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Question Scattering off from vacuum surface? 

Forum: Event and Track Management
Date: 18 Dec, 2017
From: Ting Lin <Ting Lin>

Hello there,

I am trying to simulate a mesh electrode that "absorbs" 20% of the incoming ions but do not change their trajectories otherwise. To do this, I made a "G4VSensitiveDetector" out of "vacuum" material, so that I can stop the incoming particle 20% of the time. However, the incoming ion is scattered off from the vacuum to vacuum surface, and I am not sure how to correct that.

The attachment show the incoming ion "red curve" entering from the right and exist on the left. The region between the vertical green lines is the electrode; vacuum is assumed both inside and outside of the electrode. The white dot is the position where the ion enters in the electrode, and the blue dot is when the ion exist.

Thanks in advance, Sincerely Ting Lin

Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/12/18/19.15-3445-G4Sample.png

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