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Feedback Re: angles and tracklengths of (secondary) particles 

Forum: Event and Track Management
Re: None angles and tracklengths of (secondary) particles (Leif Raedel)
Date: 16 Aug, 2011
From: Gumplinger Peter <Gumplinger Peter>

Hi Leif,

Are your muons starting out with momentum along the z-direction? If so, the very first PreStepPoint's direction will always be along the z-axis (alpha=0deg). You may want to plot the PostStepPoint's direction instead. The multiple scattering angle and the step length are correlated but that angle relates to the direction at the PreStepPoint; e.g. the change of direction during a step and not relative to the initial direction several steps prior.

The edge you find at 60 degrees is probably due to your initial condition (muon kin. energy) being always the same and hence the chosen first simulation step in ice isn't very different from one track history to the next.

I don't know what you are after with your simulation but if you want to know the distribution of muon directions after a given thickness of ice you better simulate slabs of ice and histogram the directions with which the muons emerge.

Hope this helps, Peter

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1 None: Re: angles and tracklengths of (secondary) particles   (Leif Raedel - 16 Aug, 2011)
(_ News: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 16 Aug, 2011)
(_ None: Re: angles and tracklengths of (secondary) particles   (Leif Raedel - 17 Aug, 2011)
(_ Feedback: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 17 Aug, 2011)
(_ None: Re: angles and tracklengths of (secondary) particles   (Leif Raedel - 18 Aug, 2011)
(_ Feedback: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 18 Aug, 2011)
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