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None command based scoring problem 

Forum: Biasing and Scoring
Date: 13 Aug, 2017
From: Huagang Yan <Huagang Yan>

We are using a box mesh (command-based scoring) to calculate the dose distribution of a complex structure, in which there are many irregular volumes and the mesh may cross several volumes. When the number of primary photons was small, everything went well.

However, when the number of photons was about 50000 or more, and the bins of boxmesh were something like 100 100 2, the program cannot output score files, it is like lasting forever. However, the usage of CPU had gone down which indicated that the simulation of physics processes might have ended, but it couldn't completely finish and no score files were generated.

We don't think this is a problem of the RAM size or disk space of our computer (64GB RAM), because when we set the number of bins to 1001002, it couldn't work, but if we set it to 100010001, it worked (the overall size of the mesh is the same)! Strangely, when we adjust the size of the mother volume of the structure, the maximum number photons at which the program can run smoothly varies a lot, even not in a monotonous pattern.

We noticed an error message:

.... G4ScoringMessenger::MeshBinCommand - G4ScoringBox ERROR: No current scene. Please create one.

Is the error related to the problem? How to correct it?

Any help is greatly appreciated.

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1 None: Re: command based scoring problem   (Huagang Yan - 13 Aug, 2017)
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