|Message: Tracking philosophy||Not Logged In (login)|
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Dear Geant4 experts, In the tracking part of section 5.1.1 in the User Guide V6.2, the algorithm to handle one step is given. I think some points sholud be clarified. Item 3: The geometry navigator calculates the Safety. If the minimum physical-step-length from all processses is shorter than Safety, it will be selected as the next step length. In this case, no geometrical calculations will be performed.|| It's easy to be understood logically. But for next item Item 4: If the mimimum physical-step-length is longer than Safety, the distance to the next boundary is re-calculated.|| According to the definition, Safety is the distance to the next boundary. Why Safety is re-calculated? How? Is the re-calculated Safety is different from the previous one? Why? I notice the difference of expresions between the current documentation and previous ones (say V5.0). In the old documentation, Item 4 says if the minimum physical-step-length is longer than Safety, the current point of the particle is "backed up" to its previous step point when the previous step is not limited by geometrical boundary, then the Safety is re-calculated. Does it mean the previous step will be altered by this action? At least to me, it's hard to understand the concept. One more question. In Geant4, transportantion is regarded as a physical process. What is the physical-step-length it produces? Is it the length from the current point to the world boundary? Thank you very much. Huaimin Liu IHEP, Beijing
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