It is not convenient that G4GeneralParticleSource class can not set particle energy, moment direction?

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1

By the way, it is ineffective when using G4GeneralParticleSource class to set particle position.

2

Hello,

Is this a question or are you ranting?

I suppose this is a question…:
You can control particle energy, moment direction and particle position of the GPS via a macro file or macro-commands with

/gps/position 0 0 0 #GPS origin position
/gps/direction 0 0 1 #momentum oriented along the Z axis
/gps/ene/type Mono #for monoenergetic: I=E
/gps/ene/mono 14. MeV #sets energy for monoenergetic sources

(I am using Geant4 v10.7)
Regards
Max

3

I can use G4GeneralParticleSource class to define the source particle through command or macro file,
I just hope to integrate the advantage of G4ParticleGun and G4GeneralParticleSource classes.

4

Have you looked at $G4INCLUDE/G4GeneralParticleSource.hh? You’ll see that there’s an interface you can use, with basic functions parallel to what’s in G4ParticleGun.

5

yes, i kown the energy and direction of the particle can be set by mac command, but it can not set by hardcode, so it is difficult to achieve complex source.

6

Did you look at the .hh file? If you are only throwing single particles, you can call functions in your C++ application to set the energy and direction.

7

I did not look at the .hh file, but i refered to HTML help document, there is no related functions about setting enegy and direction in G4GeneralParticleSource class, and the
inteligence of c++ did not display the related functions。

8

this is also an option:

G4UImanager* UImanager = G4UImanager::GetUIpointer();
UImanager->ApplyCommand("/gps/direction 0 0 1");
...
9

Whilst it’s not totally obvious, the key member of functions of G4GeneralParticleSource are (see the LXR browser for details)

class G4GeneralParticleSource : public G4VPrimaryGenerator
{
 public:
  void AddaSource (G4double);
        // Add a new particle gun with the specified strength
  inline G4SingleParticleSource* GetCurrentSource() const
        // Return the pointer to current particle gun
...

Now it’s correct that G4GeneralParticleSource doesn’t provide direct member functions to set energy/etc of the current source, but it’s always possible, in C++, to get a pointer to the current source and then access its position, angle, energy generators:

It’s also possible to see how the UI commands translate to calls to G4GeneralParticleSource through the implementation of its UI messenger class. As a general particle source, the setup isn’t going to be as simple as a standard fixed energy/direction particle gun, though it’s entirely possible to set up the GPS to do that.

10

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