Bremsstrahlung by an electron beam

I am interested in the bremsstrahlung generated by an electron beam. However I would like to kill any electrons or positrons with energies below the beam energy as, in reality, they are removed by a magnet. How can this be done?

Define a thin region with a material of low density in which you set the transport thresholds for electrons and positrons to a value just below the beam energy (card EMFCUT). Electrons and positrons would then be stopped in that region with the energy entirely deposited at the stopping point. The region should be thin enough (and of low-density material) such that other particles interact as little as possible in it. Note, that the region cannot be vacuum. Electron transport cutoffs are not allowed in vacuum since the energy deposition (at the stopping point) would be unphysical.

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