[Clas12_high_luminosity] Simulation Update

[burkert]

Whitney,

Thanks for your response. The graphs are of interest, however, I believe 
they are not the same as the ones Mauri is showing. Mauri can correct 
me, but I think he is plotting the z position along the beamline where 
any of the hits in the chambers originated from. This allows one to 
determine the material around the beamline that caused the hits even if 
it goes through secondary and tertiary stages. You expect then a peak at 
the target for direct hits, and hits coming. e.g. from Moeller electrons 
produced in the target but hitting a beamline element further downstream 
that causes a shower and subsequently hits in the chambers.  Such a 1-D 
plot will allow us to compare your simulations with Mauri's and identify 
structures along the beam that may present obstacles to the Moeller 
electrons.

Volker




On 2/11/16 8:42 PM, Whitney R. Armstrong wrote:
> Hi Volker,
>
> I have produced two graphs, however, with limited statistics (~1.5M). 
> Many more jobs are running on the farm right now.
>
> The first shows (in cylindrical coordinates) the radial vs z position 
> of the starting point for the trajectory that ultimately produced at 
> hit in the DC.
>
> The second shows the wire number of the DC hit vs the same z as above.
> I will post these results on the wiki when I have gathered more 
> statistics.
> Your comments and questions are appreciated.
>
> Cheers,
> Whit
>
>
> On Thu, Feb 11, 2016 at 08:37:45AM -0500, burkert wrote:
>> Hi Whitney,
>>
>> Could you produce a graph similar to the one from Maurizio (attached) 
>> showing where along the beamline (z-coordinate) the chamber hits 
>> originate from.
>>
>> Volker
>>
>>
>> On 2/11/16 1:41 AM, Whitney R. Armstrong wrote:
>>> Dear Collaborators,
>>>
>>> First, I have posted some follow-up slides to our discussion on 
>>> Monday. The new plots have a hit definition that is consistent with 
>>> Maurizio's.
>>> You can find my slides and the follow slides at 
>>> https://clasweb.jlab.org/wiki/index.php/CLAS12_High_Luminosity_-_February_8,_2016
>>>
>>> Secondly, as suggested by Latifa, I have performed a self 
>>> consistency check using the beam on target method previously used. 
>>> Furthermore, I am using the same beamline geometry as Maurizio, who 
>>> has graciously provided a GDML version of the geometry.
>>>
>>> Please see the following page for the latest results and discussion 
>>> of the simulations. 
>>> https://clasweb.jlab.org/wiki/index.php/CLAS12_Drift_Chamber_Occupancy_Simulations
>>>
>>> So far the main conclusions are that my simulation is self 
>>> consistent, and perhaps more importantly, I am getting significantly 
>>> larger DC occupancies.  The cause of this discrepancy remains unclear.
>>>
>>> Any comments or questions are greatly appreciated.
>>>
>>> Cheers,
>>> Whit
>>>
>>>
>>
>
>
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