|Message: Setting particle source dimensions using gps||Not Logged In (login)|
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Hi G4 users, I am using an elliptical source of protons. It is a Gaussian distribution on the XY plane (x= 4cm; y=2.4cm ; +/- 3 sigma), with an energy spread of 380 keV and a FWHM beam divergence of 11.775 mrad. Macro code below: /gps/ene/type Gauss /gps/ene/mono 12.5 MeV /gps/ene/sigma 380 keV /gps/ang/sigma_r 0.6747 deg /gps/particle proton /gps/pos/type Beam /gps/pos/shape Ellipse /gps/pos/centre 0 0 20 cm /gps/pos/halfx 2 cm /gps/pos/halfy 1.2 cm /gps/direction 0 0 -1 How do I specify that the halfx of 2cm is the +/-3 sigma value? Thanks in advance.