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## Re: Different energy loss in two method

Forum: Analysis
Re: Different energy loss in two method (Kavita Lalwani)
Re: Re: Different energy loss in two method (Kavita Lalwani)
Re: Re: Different energy loss in two method (Kavita Lalwani)
Re: Re: Different energy loss in two method (Tsukasa Aso)
Re: Re: Different energy loss in two method (Kavita Lalwani)
Date: 05 Jun, 2012
From: Tsukasa Aso <Tsukasa Aso>

 ```Hi, > > 1) Is above method is correct to calculate the entry and exit angles at > any detector boundary. You should use G4StepPoint::GetMomentumDirection( ) of pre-step and post-step. Do not use G4Track::GetMomentumDirection( ) in this case. I think following questions are byeond a scope of Geant4 forum, or it is rather ambiguous to understand these results. Geant4 calculates these quantities with respect to physics processes, and those are strongly follow your simulated conditions, i.e. geometry, physics list etc. Please check your simulation condition again. I suggest that it may be good to confirm these behavior step by step. For example by simulating more simple case such as simulating without water phantom, with only simple Rohacell plate geometry, etc. Tsukasa > 2) I have calculated entry and exit angles for two glue material > Rohacell & Mylar (density & thickness are defined below) in all four > fiber trackers. > > For Rohacell {C(5)H(8)O(2)}: density: 0.032g/cm^3, thickness : 0.2 mm > For Mylar {C(10)H(8)O(4)}: 1.4 g/cm^3, thickness: 0.15mm > > After seeing output, I found that Proton Inelastic interactions are > large in water, calorimeter etc in case of Mylar layer as compare to > Rohacell. Why it is so? and > > 3) why the RMS of angles of Roha layers 3 & 4 are large and deposited > energy are less as compare to Mylar 3 & 4. (attached plots for 5k). > > I would be thankful if any G4expert can give explanation for the above > queries. > > Thanks & Regards > > Kavita Lalwani > > Research Associate, Department of Physics & AstroPhysics, University of > Delhi > > Attachment: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/06/04/03.06-99106-comprohamylar.pdf > ```

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