Re: updated geometry

[Richard Jones <richard.t.jones@uconn.edu>]

Beni, some work is still needed on this geometry.  The following items
are invalid, so that no particle will ever be able to enter their
volumes.  This is not a comprehensive list, just the result of a quick
spot check I did.  I have a tool that can enables a quick
point-and-click check on individual volumes.  I can show you how to use
it, if you are interested.

1. FDC cables re-routed to run upstream
2. 8mm aluminum plate in front of BCAL

That aluminum 8mm plate will completely wipe out the BCal resolution,
once it is in there!  For the moment, however, it causes no problems at
all, because particles do not see it. 
:-) 

-Richard Jones


Beni Zihlmann wrote:
> 487521E3.10403@jlab.org">Dear
> colleagues,
>   
> I updated the geometry in the repository. The geometry now reflects
>   
> all the changes and design decisions that have been made lately.
>   
> 1) remove outer most CDC layer thereby reducing the CDC radius by 1.6
> cm
>   
>    including the cable runs.
>   
> 2) re-route the FDC cables to run upstream
>   
> 3) add an 8mm aluminum plate on the inside of the BCAL
>   
> 4) the BCAL readout segmentation is 4x6 (sector x layer)
>   
>   
> all these changes are now available the in geometry file hddsGeant3.F
> located in
>   
> src/programs/Simulation/HDGeant/
>   
>   
> cheers,
>   
> Beni
>   
>