[Halld-offline] new position for 4th FDC package and updates to material maps

[Simon Taylor]

Hi, Dave.

That is correct.   If you only update hdds, then after recompiling in 
the hdds directory and and rebuliding HDGeant, the old reconstruction 
code (before this most recent update) should still work but the material 
map for FDC4 will be inconsistent with the xml geometry.    In order to 
get a fully consistent version you will need to update all three areas:  
hdds, sim-recon, and calib.

Please let me know if there are any problems arising because of these 
changes.

Simon



On 03/27/2012 10:04 AM, David Lawrence wrote:
> Hi Simon,
>
>     I just want to make sure I understand and that it is clear to everyone:
>
> If I now update any of HDDS, calib, or sim-recon, then I need to update
> all 3 to get a working version.
>
> Also, just a heads up to everyone, if HDDS and calib are out of alignment,
> programs should still run, but the results will be incorrect. Similarly for
> any existing .hddm files processed with an updated calib directory. The
> effect may be subtle so be careful!
>
> (Simon, correct me if I'm wrong.)
>
> Regards,
> -David
>
> On 3/27/12 9:50 AM, Simon Taylor wrote:
>> Hello, everyone.
>>
>> I have made an update to the ForwardDC_hdds.xml file to reflect the new
>> (final) position of the fourth FDC package, which has been moved 20 cm
>> upstream toward the target in order to minimize the impact of the
>> infamous 10 degree calorimetry hole.
>> I have also modified the material maps and the code needed to generate
>> these maps, obtain values from these maps and perform calculations using
>> the values from these maps by adding three additional columns that store
>> pre-computed values needed for the multiple scattering calculations in
>> the Kalman Filter.  The new material map for FDC4 is consistent with the
>> new position.
>>
>> Simon
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