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Question Strange trajectory of electron in serrations 

Forum: Event and Track Management
Date: 22 Jul, 2017
From: John Liu <John Liu>

Dear All,

I am designing a surface with serrations to stop electrons from reflecting on it.

The attached figure shows the configuration: the grey part is the surface with serration, whose material is Aluminum (G4_Al); the white area is vacuum (G4_Galaxy). The red line is the electron's trajectory.

I expected the electron to reflect on the serration and get absorbed by the aluminum after at most two reflections.

However, the simulation shows that it passes through the aluminum several times. The trajectory shows that the step length is small enough.

What could be the cause for this strange trajectory? The physics list I used is "Shielding".

Thank you very much, John

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/07/22/16.15-3548-G4event.png

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