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Forum: Fast Simulation, Transportation & Others
Re: Question geant4 transportation issue (Isabelle Fonteille)
Date: 04 May, 2010
From: Marc Verderi <Marc Verderi>

Hi Isabelle,

I would suggest you to post your message on the EM or hadronic physics 
forum.

Cheers,
Marc

Le 04/05/2010 10:55, Isabelle Fonteille a écrit :
> *** Discussion title: Fast Simulation, Transportation&  Others
>
> Dear all,
>
> I'm having issues with my geant4 simulation. I'm simulating the passage
> of high energy ions through two planes of silicium. I'm running the
> simulation with carbon genericIons. The kinetic energy of ions is 3TeV.
>
> I get a strange transportation process behaviour. The energy deposit of
> this process is always a multiple of a certain value (here 6.6). This
> behaviour disappear if I run the simulation at 300 GeV. What is the
> reason for such a behaviour ?
>
> My physics list is a standard one with only EM processes.
>
> Thank you very much.
>
> Here is the output of tracking/verbose
>
> *********************************************************************************************************
> *G4Track Information: Particle = C12[0.0], Track ID = 1, Parent ID = 0
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0     -109      267  1.3e+03     3e+06        0        0         0   world_phy initStep
>      1      -45     92.4      738     3e+06 3.17e-18      592       592 ChC_world_phy Transportation
>      2    -16.5       15      489     3e+06 1.41e-18      263       854   world_phy Transportation
>      3     -8.5    -6.87      418     3e+06 3.98e-19     74.4       929 SCDTopCover_phy Transportation
>      4    -8.38    -7.18      417     3e+06     19.9     1.05       930   world_phy Transportation
>      5    -5.68    -14.5      393     3e+06 1.34e-19       25       955 SCDTopContainer_phy Transportation
>      6    -5.64    -14.6      393     3e+06 2.14e-21      0.4       955   world_phy Transportation
>      7    -5.38    -15.4      391     3e+06 1.29e-20      2.4       958 SCDTopSensorFrame_phy Transportation
>      8    -5.24    -15.7      390     3e+06     6.57     1.25       959   world_phy Transportation
>      9    -4.97    -16.5      387     3e+06 1.35e-20     2.52       961 SCDTopLadder_phy Transportation
>     10    -4.84    -16.8      386     3e+06     13.2     1.23       963 SCDTopLadder_phy ionIoni
>     11    -4.79      -17      386     3e+06        0    0.444       963   world_phy Transportation
>     12    -4.78      -17      385     3e+06 5.94e-22    0.111       963 SCDTopThermalStrap_phy Transportation
>     13    -4.66    -17.3      384     3e+06     6.64     1.05       964   world_phy Transportation
>     14   -0.614    -28.3      349     3e+06    2e-19     37.4     1e+03 SCDBottomSensor_phys803 Transportation
>     15   -0.571    -28.4      349     3e+06     13.3      0.4     1e+03   world_phy Transportation
>     16   -0.311    -29.1      346     3e+06 1.29e-20      2.4     1e+03 SCDBottomSensorFrame_phy Transportation
>     17   -0.305    -29.2      346     3e+06        0   0.0552     1e+03 SCDBottomSensorFrame_phy ionIoni
>     18   -0.176    -29.5      345     3e+06        0     1.19  1.01e+03   world_phy Transportation
>     19   0.0934    -30.2      343     3e+06 1.33e-20     2.49  1.01e+03 SCDBottomLadder_phy Transportation
>     20    0.246    -30.6      341     3e+06        0     1.41  1.01e+03 SCDBottomLadder_phy ionIoni
>     21    0.281    -30.7      341     3e+06        0    0.326  1.01e+03   world_phy Transportation
>     22     0.29    -30.8      341     3e+06 4.32e-22   0.0806  1.01e+03 SCDBottomThermalStrap_phy Transportation
>     23    0.363      -31      340     3e+06     26.6    0.677  1.01e+03 SCDBottomThermalStrap_phy ionIoni
>     24    0.518    -31.4      339     3e+06     26.5     1.43  1.01e+03   world_phy Transportation
>     25     1.66    -34.5      329     3e+06 5.64e-20     10.5  1.02e+03 SCDBottomCover_phy Transportation
>     26      1.7    -34.6      329     3e+06        0    0.416  1.02e+03 SCDBottomCover_phy ionIoni
>     27     1.71    -34.6      329     3e+06        0    0.111  1.02e+03   world_phy Transportation
>     28      187     -540 -1.3e+03     3e+06 9.19e-18 1.72e+03  2.74e+03  OutOfWorld Transportation
>
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 2,   Parent ID = 1
