>>So I don't think we have a problem.
>>>Regards
>>>Peter
>>>-------------------
>>>Dear John,
>>>Could you please call me tomorrow to comment.
>>>i)  ethanol ok?
>>>ii) is the MuCap light guide UV transmittant?
>>>Thanks
>>>Peter
>
>Peter Kammel  /  pkammel@uiuc.edu
>Department of Physics, Loomis Laboratory
>University of Illinois at Urbana-Champaign
>1110 West Green Street, Urbana, IL 61801
>Tel (217) 333-5424 / Fax (217) 333-1215