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Forum: Fields: Magnetic and Otherwise
Re: Question Electrons misteriously killed (Lafont Fabien)
Date: 14 Apr, 2014
From: Gumplinger Peter <Gumplinger Peter>

Dear Fabien,

> A tub with r_min = 46*mm and r_max = 50*mm length= 1.2*m, filled with
> vaccum. There are also two end plates acting as detectors. Particle is
> killed when it travels in the wall of the tub
> 
> All along this tub, exists a magnetic field (combination of a permanent
> octupole and some solenoids) computed from a BField map.
> 
> The aim of the computation is to evaluate the percentage of electrons
> that reach the detectors before collide the wall.
> 
> My problem comes from some electrons that are killed somewhere in the
> vaccum of the tub (this is actually the world volume)

Do I understand you correctly - a G4Tubs with r_min>0 is your 'world volume'? This is probably not a very good idea. The space r<r_min is then "undefined"!

May I suggest that you define your geometry differently all together. Define the world G4Tubs r_min=0 and r=r_max. Then place a daughter inside the world again with r_min=0 and r=46*mm.

Now, you have two options, you can associate your field with only the daughter (see field03 example), or you can associate the field everywhere. That'll work because you are apparently anyway killing any particles outside the daughter.

Let us know if this doesn't work better for you.

Peter

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