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0    -4.84    -16.8      386      7.43        0        0         0 SCDTopLadder_phy initStep
>      1    -4.95      -17      386      7.29    0.144    0.455     0.455   world_phy Transportation
>      2    -4.98      -17      385      7.29 1.28e-23    0.117     0.572 SCDTopThermalStrap_phy Transportation
>      3    -5.26    -17.4      384      6.96    0.332     1.13       1.7   world_phy Transportation
>      4      -21      -34      349      6.96 4.62e-21     42.3        44 SCDBottomSensor_phys2403 Transportation
>      5    -21.1    -34.2      349      6.84     0.12    0.455      44.4   world_phy Transportation
>      6    -22.7    -35.1      346      6.84  3.2e-22     2.94      47.3 SCDBottomSensorFrame_phy Transportation
>      7    -23.6    -35.6      345      6.54    0.296     1.54      48.9   world_phy Transportation
>      8    -25.5    -36.8      343      6.54 3.58e-22     3.29      52.2 SCDBottomLadder_phy Transportation
>      9    -26.9    -37.6      341      5.85    0.685     2.34      54.5   world_phy Transportation
>     10      -27    -37.7      341      5.85 1.01e-23   0.0941      54.6 SCDBottomThermalStrap_phy Transportation
>     11    -27.8    -38.8      339      3.49     2.36     2.61      57.2   world_phy Transportation
>     12    -32.5    -44.6      329      3.49 1.27e-21     12.5      69.7 SCDBottomCover_phy Transportation
>     13    -32.7    -44.9      329      3.27    0.218    0.645      70.3   world_phy Transportation
>     14     -618     -273 -1.3e+03      3.27 1.77e-19 1.75e+03  1.82e+03  OutOfWorld Transportation
>
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 3,   Parent ID = 1
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0   -0.305    -29.2      346      3.11        0        0         0 SCDBottomSensorFrame_phy initStep
>      1    0.248    -29.4      346      2.96    0.144    0.855     0.855 SCDBottomSensorFrame_phy eBrem
>      2    0.716    -29.7      345      2.83    0.133    0.781      1.64   world_phy Transportation
>      3     1.88    -30.9      343      2.83  2.9e-22     2.89      4.53 SCDBottomLadder_phy Transportation
>      4     2.25    -31.7      342      2.41     0.42     1.48         6 SCDBottomLadder_phy msc
>      5     2.26    -32.1      341      2.26    0.148    0.653      6.66   world_phy Transportation
>      6     2.27    -32.1      341      2.26 8.25e-24   0.0835      6.74 SCDBottomThermalStrap_phy Transportation
>      7     2.33    -32.2      341      2.17   0.0886     0.21      6.95 SCDBottomThermalStrap_phy msc
>      8     2.39    -32.2      341      2.11   0.0645     0.21      7.16 SCDBottomThermalStrap_phy msc
>      9     2.44    -32.3      340      2.05   0.0552     0.21      7.37 SCDBottomThermalStrap_phy msc
>     10     2.49    -32.3      340         2   0.0542     0.21      7.58 SCDBottomThermalStrap_phy msc
>     11     2.53    -32.4      340      1.92   0.0806     0.21      7.79 SCDBottomThermalStrap_phy msc
>     12     2.56    -32.4      340      1.86     0.06     0.21         8 SCDBottomThermalStrap_phy msc
>     13     2.49    -32.6      340      1.79   0.0731     0.21      8.21 SCDBottomThermalStrap_phy msc
>     14     2.39    -32.6      340      1.72   0.0629     0.21      8.42 SCDBottomThermalStrap_phy msc
>     15     2.35    -32.7      339      1.66   0.0583     0.21      8.63 SCDBottomThermalStrap_phy msc
>     16     2.34    -32.9      339      1.59   0.0782     0.21      8.84 SCDBottomThermalStrap_phy msc
>     17     2.35      -33      339      1.51   0.0777     0.21      9.05 SCDBottomThermalStrap_phy msc
>     18     2.35    -33.1      339      1.48   0.0254   0.0795      9.13   world_phy Transportation
>     19     4.44    -39.6      329      1.48 1.18e-21     12.1      21.2 SCDBottomCover_phy Transportation
>     20     4.46    -39.7      329      1.43   0.0491    0.103      21.4 SCDBottomCover_phy msc
>     21     4.48    -39.7      329       1.4   0.0351    0.103      21.5 SCDBottomCover_phy msc
>     22     4.45    -39.7      329      1.37   0.0308    0.103      21.6 SCDBottomCover_phy msc
>     23     4.43    -39.7      329      1.31   0.0592    0.103      21.7 SCDBottomCover_phy msc
>     24     4.39    -39.7      329      1.26   0.0437    0.103      21.8 SCDBottomCover_phy msc
>     25     4.37    -39.7      329      1.25   0.0186   0.0613      21.8   world_phy Transportation
