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Forum: (Graphical) User Interfaces
Re: Question How to set ApplyCut to ON?
Date: 19 Dec, 2005
From: <vnivanch@mail.cern.ch>

On Mon, 19 Dec 2005 zhangqm@ihep.ac.cn wrote:

> *** Discussion title: (Graphical) User Interfaces
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/userinterface/36"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> In the Geant4 User's Guide, The following content is mentioned:
> .......................................................................
> ApplyCut is OFF: do nothing. All the secondaries are stacked (and then
> tracked later on), regardless of their initial energy. The Geant4 kernel
> respects the best that the physics can do, but neglects the overall
> coherence and the efficiency. Energy conservation is respected as far as
> the processes know how to handle correctly the particles they produced!
> ApplyCut in ON: the TrackingManager checks the range of each secondary
> against the production threshold and against the safety. The particle is
> stacked if range > min(cut,safety).
> .......................................................................
> In the passage in this forum, the following content is mentioned:
> .....................................................................
> The ApplyCut is Off by default, and needs to be On with
> /run/particle/applyCuts.
> ......................................................................
> 
> but I can't find the interface method in run.
> 

Hello,

Thank you for pointing out to the problem in documentation - this part was 
not renewed at time.

The current situation is following:
- in G4 kernel cuts are applied only for gamma, e+, and e-
- processes with infrared divergence never produce secondaries below cuts 
but are using production thresholds (see Physics Reference Manual), so "ApplyCuts" 
option is not effective
- in contrary, processes, which can produce low energy gamma, e+, e- with 
relatively small cross section, may not use production thresholds and will 
produce low energy secondaries. For secondaries from this processes 
"ApplyCuts" option will be effective.
 
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