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Question isotropic flux from a square source 

Forum: Particles
Date: 19 Jul, 2011
From: Athreya Shankar <Athreya Shankar>

hello,

I am trying to obtain an isotropic flux from a 15 mm x 15 mm square source. This source is to be placed on the YZ plane, and protons are to be emitted isotropically, only along the positive x-axis direction.

I tried the following commands:

/gps/particle proton # for proton incidence

/gps/energy 40 MeV

/gps/pos/type Plane

/gps/pos/shape Square

/gps/pos/halfz 15 mm

/gps/pos/halfy 15 mm

/gps/pos/centre -26.16 0. 0. mm

/gps/ang/type cos

/run/beamOn 10000

But the above code did not give the desired result. Then I tried

/gps/particle proton # for proton incidence

/gps/energy 40 MeV

/gps/pos/type Plane

/gps/pos/shape Square

/gps/pos/halfx 15 mm

/gps/pos/halfy 15 mm

/gps/pos/rot1 0. 0. 1.

/gps/pos/centre -26.16 0. 0. mm

/gps/ang/type cos

/run/beamOn 10000

Now, I got the desired result. But, shouldn't the first method work as well?

Also, I read that specifying iso for an extended source would not make the source isotropic. Is there a way to make the source emit particles isotropically in the whole 4 pi solid angle?

Thanks in advance, Athreya

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1 None: Re: isotropic flux from a square source   (michel maire - 20 Jul, 2011)
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