>     26     -468      480 -1.3e+03      1.25 1.73e-19 1.77e+03   1.8e+03  OutOfWorld Transportation
>
> *********************************************************************************************************
> * G4Track Information:   Particle = gamma,   Track ID = 7,   Parent ID = 3
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0    0.248    -29.4      346   0.00715        0        0         0 SCDBottomSensorFrame_phy initStep
>      1    0.705    -29.7      345   0.00715        0    0.774     0.774   world_phy Transportation
>      2     2.71    -31.1      343   0.00715        0      3.4      4.18 SCDBottomLadder_phy Transportation
>      3     2.81    -31.2      343         0  0.00404    0.161      4.34 SCDBottomLadder_phy phot
>
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 8,   Parent ID = 7
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0     2.81    -31.2      343    0.0031        0        0         0 SCDBottomLadder_phy initStep
>      1     2.81    -31.2      343         0   0.0031 0.000241  0.000241 SCDBottomLadder_phy eIoni
>
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 4,   Parent ID = 1
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0    0.246    -30.6      341       1.8        0        0         0 SCDBottomLadder_phy initStep
>      1    0.191    -30.6      341      1.72   0.0818    0.334     0.334   world_phy Transportation
>      2    0.183    -30.5      341      1.72 8.03e-24   0.0821     0.417 SCDBottomThermalStrap_phy Transportation
>      3     0.18    -30.5      341      1.68   0.0352     0.13     0.546 SCDBottomThermalStrap_phy msc
>      4    0.175    -30.4      341      1.65   0.0382     0.13     0.676 SCDBottomThermalStrap_phy msc
>      5     0.21    -30.3      341      1.61    0.034     0.13     0.806 SCDBottomThermalStrap_phy msc
>      6    0.205    -30.2      341      1.57   0.0385     0.13     0.936 SCDBottomThermalStrap_phy msc
>      7    0.205    -30.2      340      1.54   0.0352     0.13      1.07 SCDBottomThermalStrap_phy msc
>      8    0.174    -30.1      340       1.5   0.0378     0.13       1.2 SCDBottomThermalStrap_phy msc
>      9    0.139      -30      340      1.45   0.0521     0.13      1.33 SCDBottomThermalStrap_phy msc
>     10   0.0618      -30      340      1.41   0.0339     0.13      1.45 SCDBottomThermalStrap_phy msc
>     11  -0.0176      -30      340      1.35   0.0599    0.144       1.6 SCDBottomThermalStrap_phy msc
>     12  -0.0541    -29.9      340      1.22    0.137    0.161      1.76 SCDBottomThermalStrap_phy msc
>     13  -0.0973    -29.8      340      1.15   0.0687    0.184      1.94 SCDBottomThermalStrap_phy msc
>     14   -0.198    -29.8      340       1.1   0.0533    0.184      2.13 SCDBottomThermalStrap_phy msc
>     15   -0.277    -29.9      339      1.04   0.0519    0.184      2.31 SCDBottomThermalStrap_phy msc
>     16    -0.43    -29.9      339     0.968   0.0755    0.184       2.5 SCDBottomThermalStrap_phy msc
>     17   -0.564      -30      339     0.768    0.199    0.184      2.68 SCDBottomThermalStrap_phy msc
>     18    -0.68    -30.1      339     0.714   0.0544    0.184      2.87 SCDBottomThermalStrap_phy msc
>     19   -0.774      -30      339     0.649   0.0655    0.184      3.05 SCDBottomThermalStrap_phy msc
>     20   -0.819    -29.9      339     0.594   0.0542    0.184      3.23 SCDBottomThermalStrap_phy msc
>     21   -0.863    -29.7      339     0.466    0.129    0.184      3.42 SCDBottomThermalStrap_phy msc
>     22   -0.859    -29.7      339     0.361    0.105    0.149      3.57   world_phy Transportation
>     23   -0.859    -29.7      339     0.361        0        0      3.57 SCDBottomThermalStrap_phy Transportation
>     24   -0.864    -29.6      339     0.355   0.0064   0.0118      3.58 SCDBottomThermalStrap_phy msc
>     25   -0.865    -29.6      339     0.354 0.000422  0.00194      3.58   world_phy Transportation
>     26    -45.9     55.8      329     0.354 1.19e-20     97.1       101 SCDBottomCover_phy Transportation
>     27    -45.9     55.8      329     0.349  0.00469   0.0115       101 SCDBottomCover_phy msc
>     28    -45.9     55.8      329     0.342  0.00789   0.0115       101 SCDBottomCover_phy msc
>     29    -45.9     55.8      329     0.337   0.0042   0.0115       101 SCDBottomCover_phy msc
>     30    -45.9     55.8      329     0.326   0.0114   0.0115       101 SCDBottomCover_phy msc
