|Message: Re: Bias in target but not in detector||Not Logged In (login)|
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Hello, There are some ways to do this, and with 10.0, you have new functionalities that provide pretty much what you are interested in (see examples/extented/biasing/GB02 as starting point, but we will need to discuss a bit more to adapt to your case). Are you interested in the statistical weight as well or "just" in the forcing of the interaction ? Cheers, Marc On 08/21/2014 04:28 PM, Cari C. wrote: > *** Discussion title: Physics List > > The issue I'm currently working on is wanting to bias a certain physics > process in my target for a fixed target simulation, but have no bias for > the rest of the simulation as the shower evolves in the detector. > > I want to bias G4eplusAnnihilation to get a 5 GeV positron beam hitting > a liquid hydrogen target to always result in 2 gamma annihilation. > Currently I modified the G4EmStandardPhysics.cc file to include a bias > on this process before adding it to a G4VModularPhysicsList. Since the > beam is much more energetic, I tried to place an energy cut at around > 4.8 GeV so that this process of e+e- -> 2gamma doesn't show up > incredibly biased--or at all in this case--in the detector built of may > CsI crystals. > > I've tried changing the cuts on the model, but when compiling, Geant > doesn't recognize the model. Perhaps this is a consequence of the model > being immediately invoked? (G4eeToTwoGammaModel) > > I also tried changing the physical properties of the target, but of > course that biased all the processes by the same factor and did not give > me the desired result. > > Ultimately I want to have a 2gamma event every time I turn on the beam, > and have all other normal EM processes occur in my detector. > > Is there a good way of going about this? > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/phys-list/835.html
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