Re: bcal lightguides

["Kornicer, Mihajlo" <mikornic@indiana.edu>]

Hi Alex,

please find a link to the photon-efficiency plot

http://www.jlab.org/Hall-D/software/wiki/images/b/bb/PhotonEfficiency_Jun09.pdf

with comparison of current and new geometry with light guides 
(comparison was done for regular read out, not 3x3). The plot was made 
for 1.0 GeV photons, if reconstructed with polar angle within 0.05 
degree of generated photon and with energy less than 3sigma from 
generated energy. Sigma is detector dependent resolution.

Let me know if this looks OK and if you need anything else.

Cheers,
Mihajlo


Quoting Alexander Somov <somov@jlab.org>:

>
> Hi,
>
> I put geometry files with light guides in the downstream
> end of the bcal corresponding to  the fine-mesh pmt readout to
> http://www.jlab.org/~somov/bcal_lightguides/
>
> The light guides in these files are simply modeled as the three plexiglas
> polycon volumes. That is probably good enough to study the effects of
> material...
>
> Cheers,
>        Sascha
>
>
> P.S. I also have a bit better description of the light guide geometry
> where each light guide is modeled as a set of rectangles. This geo was
> used to study em bg (propagating optical photons in light guides in geant)
> We can discuss it during the meeting tmorrow
>
>