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Forum: Event and Track Management
Re: None Ion beam disappears entering in quadrupole field (Jorge Gallardo)
Re: Feedback Re: Ion beam disappears entering in quadrupole field (Gumplinger Peter)
Re: None Re: Ion beam disappears entering in quadrupole field (Jorge Gallardo)
Re: Feedback Re: Ion beam disappears entering in quadrupole field (Gumplinger Peter)
Re: None Re: Ion beam disappears entering in quadrupole field (Jorge Gallardo)
Date: 21 Mar, 2014
From: Gumplinger Peter <Gumplinger Peter>

> > If you rotate around Z, all you are doing is rotate the quadrupole
> > around its length axis. Is this what you want?
> 
> Yes, in order to simulate a quadrupole triplet, I need three quadrupole
> fields. The quadrupole in the middle of the triplet is rotated 90 degrees
> in z-axis relative to the other two. The three quadrupoles are different
> instances of the same class, differing just in that angular argument when
> constructed.

OK

> I suppose that the G4QuadrupoleMagField class was made by Geant4 in order
> > to focus/rearrange beams in accelerator experimental beamlines, and if
> > true, the z-axis should be the default axis of the beam to focus,

Yes

> (because
> > is clear that the three main-axes of the quadrupole are not equivalent)...
> > Then, seems to me a little anti-natural to needing to rotate the quadrupole
> > in the other axes (X and Y)...

Sorry, I confused you then! You want to rotate around Z and so I don't see anything wrong with your code. You have a beamline that is down the z-axis and you want to focus with a triplet.

Set /tracking/verbose 1 and send a particle down the z-axis. If all goes right, this particle should not be deflected. If you then send one down a little off axis it should not hit the side of your quadropoles. If however, you have strong fields, rays too far off axis or too skew will hit your magnets. You should see that happend with the verbosity on.

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1 None: Re: Ion beam disappears entering in quadrupole field   (jorge gallardo - 01 Apr, 2014)
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