[Gate-users] variance reduction techniques: narrow radiosurgery fields

[G Tom]

hi all

I am simulating a linac with very narrow radiosurgery collimattion below
the jaws.
In my setup I simulate a 6MV linac using phase space files stored just
above the jaws; which are open to 5cm x 5cm field size.

I have below the jaws,  a narrow radiosurgery tungsten collimator with an
opening of 10mm. I want to improve efficiency by tracking only particles
that have a chance of reaching my scoring region below the narrow
collimator.

What are the commands to enable variance reduction so that only track
particles that will go towards the narrow opening and my scoring regions
below ?


Thanks
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