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Question GPS bias command 

Forum: Event and Track Management
Date: 10 Sep, 2015
From: JungEun Elena Suh <JungEun Elena Suh>

Dear all

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/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,

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1 More: Re: GPS bias command   (JungEun Elena Suh - 10 Sep, 2015)
(_ Question: Re: GPS bias command   (JungEun Elena Suh - 11 Sep, 2015)
(_ None: Re: GPS bias command   (JungEun Elena Suh - 06 Oct, 2015)
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