Problem 42

Summary: the ajustment of kRadTolerance
Product: Geant4 Reporter: liuht
Component: trackingAssignee: Katsuya.Amako
Status: RESOLVED WORKSFORME    
Severity: normal    
Priority: P2    
Version: 1.0   
Hardware: PC   
OS: Linux   

Description liuht 1999-12-12 04:17:33 CET 
I am working on AMS analysis, I use Geant4 to simulate the
 cosmic ray behaviar around the earth. I find sometimes it
can not find the border correctly. It will throw out a
G4exception. I just change kRadTolerance from 1e-9mm to 1mm.
and it fixed the problem. I just wonder if that will have
infuence on the result?
Comment 1 John Apostolakis 2000-01-28 07:34:59 CET 
The concept of the tolerance is the following: it is a distance which is
too small to matter for the accuracy of the physics or detector that you
interested in studying,  but much larger than the numerical accuracy of
the simulation.

If your detector has features of the size of millimiter or centimeter, then
it is risky to have tolerance of 1 mm.  (Put the tolerance to 1e-2 eg).
Else it is ok.

This is not a problem report.