GPS source macro with specific distance between the particles

Hello,
I have this gps macro file and I want to make some changes and I do not know how.
I would like to have a uniform beam with 65 mm radius. And in that to have to photons with distance between them from 100 microns until 2 cm. So the distance between them to vary from between these two values for each event: 100 microns < d < 2 cm.
How can I define this distance etc?
Can I also have square beam?
Thank you very much in advance!
Whatever help is very much appreciated.

/gps/particle gamma
/gps/pos/type Point 
/gps/pos/centre 11.075 7.64 -30 mm 
/gps/ene/mono 1000 GeV 
/gps/direction 0 0 1 


/gps/source/add 1
/gps/particle gamma
/gps/pos/type Point 
/gps/pos/centre 11.075 7.24 -30 mm 
/gps/ene/mono 1000 GeV 
/gps/direction 0 0 1 
/gps/source/multiplevertex 1

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