[Olympus] Acceptance Simulations

[Axel Schmidt]

Hi Michael,
	Here are plots showing the effect of introducing gaps between the tof bars (B+ mode only).  I show two different binning schemes side by side.  
Cheers,
Axel

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On Nov 13, 2012, at 10:50 AM, Michael Kohl wrote:

> Dear Axel,
> 
> now that we run in B+ mode only for now, we need to have an estimate how 
> sensitive the ratio is to local variations in the efficiencies. Since the 
> target is extended and the angular binning is wide, the effect must be 
> suppressed. The arrival location of e+ and e- for identical kinematics 
> differs by a few cm.
> 
> For a simple worst-case check, could you introduce gaps of ~1-2 cm between 
> any two TOF bars (by making the active width of a bar smaller), simulate 
> (e+,B+) and (e-,B+), form the e+/e- ratio and compare the result with no 
> gaps between the TOF bars?
> 
> Likewise, a dead cell in the WC can potentially have a bad effect, too, 
> but would cancel if the e+ and e- tracks are still mostly hitting the same 
> cells for identical kinematics.
> 
> Best regards
>   Michael
> 
> 
> 
> On Tue, 13 Nov 2012, Axel Schmidt wrote:
> 
>> Hi folks,
>> 	Here are what I think are the most interesting plots from the Monte Carlo data I've produced so far.
>> 
>> - There are four plots, one for each species / polarity combination.
>> 
>> - Each plot shows the cross-section for both the lepton and proton to enter the wire chamber acceptance and then hit a ToF bar.
>> 
>> - Each plot has three series:
>> 	red - Detectors in current position
>> 	green - Detectors rolled out by 10cm
>> 	blue - Detectors rolled out by 20 cm
>> 
>> If you would like to see the MC data presented in another way, let me know.  In the meantime, I'm continuing to run the simulation to get more statistics.
>> 
>> Cheers,
>> Axel
>> 
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>> 
>> 
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> 
> +---------------------------------------------------------------------
> | Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
> | Physics Department, Hampton University, Hampton, VA 23668
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