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Forum: Event and Track Management
Re: None How can I Restart a Stopped Track? (Tom Roberts)
Re: None Re: How can I Restart a Stopped Track? (Vladimir IVANTCHENKO )
Date: 09 Feb, 2006
From: Tom Roberts <Tom Roberts>

Yes,indeed, the electric field is dynamic: it is zero until most of the mu+ stop (or are quite low energy). Then after ~1/4 decay time the E field is rapidly ramped up to accelerate them out of the material.

I really want the full Geant4 tracking, energy loss, multiple scattering, etc. for tracking these, as I want the simulation to be as realistic as possible.

I'm thinking that my new Process should replace G4StepLimiter on this particle, and never actually stop it. My new Process should ensure the particle always has ~1/40 eV KE, so it can specify a step length of a micron or so, keeping the time interval of each step ~1 ns while waiting for the E field to come on. Whenever the particle's KE is too low, it would kick it in a random direction.

For my purposes, errors of a few eV and a few dozen microns are not important. That 1/40 eV is of course not arbitrary, and perhaps these random kicks are not really "errors" anyway. So I'm not terribly concerned how accurate the other physics processes are at such a low energy, just that they behave reasonably.

This way the particles never actually stop.

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1 None: Re: How can I Restart a Stopped Track?   (Vladimir IVANTCHENKO - 10 Feb, 2006)
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