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Forum: Hadronic Processes
Re: None 1-2 MeV protons are NOT scattered, 3 and more MeV are scattered (Gorelick Sergey)
Re: None Re: 1-2 MeV protons are NOT scattered, 3 and more MeV are scattered (Vladimir IVANTCHENKO )
Date: 24 Oct, 2006
From: Gorelick Sergey <Gorelick Sergey>

Hello Vladimir,

thank you for your reply. I was experimenting with the Cut Values, and it does seem to improve the behavior of the protons in foils. However, I am afraid I don't exactly understand the concept of the "cut values" or the philosophy behind them. The official CERN's G4 manual states that

"To avoid infrared divergence, some electromagnetic processes require a threshold below which no secondary will be generated. Because of this requirement, gammas, electrons and positrons require production thresholds which the user should define. This threshold should be defined as a distance, or range cut-off, which is internally converted to an energy for individual materials." and "Each particle has a suggested cut in range (which is converted to energy for all materials)"

The explanations are somewhat unclear. I cannot figure out how (and why) reducing the Cut Values can "improve" the simulation, or make the motion of the particles in the media more real. I did not notice big difference in time needed to calculate the whole simulations even when I used 10 nm cut value.

Thank you.

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1 None: Re: 1-2 MeV protons are NOT scattered, 3 and more MeV are scattered   (Vladimir IVANTCHENKO - 24 Oct, 2006)
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