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None Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks 

Forum: Biasing and Scoring
Re: Question Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks (Joseph DeCunha)
Re: None Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks (Makoto Asai)
Re: None Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks (Joseph DeCunha)
Date: 28 Jun, 2016
From: Makoto Asai <Makoto Asai>

You may want to try defining your spherical mesh made of G4Orb and place a smaller G4Orb object as a daughter of the mother G4Orb object rather than using parameterized volume and placing G4Sphere touching to each other. Touching surface of the inner surface of the larger spherical shell and the outer surface of the smaller sphere is always a difficult situation for the navigator due to the numerical rounding errors.

Fate of a track in terms of which physics process actually happens is determined at the beginning of that track so that number of steps does not affect to it. But for every "along-step" physics processes such as ionization, we use random numbers to fluctuate energy deposition, etc., thus we consume random numbers. Thus, the random numbers used to determine the fate of the next track are affected by the number of steps of the previous track. This part is described in the application developers guide. Physics reference manual describes details of each physics models we use.

Makoto

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1 Question: Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks   (Juliana Cristina Martins - 05 Feb, 2018)
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