[Hps] Electrons hitting the edge of the SVT Vacuum system.

[Stepan Stepanyan]

Maurik,

Thanks for nice pictures and clearing this up, at least for me. One 
thing I am still
not clear about if these two cases will go through the SVT system.

Stepan
On 7/23/14 12:55 PM, Maurik Holtrop wrote:
> Hello All,
>
> I took a quick look with GEMC to probe the edge where the full energy 
> beam electrons hit the edge of the SVT vacuum system.
>
> To the electron side (right) we grace the edge if the electron is at 
> theta=7.8 degrees, phi=172.7 degrees. This causes a hit on the edge of 
> the second column from the right, in row 2. So the last column is not 
> accessible, see figure 1.
>
> To the positron side (left) we grace the edge if the electron is at 
> theta= 14.3 degrees, phi=8.3 degrees. This causes hits in the fifth 
> column from the left, in row 2, so the left most 4 columns don't see 
> full energy hits.
>
> I would speculate that the hits in Luca's that were in the yellow 
> region get some hits directly, and also some hits that graced the edge 
> and so lost some energy, thus obscuring the nice peak.
>
> Best,
> Maurik
>
> Note: for the graphs below I set the GEANT4 cutoff energy at 40 MeV, 
> so that only higher energy tracks are shown. This cleans up the 
> picture a lot.
>
>
>
>
>
>
>
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