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Forum: Geometry
Re: Question How to extract the hit information and build readout geometry (Pradip Datta)
Date: 21 Apr, 2009
From: michel maire <michel maire>

On Tue, 21 Apr 2009 07:50:02 GMT, Pradip Datta wrote:
> Hi all,
> 
> I am new in geant4. I am modifying the ExN02 for my purpose. I have
> already built my geometry (which is quite complex), I can visualize the
> events and the process. But I need something more for which I am not
> getting any clue. It will be immense help if somebody help me to sort my
> problems.
> 
> I have two problems:
> 
> 1. I have placed 4 identical Boolean solid (Detector) in world space
> using a loop and thus every detector has its own copy no. My question is
> that how to retrieve the detector number (that is "i") which has got the
> hit? and what is the total energy deposition by all the physical process
> in that detector (not interested in the detailed processes but in total
> energy)?
> 

  See the attached file, which is a copy of a geant4 faq (User Support->FAQ)

  See also examples/extended/electromagnetic/TestEm3 : SteppingAction
  ________________________________________________________________________________
> 
> 2. Can any body give me a simple example that how can I define a readout
> geometry? Actually I have constructed the detector using many small
> components to reproduce the shape. However, in reality readout is taken
> only from two segment of that detector. For simplicity, the detector can
> be considered as a box (say of size 4 x 4 x 4). I want make readout
> geometry such that I can differentiate between the hits in z/2 plane.
> The hit position may be in world coordinate but in output I need the
> segment no. detector no and the total energy deposition (not by a single
> process but sum of all process)
> 
>

 I hope a relevant expert will help you.
 In waiting, you can have a look to exercices proposed at ORNL_2008 geant4 tutorial :

 http://www.ge.infn.it/geant4/events/ornl_2008/lecture_notes.html

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/04/21/08.46-57871-StepAction2.faq.txt

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