|Message: Re: Isotropic flux with Planetocosmics: GPS comands not working properly||Not Logged In (login)|
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Hi Michael, I used similar commands many times and they worked for me. Are you sure you placed Earth in the same center? Best regards, Sveta On 7/12/16 4:36 AM, Michael Milde wrote: > > *** Discussion title: Space Applications > > Hello everyone, > > I need to generate an isotropic particle flux on Earth´s surface through > the Planetocosmics framework. For the source geometry I use the > following Geant4 /gps commands: > > /gps/pos/type Surface > > /gps/pos/shape Sphere > > /gps/pos/centre 0. 0. 0. km > > /gps/pos/radius 7870 km > > /gps/ang/type cos > > /gps/ang/mintheta 0.00 deg > > /gps/ang/maxtheta 90.00 deg > > The expected flux from the starting positions on the source sphere, as > I´ve read in many threads here, should have a cos modulation centred > around the perpendicular direction at the source sphere (and thus > directed to the Earth's centre, since my source sphere is centred in 0 0 > 0 in a planetocentric coordinate frame). > > Now my problem: if I run the simulation, the particles are correctly > generated from the source sphere centred around the Earth, but their > direction is centred towards a point somewhere in space, and not at the > Earth's centre, as I would like. In the attachments you can find > pictures (1-2) of the tracks. In picture 3 and 4 you can see the result > if I set /gps/ang/mintheta 0.00 deg and /gps/ang/maxtheta 0.00 deg, so > just the (expected) "zenith" direction is allowed. Here, all the tracks > are pointed towards some point in space. > > I already tried to add commands like /gps/ang/surfnorm, > /gps/ang/user_coor, but nothing seems to help. Also the circle source > has the same behaviour. > > Did someone encounter this or a similar problem already and was able to > solve it? Do you have some advices? > > Thanks! Best Regards, > > Michael > > Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/12/03.34-42312-PCSimulationSphere1.png > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/12/03.34-7371-PCSimulationSphere2.png > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/12/03.34-56069-PCSimulationSphere3.png > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/12/03.34-7442-PCSimulationSphere4.png > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/space_app/123.html >
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