[Halld-offline] major upgrade to FCal geometry description

[Richard Jones]

Hello Matt,

Based on your email from about 6 weeks ago (sorry it took so long) I have
made the following changes to the FCal description in hdds. The addition of
a major amount of material in front of the blocks may or may not produce
observable effects in the efficiency/resolution. Please have a look at the
pull request on github and offer comments or suggestions.

https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_hdds_pull_35&d=DwIBaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=oyKV5joTkJsuRYv6hh48IMTw3i-IrYD-ZUAHHU0DdAY&m=lF56AocnTo9fqTgEyTMChEg4yhMfClykFEa6kssuTGk&s=tQotVPH1bhNONXwM2-2HwZyQjWbiI8pI9SZuOxGtBNk&e= 

The only thing you highlighted that I did not include is the light cover
over the front of the blocks. I could not find any documentation on what
this was made of or its thickness, but I surmised that it is probably a lot
less than the 0.5" plexiglass sheet, so I just put in the plexi sheet and
left it at that. If tell me how much, I can increase the thickness of the
plexi a bit to account for the material in the front light cover.

-Richard Jones
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/halld-offline/attachments/20170713/16492989/attachment.html>