[Olympus] Acceptance Simulations

[Michael Kohl]

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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| Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
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