Message: Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it? Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it? 

Forum: Physics List
Re: Question Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?
Re: None Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it? (Michael H. Kelsey)
Re: Question Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?
Date: 28 May, 2013
From: Michael H. Kelsey <Michael H. Kelsey>

zhaodh@bao.ac.cn writes:
> Since the optical photons can be assigned whatever energy we wish. I
> think for the photons with given energy, if we want to simulate their
> boundary processes we can set the photons as "opticalphoton" and define
> the corresponding optical material properties; if we want to simulate
> their EM and photo-nuclear processes we can set the photons as "gamma".
> 
> Do you think so?

Sort of.  You cannot change the "type" of a particle after the G4Track
has been created -- G4OpticalPhoton and G4Gamma are two different objects,
with different data members and different pointers (addresses).

Also, processes _create_ new secondary particles, and those new secondaries
will be created according to how the process has been written.  If a process
(like photoevaporation) creates a photon, it is _always_ going to create a
G4Gamma.  

If you want to write your own process, which duplicates what
photo-evaporation does, but creates G4OpticalPhotons, you're free to do that
and put it into your own physics list.  See the GEANT4 Toolkit Developer's
Guide.  But that is not going to be easy, nor will we be able to help you
very much with the outcome.

What you *could* do for your own study is to use the particle gun to
generate primary particles (either "gamma" or "opticalphoton"), and just
study how they propagate through your geometry.

      -- Michael Kelsey

 Add Message Add Message
to: "Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]