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Keywords: sensitve detector
Forum: Event and Track Management
Re: Question can sensitive detectors be used to filter out secondary particles .. ? (Manju Sudhakar)
Date: 24 Nov, 2004
From: michel maire <michel maire>

User Manju Sudhakar wrote:

>> Dear Geant Users,
>> 
>>   I need help ..
>> 
>> Suppose I have a sample material, say Silicon.I irradiate it with
>> photons of a particular energy. The photons interact with the material
>> and produce secondaries, electrons and photons. I am interested in the
>> secondary electrons. If I place a sensitive detector below the material,
>> it registers a hit only if a primary particle, the photon impinges on
>> the sensitive detector. What I want is for the sensitive detector to
>> register a hit when the secondary electron impinges on it, because I
>> want to accumulate the electrons and plot a spectrum. Right now, I'm
>> using a counter in the mySteppingVerbose.cc to filter out the necessary
>> particles and count them as they pass into the counter.
>> 
>> My questions are :
>> 
>> 1 ) Is it possible to select the particle of our choice to be registered
>> as a hit in the sensitive detector ? 2 ) Is it possible to have many
>> sensitive detectors that are "sensitive" to different particles ?
>> 
>>   Thanks.
>> 
>> Manju Sudhakar.

 Experts will answer you about sensitive detectors.

 I wish to make one comment : if you want only to plot the spectrum 
 of electrons which exit the silicon, you do not need the concept of
 sensitive detectors and hits collection. You can do the plots directly 
 in SteppingAction or TrackingAction.

 examples/extended/electromagnetic/TestEm5 is designed to produce such kind
 of plots. See the README. In your case it is the plot number 4. The example
 could be run with a typical macro as bellow:

 #
 # macro file for TestEm5.cc    
 #     		    
 /control/verbose 2
 /run/verbose 2
 #
 /testem/det/setAbsMat Silicon      
 /testem/det/setAbsThick 1 mm
 /testem/det/setAbsYZ    2 mm
 #
 /testem/phys/setCuts 1 mum   
 #
 /run/initialize
 #
 /testem/gun/setDefault
 /gun/particle gamma 
 /gun/energy 1 MeV
 #
 /testem/histo/setFileType hbook		#for paw
 /testem/histo/setFileName 1mum.paw
 /testem/histo/setHisto 4  100 0. 1000. keV	#energy at exit  
 #
 /testem/event/printModulo 100000
 # 
 /run/beamOn 1000000

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