|Message: Re: GPS Point Source problem||Not Logged In (login)|
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Okay, now that I understand a bit better --- I have actually done something similar.
The way I did it was to determine the angular distribution required by the radius and the starting distance from the detector and then set the momentum distribution accordingly using min/max theta/phi:
/gps/position 0 0 100 cm /gps/type Point
/gps/angtype iso /gps/mintheta 0 deg /gps/maxtheta 10 deg
/gps/minphi 0 deg /gps/maxphi 360 deg
This will fire into a cone that is determined by the theta/phi values, where theta is constraining the radius.
Perhaps one of the GPS maintainers has a more direct solution.
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