Re: Energy deposit in thin regions

From: John Clem (clem@bartol.udel.edu)
Date: Sun Jun 13 2004 - 20:09:27 CEST

  • Next message: Alberto Fasso': "Re: Energy deposit in thin regions"

    It has been my understanding the maximum step size in a non-vacuum
    region without a field should not be greater than ~ 1/3 of its minimum
    dimension to allow the multiple-scattering routines to work properly.

    This is briefly discussed in the documentation under STEPSIZE

    John

    On Sat, 12 Jun 2004, Paolo MAESTRO wrote:

    >
    > Hi Fluka users,
    > I simulated a sampling calorimeter
    > made of tungsten layers (0.35 cm thick)
    > alternated with planes made of 0.05 cm thick scintillator.
    > I noticed that protons (150 GeV kin. energy),
    > passing through the detector as minimum ionizing particles,
    > deposit energy in each scintillator plane only at the end of
    > the considered region at the boundary with the next region.
    > To explain better, if a scintillator plane extends
    > from z= -0.35cm to z=-0.4 cm
    > , dumping the energy deposit in MGDRAW & ENDRAW
    > subroutine of mgdraw.f, it turns out that
    > the deposit is recorded at z=-0.4 cm, i.e.
    > at the boundary with the next tungsten layer.
    > This has no physical meaning, and I guess it depends from
    > the fact that the step size is bigger than the considered region
    > thickness. I tried to set by hand a step size for the scintillators planes
    > using the STEPSIZE options and it seems working well.
    > But I wonder:
    > - which is the empirical rule to set the min and max stepsize ?
    > (I tried min = 1/50 scintillator thickness and max = 1/10)
    > - in my case, do I need to set STEPSIZE also for tungsten layers?
    > - is this procedure to avoid the energy deposit at boundaries correct ?
    >
    >
    > Many thanks for your help.
    > Best regards
    >
    > Paolo Maestro
    >
    >
    >
    >


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