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Forum: Biasing and Scoring
Re: Question simulation gets stuck for small pixel size (A. Hod)
Date: 31 Jan, 2017
From: Marc Verderi <Marc Verderi>


I would suggest to post your message in the "Geometry" forum. Do you have any output (tracking/verbose) when the simulation gets stuck ? Have you seen if this is for example zero length steps occurring ?

Cheers, Marc

On Wed, 18 Jan 2017 12:41:04 GMT, A. Hod wrote:

> Dear G4 users,
> I encountered one problem with scoring mesh. I have the following setup:
> 10 nm thick SiN layer ( box of 200 nm x 200 nm x 10 nm). This layer is
> in a vacuum environment.
> An ideal detector is positioned directly on the bottom of SiN layer and
> it is divided into 200 x 200 pixels using scoring mesh (pixel size is
> 1nm x 1nm). An electron beam of 10 keV is used to irradiate the SiN
> layer. I want to calculate the number of electron reaching the pixels
> using scoring mesh (e.g. flatSurfaceCurrent. This works nicely for large
> pixel sizes but using small pixel size as described in this post does
> not work. The simulation gets stuck after some thousands events. This
> happen every time when I make the pixel size smaller. Is there a pixel
> size limit in geant4?
> Thanks in advance I look forward to receive your helps and suggestions.
> Cheers
> A.H.

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