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Forum: Run Management
Re: Question Having two run managers co-existing for full-simulation and quick reconstruction (Chris Tunnell)
Date: 10 Feb, 2006
From: Makoto Asai <Makoto Asai>

G4RunManagerKernel must be a singleton. Of course, since Geant4 is a
toolkit, you can utilize pieces to build up your own application with
two "run managers", but I'm not sure Geant4 as a whole works in this way.

Actually, I don't see any particular reason to have two run managers in
your case.

1) Given "optical photon" you want to trace separately is treated as a
different kind of particle rather than gamma, and thus optical photon
has its own process manager, you won't be bothered by other processes
assigned to other particle types. Thus, you do not have to have two
physics list.

2) With "fast simulation manager" you can alternate your geometry setup
"on the fly". Thus, you can use a simplified geometry dedicated for
optical photon.

3) You may want to utilise the stacking mechanism to suspend all the
optical photon tracks until all other tracks has been traced.

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