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Forum: Event and Track Management
Re: Warning Last Step missing in geant4.7.1p01 (Maria Lucia)
Date: 01 Dec, 2005
From: <vnivanch@mail.cern.ch>

On Mon, 28 Nov 2005, Maria Lucia wrote:

> *** Discussion title: Event and Track Management
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/eventtrackmanage/419"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Dear G4 Users,
> 
> I'm running the same event (140 keV gamma) by g4.7.0 and g4.7.1p01. In
> the latter case, the KinE of the last step is not 0 as one should expect
> from the photoelectric effect, as actually is in the former case.
> 
> Any ideas?
> 
> Thank you in advance
> 
> MLucia
> 
> Step informations follow:
> 
> >>>>> G4.7.0
> 
> *********************************************************************************************************
> * G4Track Information:   Particle = gamma,   Track ID = 1,   Parent ID = 0
> *********************************************************************************************************
> 
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>     0    -46.3     35.3    -67.5      0.14        0        0         0    Mammella initStep
>     1    -45.6     35.7    -28.1      0.14        0     39.4      39.4 av_3_impr_1_hexagon_pv_1040 Transportation
>     2    -45.2     35.9     -3.1      0.14        0       25      64.4 av_4_impr_321_EpoxyElement_log_pv_1 Transportation
>     3    -45.2     35.9       -3      0.14        0      0.1      64.5 EpoxyMatrix Transportation
>     4    -45.2     35.9     -2.9      0.14        0      0.1      64.6 av_4_impr_321_ScintiCrystal_pv_0 Transportation
>     5    -45.2     35.9     -1.7     0.112        0      1.2      65.8 av_4_impr_321_ScintiCrystal_pv_0 compt
>     6    -45.1     35.9    -1.69     0.112        0    0.114      65.9 av_4_impr_321_EpoxyElement_log_pv_1 Transportation
>     7      -45       36    -1.68     0.112        0    0.108        66 av_4_impr_404_EpoxyElement_log_pv_1 Transportation
>     8    -44.9       36    -1.68     0.112        0    0.108      66.1 av_4_impr_404_ScintiCrystal_pv_0 Transportation
>     9    -43.9     36.4    -1.61     0.112        0     1.08      67.2 av_4_impr_404_EpoxyElement_log_pv_1 Transportation
>    10    -43.8     36.5    -1.61     0.112        0    0.108      67.3 av_4_impr_487_EpoxyElement_log_pv_1 Transportation
>    11    -43.7     36.5     -1.6     0.112        0    0.108      67.4 av_4_impr_487_ScintiCrystal_pv_0 Transportation
>    12    -43.7     36.5     -1.6     0.112        0   0.0212      67.4 av_4_impr_487_EpoxyElement_log_pv_1 Transportation
>    13    -43.4     36.6    -1.58     0.112        0    0.271      67.7 av_4_impr_488_EpoxyElement_log_pv_1 Transportation
>    14    -43.2     36.7    -1.56     0.112        0    0.271        68 av_4_impr_488_ScintiCrystal_pv_0 Transportation
>    15    -42.7     36.9    -1.53         0   0.0332    0.501      68.5 av_4_impr_488_ScintiCrystal_pv_0 phot
> Track (trackID 1, parentID 0) is processed with stopping code 2
> ### pop requested out of 1624 stacked tracks.
> 
> >>>>> G4.7.1p01
> 
> *********************************************************************************************************
> * G4Track Information:   Particle = gamma,   Track ID = 1,   Parent ID = 0
> *********************************************************************************************************
> 
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>     0    -46.3     35.3    -67.5      0.14        0        0         0    Mammella initStep
>     1    -45.6     35.7    -28.1      0.14        0     39.4      39.4 av_3_impr_1_hexagon_pv_1040 Transportation
>     2    -45.2     35.9     -3.1      0.14        0       25      64.4 av_4_impr_321_EpoxyElement_log_pv_1 Transportation
>     3    -45.2     35.9       -3      0.14        0      0.1      64.5 EpoxyMatrix Transportation
>     4    -45.2     35.9     -2.9      0.14        0      0.1      64.6 av_4_impr_321_ScintiCrystal_pv_0 Transportation
>     5    -45.2     35.9    -1.71     0.112        0     1.19      65.8 av_4_impr_321_ScintiCrystal_pv_0 compt
>     6    -45.1     35.9     -1.7     0.112        0    0.114      65.9 av_4_impr_321_EpoxyElement_log_pv_1 Transportation
>     7      -45       36     -1.7     0.112        0    0.108        66 av_4_impr_404_EpoxyElement_log_pv_1 Transportation
>     8    -44.9       36    -1.69     0.112        0    0.108      66.1 av_4_impr_404_ScintiCrystal_pv_0 Transportation
>     9    -43.9     36.4    -1.63     0.112        0     1.08      67.2 av_4_impr_404_EpoxyElement_log_pv_1 Transportation
>    10    -43.8     36.5    -1.62     0.112        0    0.108      67.3 av_4_impr_487_EpoxyElement_log_pv_1 Transportation
>    11    -43.7     36.5    -1.61     0.112        0    0.108      67.4 av_4_impr_487_ScintiCrystal_pv_0 Transportation
>    12    -43.7     36.5    -1.61     0.112        0   0.0213      67.4 av_4_impr_487_EpoxyElement_log_pv_1 Transportation
>    13    -43.4     36.6     -1.6     0.112        0    0.271      67.7 av_4_impr_488_EpoxyElement_log_pv_1 Transportation
>    14    -43.2     36.7    -1.58     0.112        0    0.271        68 av_4_impr_488_ScintiCrystal_pv_0 Transportation
>    15    -42.7     36.9    -1.55     0.112   0.0332    0.508      68.5 av_4_impr_488_ScintiCrystal_pv_0 phot
> Track (trackID 1, parentID 0) is processed with stopping code 2
> ### pop requested out of 1624 stacked tracks.
> 
> 

Hello,

My understanding is following: at the end of the last step the  
photoelectric process kill gamma and create secondary electron. At this 
point gamma energy is not zero and cout of 7.1p01 is more correct - it 
shows the energy of the particle at the interaction vertex.

VI

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