|Message: GPS bias command||Not Logged In (login)|
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Dear all Hello I have a question about GPS command. I generated isotropic beam initiated from spherical surface. But I want to shoot primary particle only from half of the spherical surface. I found some comments that I should use biasing. I think that there is no command to make hemisphere. First I put commands as below in my macro to generate spherical one. /gps/particle/ion /gps/ion . . /gps/ene/type Mono /gps/ene/mono ~ GeV /gps/pos/type Surface /gps/pos/shape Sphere /gps/pos/centre 0 0 0 cm /gps pos/radius 1 m /gps/ang/type iso /gps/ang/minphi 0 deg /gps/ang/maxphi 360 deg /gps/ang/mintheta 0 deg /gps/ang/maxtheta 30 deg And now I want to use half of this spherical surface. (For me it'll be -y part.) Then it seems that I should add /gps/hist/type biasy /gps/hist/point 0 1 /gps/hist/point 2 3 … Of course here 0 1 and 2 3 are arbitrary numbers. It seems I should put some numbers. However I don't know and I can't find what do those numbers mean. What is the first number and what is the second number? What is the unit or they don't have unit? Or where can I find some instructions? Thank you! and have a nice day :) Best wishes, JungEun.
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