Re: bcal lightguides

[Elton Smith <elton@jlab.org>]

Hi Mihajlo,

Thanks for the plot. It gives us a useful comparison. I will show this
tomorrow at the Bcal readout meeting if it is ok with you.

Cheers, Elton.




Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton@jlab.org
(757) 269-7625
(757) 269-6331 fax

On Wed, 1 Jul 2009, Kornicer, Mihajlo wrote:

>
> 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
> >
> >
>
>
>
>