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Forum: Documentation and Examples
Re: Question A Newbie's question: how is an event generated (Huagang Yan)
Re: None Re: A Newbie's question: how is an event generated (Tevfik Kaplanoglu)
Re: Question Re: A Newbie's question: how is an event generated (Huagang Yan)
Date: 18 Aug, 2016
From: Tevfik Kaplanoglu <Tevfik Kaplanoglu>

Hi Huagang,

Its not completely (and physically) same, when you send more than one
primary particles at one event, all the primary particles uses same
starting point. So, it means, for every "/run/beamOn" the number of
generated primary particles shares same starting variables. If the
radiation source area is a surface instead of a point (or if direction
is changing for every event), it can effects your statistics. But of
course, the selection of the method based on your project and
computational power. The aim of generating more than one particles for
every event is decreasing your computational effort a bit.

I'm attaching two pictures from exampleB1, the first picture shows an
event with 500 primary particles, and the second shows 500 events with 1
primary particles for per event.


On 18-08-2016 22:11, Huagang Yan wrote:
> *** Discussion title: Documentation and Examples
>
> Hi Tevfik,
>
> Thank you very much for your explanation. I still don't understand the
> usefulness of event.
>
> Perhaps I should ask the following question: what is the difference
> between a run that has 50 events each having only one primary track and
> a run that has 1 event having 50 primary tracks? Are they physically the
> same?
>
> Thanks a lot.
>
> -------------------------------------------------------------
> Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: 
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/docsexamples/647/1/1.html 


   Attachment:
     http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/08/18/16.07-33497-1event500particle.png

   Attachment:
     http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/08/18/16.07-68506-500event500particle.png

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1 Ok: Re: A Newbie's question: how is an event generated   (Huagang Yan - 19 Aug, 2016)
(_ None: Re: A Newbie's question: how is an event generated   (Tevfik Kaplanoglu - 20 Aug, 2016)
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