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Sad Energy deposition errors ? 

Keywords: Energy deposition error?
Forum: Event and Track Management
Date: 05 Sep, 2007
From: Yuxin Feng <fengyx@ufl.edu>

Dear All,

When I calculated the deposited energy of electron in a detector, I found the deposited energy could be greater than the kinetic energy of initial electron. To test it you may run an example of N03 with

/control/verbose 2

/control/saveHistory

/run/verbose 2

/event/verbose 0

/tracking/verbose 1

/gun/particle e-

/gun/energy 0.300 MeV

/run/beamOn 10

you will find

---> Begin of event: 0

*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0     -9 cm      0 fm      0 fm    300 keV     0 eV      0 fm      0 fm        World    initStep
    1   -7.5 cm      0 fm      0 fm    300 keV     0 eV    1.5 cm    1.5 cm        World  Transportation
    2   -7.4 cm      0 fm      0 fm    300 keV     0 eV      1 mm    1.6 cm        Layer  Transportation
    3   -7.4 cm    630 nm   -807 nm    294 keV  5.67 keV  2.91 um    1.6 cm         Lead         msc
    4   -7.4 cm   2.94 um  -1.59 um    283 keV  11.6 keV  2.91 um    1.6 cm         Lead         msc
    5   -7.4 cm   5.41 um   -467 nm    271 keV  11.6 keV  2.91 um    1.6 cm         Lead         msc
    6   -7.4 cm   7.67 um  -1.62 um    261 keV   9.8 keV  2.91 um    1.6 cm         Lead         msc
    7   -7.4 cm   9.95 um  -3.05 um    255 keV     6 keV  2.91 um    1.6 cm         Lead         msc
    8   -7.4 cm   11.4 um  -4.95 um    247 keV  8.47 keV  2.91 um    1.6 cm         Lead         msc
    9   -7.4 cm   9.75 um  -6.45 um    238 keV  8.81 keV  2.91 um    1.6 cm         Lead         msc
   10   -7.4 cm   9.62 um  -8.93 um    223 keV  14.8 keV  2.91 um    1.6 cm         Lead         msc
   11   -7.4 cm   12.2 um  -9.56 um    213 keV  9.85 keV  2.91 um    1.6 cm         Lead         msc
   12   -7.4 cm   13.2 um  -11.5 um    201 keV  12.4 keV  2.91 um    1.6 cm         Lead         msc
   13   -7.4 cm   12.8 um  -14.1 um    191 keV  9.85 keV  2.91 um    1.6 cm         Lead         msc
   14   -7.4 cm   11.6 um    -16 um    183 keV  8.42 keV  2.91 um    1.6 cm         Lead         msc
   15   -7.4 cm   9.19 um  -15.2 um    179 keV  3.53 keV  2.91 um    1.6 cm         Lead         msc
   16   -7.4 cm   9.12 um  -13.3 um    166 keV  13.3 keV  2.91 um    1.6 cm         Lead         msc
   17   -7.4 cm   9.05 um  -10.9 um    151 keV    15 keV  2.91 um    1.6 cm         Lead         msc
   18   -7.4 cm   9.87 um  -8.65 um    139 keV  11.4 keV  2.91 um    1.6 cm         Lead         msc
   19   -7.4 cm   11.8 um  -7.48 um    122 keV  17.5 keV  2.91 um    1.6 cm         Lead         msc
   20   -7.4 cm   11.8 um  -5.74 um    113 keV  8.55 keV  2.91 um   1.61 cm         Lead         msc
   21   -7.4 cm   11.5 um  -3.53 um    108 keV  5.49 keV  2.91 um   1.61 cm         Lead         msc
   22   -7.4 cm   12.2 um  -1.79 um   96.2 keV  11.7 keV  2.91 um   1.61 cm         Lead         msc
   23   -7.4 cm     12 um   1.37 nm   81.9 keV  14.3 keV  2.91 um   1.61 cm         Lead         msc
   24   -7.4 cm     12 um   1.67 um   53.5 keV  28.3 keV  2.91 um   1.61 cm         Lead         msc
   25   -7.4 cm   11.1 um    743 nm   15.8 keV  37.7 keV  2.91 um   1.61 cm         Lead         msc
   26   -7.4 cm   11.1 um    692 nm      0 eV   31.6 keV  1.34 um   1.61 cm         Lead   LowEnBrem
---> End of event: 0
   Absorber: total energy: 315.802 keV       total track length: 68.3867 um 
        Gap: total energy:       0 eV        total track length:       0 fm 
=======================================================================

Something must be wrong in Geant4, I think.

Could you let me know ow this happens?

Thanks,

--Yuxin

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1 Feedback: Re: Energy deposition errors ?   (Peter Gumplinger - 05 Sep, 2007)
3 None: Re: Energy deposition errors ?   (michel maire - 06 Sep, 2007)
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