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Forum: Hadronic Processes
Re: None First inelastic interaction point of hadronic processes (Soon Yung Jun)
Re: None Re: First inelastic interaction point of hadronic processes (michel maire)
Date: 10 Apr, 2007
From: Soon Yung Jun <Soon Yung Jun>

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Dear Michel,

The envisaged detector used for a trial fast hadronic shower model is 
the CMS
EM calorimeter (PbWO4) and Hadron Calorimeter (Brass).  The first envelope
is the EM of which thickness (22-23cm) is about 1 interaction length 
(22.4cm).
So I expected that around 1/3 of poins (i.e, e^(-1)) would be the 
minimum ionizing particle
in the EM calorimeter (i.e, non interaction poins which pass EM leaving 
only dE/dx energy loss),
but apparently almost of all poins meet the condition implemented in the 
code within the first 3cm
- the majority of population (~3/4) is follow the exponential drop 
within 3cm and the rest gives a
flat distribution up to 25cm.  I tested the code with and without 
tracking volume in front of the EM,
which gave a similar result.   The plot at the bottom right in the 
attached shows the distribution
of the first inelastic interaction point inside the first envelope using 
the code fragment.
Thanks for your comment.

Regards, ---Soon

michel maire wrote:
> *** Discussion title: Hadronic Processes
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/hadronprocess/676/2"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
>
> User Soon Yung Jun wrote:
>
>   
>>> To get the first inelastic interaction point of pions inside a G4Region 
>>> (an envelope for G4VFastSimulationModel), I tried the following code 
>>> segment;
>>>
>>> G4StepPoint* postStep = fastTrack.GetPrimaryTrack()->GetStep()->GetPostStepPoint();
>>> G4String procName = postStep->GetProcessDefinedStep()->GetProcessName();  
>>>
>>> if(procName == "PionPlusInelastic" || procName == "PionMinusInelastic") {
>>>   isFirst = true;
>>> }
>>>
>>> The resultant total step length (x) after pions enter a detector volume
>>> (an envelope) by this method gave much shorter distance than expected - 
>>> I expect that the first inelatic interaction point would follow 
>>> exp^{-x/lambda0} where lambda0 is the interaction length of the detector.  
>>> What am I missing?  Thanks for your help.
>>>
>>>       
>
>  1 - Is the envelope the first volume ? or the pion has already
>  travelled in previous volume(s) ?
>
>  2 - Is the size of the envelope big enough compared to lambda0 ? 
>  otherwise the result is biased by non interactive pions.
>
>                     Michel Maire
>
>  examples/extended/electromagnetic/TestEm14 (and Em13) does this
>  computation in case of electromagnetic interactions. See Readme    
>
>   


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end
%%EOF

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1 None: Re: First inelastic interaction point of hadronic processes   (michel maire - 12 Apr, 2007)
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