Re: updated geometry

[Beni Zihlmann <zihlmann@jlab.org>]

Hi Richard and All,
indeed I forgot to adjust the overall module volume to accommodate for 
the inside aluminum plate. I can/will
fixt that in a second.
But now I have a question to your comment. I agree that an 8mm aluminum 
plate inside the BCAL surface will
degrade the resolution but that is exactly what is in the drawings to 
build the BCAL and Elke asked me to put
it into the geometry. Don't we want to have the studies to be made by 
Matt et al. having a geometry as close
as possible to reality?

cheers,
Beni

Btw. yes I am really interested in your tools.


Richard Jones wrote:
> 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:
>> 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
>>
>


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