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None Problems with sensitive detector 

Keywords: Sensitive detector
Forum: Hits, Digitization and Pileup
Date: 05 Mar, 2008
From: <maria.antonietta.piliero@pi.infn.it>

Hello, I've got problems with my sensitive detectors.

I adopted the Hadrontherapy example as model for the read-out geometry and sensitive detector of a slab of silicon (300 um thickness). Only xz pixelation has been implemented in my case.

62 MeV protons are delivered to the sensitive detector and a step limiter of 50 um is adopted within the sensitive detector (i.e., at least 6 steps are registered per particle). The traking verbosity confirms the number of steps and shows an energy loss at each step, however it appears that the sensitive detector only records the first interaction. The function ProcessHits() is invoked only for the first interaction of the primary particle, and the number of Hits per event is always only 1.

I have already followed the suggestions in post number 68 but it doesn't seem to be my case because I don't have volume overlapping.

Do you have any suggestion?

Thank you, Maria Antonietta Piliero

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

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0   -2.5 cm      0 fm      0 fm     62 MeV     0 eV      0 fm      0 fm    WorldPhys    initStep
    1      0 fm      0 fm      0 fm     62 MeV3.97e-18 eV    2.5 cm    2.5 cm    WorldPhys  Transportation
    2     50 um   -104 nm  -87.2 nm   61.9 MeV    88 keV    50 um    2.5 cm   MedipixPhys  StepLimiter
ProcessHits invoked
    3    100 um   -121 nm   -103 nm   61.8 MeV  66.7 keV    50 um   2.51 cm   MedipixPhys  StepLimiter
    4    150 um   69.4 nm   -145 nm   61.8 MeV  76.9 keV    50 um   2.52 cm   MedipixPhys  StepLimiter
    5    151 um   70.6 nm   -147 nm   61.8 MeV  1.44 keV  1.16 um   2.52 cm   MedipixPhys       hIoni
    6    201 um   90.3 nm   -229 nm   61.7 MeV  78.6 keV    50 um   2.52 cm   MedipixPhys  StepLimiter
    7    251 um   28.2 nm   -194 nm   61.6 MeV  71.4 keV    50 um   2.53 cm   MedipixPhys  StepLimiter
    8    267 um  -21.2 nm   -217 nm   61.6 MeV  39.3 keV  16.2 um   2.53 cm   MedipixPhys       hIoni
    9    300 um   -119 nm   -294 nm   61.5 MeV    48 keV  32.6 um   2.53 cm   MedipixPhys  Transportation
   10    2.5 cm  -94.6 um    -47 um   61.5 MeV3.95e-18 eV   2.47 cm      5 cm   OutOfWorld  Transportation

*********************************************************************************************************
* G4Track Information:   Particle = e-,   Track ID = 2,   Parent ID = 1
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0    151 um   70.6 nm   -147 nm   13.9 keV     0 eV      0 fm      0 fm   MedipixPhys    initStep
    1    151 um   -313 nm    513 nm      0 eV   13.9 keV  2.66 um   2.66 um   MedipixPhys       eIoni
---> End of event: 0
   Absorber: total energy:       0 eV        total track length:       0 fm 
        Gap: total energy: 484.22691 keV       total track length: 302.66586 um 
numberOfHits 1

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