sPHENIX EMCal discussion

["Phipps, Michael William" <mphipps2 AT illinois.edu>]

Hi All,

I came across an interesting lightguide paper that fits well with our recent 
discussions. It's a 1993 SSC paper written by David Hertzog and co at 
Illinois (apparently not the first time lightguides on SCIFI calorimeters 
have been studied at UIUC). The paper shows a few different things:

- it confirms the angular distribution profile I've been using for light 
exiting the fibers
- it studies efficiency/uniformity for a series of different Winston cone 
designs (including short Winston cones)
- it studies lightguides wrapped vs unwrapped with reflector (including 
differential wrapping to correct for asymmetries)

I'm away from UIUC for the next month and it's going to hard to make much 
progress on simulation studies, but I may be able to find a little time to 
build a few of these Winston cone geometries into my Geant simulations.

Anyway, in the meantime, please take a look: 
http://www.sciencedirect.com/science/article/pii/016890029390259K

Cheers,

Mike