Hi, What are the ways / methods to simulate the detector response in Geant4?. Thanks
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Ok, thanks for your reply. Now I think I understand things a little better; I think it´s a matter of practice and study.
As a complement to your answer, I have read on the Internet that in addition to Geant4 Digitization as a way / method to simulate the detector response there is also the Command-based Scoring, G4MultiFunctionalDetector and G4PrimitiveScorer, and Sensitive Detectors and Hits, right?
In other words, does the above mean that there are 4 ways / methods (Digitization, Command-based Scoring, G4MultiFunctionalDetector and G4PrimitiveScorer, and Sensitive Detectors and Hits) to simulate the detector response?; What is your opinion?.
Is it enough if I simulate the detector response only using Sensitive detectors and Hits?, Why yes?, Why not?. Are there examples (extended or advanced) in the Geant4 toolkit that describe or include digitization / digitizer module?
Scorers (as you can learn from the documentation) simply record hits, or selected information from hits. Digitization (as you can also learn from the documentation) is an additional processing stage within the Geant4 event loop, which takes the hit data and applies additional algorithms (written by the user in C++) to emulate features of the readout electronic or other processing.
There are several examples which demonstrate digitization. You should be able to find them in the documentation describing all of the examples.
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Ok, thanks for all the information. I understand some things better. Regarding the first paragraph of your previous post, Could you please give a description / recipe (as a numbered list) of how I have to do / write those additional algorithms (applied to hit data) you mentioned?, in other words, Could you give a description of those additional algorithms?. So, I’m going to take a look at the Geant4 Documentation to see which examples describe or include Digitization.
No, I can’t. You can do that research yourself. Digitization models your electronics response. You might include random fluctuations due to noise, you might incorporate a convolution with a resolution function, or any number of other things. Learning how to model electronic readouts is not part of Geant4.
Ok, thanks for your reply. I have learned some new things. However, I still have some questions, this is because of the following:
With the “Geant4 Hits” I can obtain counts (energy deposits of gamma particles in a specific volume of the detector, for example), and with that I can make a histogram of counts versus energy; on the other hand, with “Geant4 digitization” I could also obtain counts, right?, But in this case these digitization counts would be very similar to the counts of the experiment, right?.
In other words, one could say that in a Geant4 simulation there are 2 types of counts, right?: those obtained only with Sensitive Detectors and Hits, and those obtained using Digitization, right?; in other words, in a simulation Geant4 there are “Hits Counts“ and “Digitization counts“, right?; What is your opinion?
So, I’m going to learn Digitization with the Geant4 examples related to digitization and reading the documentation I find on the internet.