>     31    -45.9     55.8      329     0.323  0.00337   0.0115       101 SCDBottomCover_phy msc
>     32    -45.9     55.8      329     0.318  0.00456   0.0115       101 SCDBottomCover_phy msc
>     33    -45.9     55.9      329     0.315  0.00306   0.0115       101 SCDBottomCover_phy msc
>     34    -45.9     55.9      329     0.311  0.00358   0.0115       101 SCDBottomCover_phy msc
>     35    -45.9     55.9      329     0.307  0.00385   0.0115       101 SCDBottomCover_phy msc
>     36    -45.9     55.9      329     0.302  0.00528   0.0115       101 SCDBottomCover_phy msc
>     37      -46     55.9      329     0.299  0.00324   0.0115       101 SCDBottomCover_phy msc
>     38      -46     55.9      329     0.294  0.00484   0.0115       101 SCDBottomCover_phy msc
>     39      -46     55.9      329     0.289  0.00498   0.0115       101 SCDBottomCover_phy msc
>     40      -46     55.9      329     0.285   0.0046   0.0115       101 SCDBottomCover_phy msc
>     41      -46     55.9      329      0.14    0.145   0.0115       101 SCDBottomCover_phy msc
>     42      -46     55.9      329     0.128   0.0121   0.0115       101 SCDBottomCover_phy msc
>     43      -46     55.9      329     0.111    0.017   0.0115       101 SCDBottomCover_phy msc
>     44      -46     55.9      329     0.105  0.00628   0.0115       101 SCDBottomCover_phy msc
>     45      -46     55.9      329    0.0962  0.00836   0.0115       101 SCDBottomCover_phy msc
>     46      -46     55.9      329    0.0898  0.00636   0.0115       101 SCDBottomCover_phy msc
>     47      -46     55.9      329    0.0798     0.01   0.0115       101 SCDBottomCover_phy msc
>     48      -46     55.9      329      0.07  0.00978   0.0115       101 SCDBottomCover_phy msc
>     49      -46     55.9      329    0.0516   0.0184   0.0115       101 SCDBottomCover_phy msc
>     50      -46     55.9      329    0.0274   0.0242   0.0115       101 SCDBottomCover_phy msc
>     51      -46     55.9      329         0   0.0274  0.00758       101 SCDBottomCover_phy eIoni
>
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 5,   Parent ID = 1
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0    0.363      -31      340      2.88        0        0         0 SCDBottomThermalStrap_phy initStep
>      1    0.527    -30.9      340      2.79   0.0956    0.379     0.379 SCDBottomThermalStrap_phy msc
>      2    0.616    -30.8      340      2.66    0.123    0.379     0.758 SCDBottomThermalStrap_phy msc
>      3    0.785    -30.7      339      2.55    0.109    0.379      1.14 SCDBottomThermalStrap_phy msc
>      4     0.94      -31      339       2.4    0.156    0.379      1.52 SCDBottomThermalStrap_phy msc
>      5     1.13    -31.3      339      2.29    0.106    0.379      1.89 SCDBottomThermalStrap_phy msc
>      6     1.34    -31.6      339      2.15    0.143    0.379      2.27 SCDBottomThermalStrap_phy msc
>      7     1.66    -31.8      339      2.03    0.121    0.379      2.65 SCDBottomThermalStrap_phy msc
>      8     1.82    -31.9      339      1.95   0.0794    0.185      2.84   world_phy Transportation
>      9       14    -38.7      329      1.95 1.68e-21     17.2        20 SCDBottomCover_phy Transportation
>     10     14.1    -38.7      329       1.9   0.0506     0.16      20.2 SCDBottomCover_phy msc
>     11     14.2    -38.8      329      1.85   0.0465     0.16      20.3 SCDBottomCover_phy msc
>     12     14.3    -38.8      329       1.8   0.0544     0.16      20.5 SCDBottomCover_phy msc
>     13     14.4    -38.7      329      1.75   0.0464     0.16      20.6 SCDBottomCover_phy msc
>     14     14.5    -38.7      329       1.7   0.0525    0.157      20.8   world_phy Transportation
>     15  1.3e+03      236     -727       1.7 1.65e-19 1.69e+03  1.71e+03  OutOfWorld Transportation
>
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 6,   Parent ID = 1
> *********************************************************************************************************
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>      0      1.7    -34.6      329      2.89        0        0         0 SCDBottomCover_phy initStep
>      1     1.77    -34.7      329      2.85    0.039    0.159     0.159   world_phy Transportation
>      2      908 -1.3e+03 -1.21e+03      2.85  2.2e-19 2.19e+03  2.19e+03  OutOfWorld Transportation
>
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