|Message: Re: 'non-continous' electron trajectories||Not Logged In (login)|
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Dear Dragos, What you are seeing is an artifact of the tracking process in Geant4. The field propagation is calculated first, which gives you a curved trajectory when ‘smooth’ trajectories are chosen. At the end of a physics step, the correction for multiple scattering is applied - and this creates the kink which you observe. John =================================================== John Apostolakis, EP Department, CERN > On 18 Mar 2016, at 23:12, Dragos Constantin <firstname.lastname@example.org> wrote: > > > *** Discussion title: Fields: Magnetic and Otherwise > > Dear Colleagues, > > I have a very simple program where I have defined a local constant > magnetic field in a sub-volume. This volume is filled with air and I am > generating 8 MeV electrons such that they could spiral and eventually > they make it out of the magnetic volume. Most of the interaction points > look fine but for some steps the electron decides to perform a sudden > 'jump'. I have attached a screen capture to my message to see what I am > talking about. > > I have circled with black a secondary track which looks fine, and I have > used red to circle some of these jumps which I think are not physical. > What is going on here? > > All I can tell is that there are no auxiliary points along the straight > line where the jump is performed. > > Thanks, > > Dragos > > Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/03/18/15.10-42019-electron_trajectories.png > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/emfields/240.html
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