angular distribution

From: Michela Cozzi (michela.cozzi@bo.infn.it)
Date: Mon Jun 16 2003 - 12:05:09 CEST

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    Hi, in the new version of FLUKA,
    I have a problem in setting the beam properties, in particular in the
    angular distribution.
    In the input BEAM, I set the WHAT(3) equal to 3 mrad in this way:

    BEAM 2.0 -3.0 -1.0
    PION-
    BEAMPOS 0.0 0.0 -2.0

    But then, looking to the file.out, I have 30 mrad!
    Do you know where the problem is?

     ******* Fluka beam properties:

     Beam particle: PION- Id: 14 (Fluka) -211 (PDG) Charge: -1 Baryon n.:
    0
                    Mass: 0.1396 (GeV/c^2) Mean life: 2.6030E-08 (s) Weight:
    1.000
     Average beam momentum: 2.000000 GeV/c
     Average beam kinetic energy: 1.865294 GeV
     Momentum deviation at FWHM (Rectang.): 0.0000000 GeV/c
     Beam hit position: 0.00000000 0.00000000 -2.00000000
    cm
     Beam direction cosines: 0.00000000 0.00000000 1.00000000
     Emittance option not used.
     Beam width in X-direction at FWHM (Gaussian): 1.0000 cm
     Beam width in Y-direction at FWHM (Gaussian): 1.0000 cm
     Beam divergence at FWHM (Gaussian): 30.0000 mrad
     Region number of the spot is: 2

    Thanks,
    Michela

    -------------------------------------------------
                       Michela Cozzi
                 University of Bologna
            Physics Department - INFN
     Viale Berti Pichat, 6/2 40127 Bologna
                          ITALY

           michela.cozzi@bo.infn.it

           Tel: +39-(0)51 209 5234
           Fax: +39-(0)51 209 5269
    ---------------------------------------------------

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