[Halld-offline] changes related to CDC geometry

[Richard Jones]

Hello all,

Just a heads-up that there might be problems with the new CDC geometry that Simon just checked in.  I have not checked it thoroughly, but from the comments I suspect that he might have removed a redundancy that I put in to make sure the Geant3 tracking works as intended.  I am in touch with Simon and David about it.

-Richard J.

On 11/20/2012 6:22 PM, Simon Taylor wrote:
> Hi.
>
> I have just checked in several changes to the CDC geometry:
> -- The sequence of angles of the stereo layers has been changed to
> conform to the engineering drawings (+--+ instead of -+-+)
> -- The positions of the first wires in each layer at the center of the
> chamber and the stereo angles have been modified to conform to the
> positions of the holes in the end plates according to the engineering
> drawings.
> -- The donuts and feed throughs have been added to the model
> -- a thin aluminum mesh for supporting the FDC cables has been added to
> the volume just outside the CDC
>
> I have also modified the following in the reconstruction code:
> -- In the HDGEOMETRY library, code has been added to extract the
> parameters for the CDC geometry from the XML
> -- In the CDC library, the code calls the geometry-extraction routine in
> DGeometry instead of using hard-coded numbers.
>
> mcsmear has also been modified to get the geometry for both the FDC and
> the CDC from the XML.
>
> Please let me know if you experience any issues related to these changes.
>
> Simon
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