Re: Strange messages in the err file

From: Sebastien WURTH (
Date: Wed Dec 21 2005 - 09:14:00 CET

  • Next message: Giuseppe Battistoni: "Re: Strange messages in the error file"

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    Chris Theis a écrit :

    >Dear Sirs,
    > I'm currently performing FLUKA simulations where I start 7 TeV protons
    > in a beam pipe for beam loss calculations. During the runs I encounter
    > some interesting messages in the error file, which I do not understand
    > and where you probably could shed some light on this. However, I have
    > to mention that these messages do not crash the program I would very
    > much like to understand them and their cause.
    > During the whole run I receive quite an amount of messages like the
    > following:
    > Eventv: ekin+am < pla,ij,igreyt 5.53165567 5.54778857 14 1
    > *** Kaon: P_min > 1.5 GeV/c: 15 1.52972114
    > I recon the ekin+am is the sum of the kinetic energy and the rest mass
    > but the rest of the message is rather unclear as I have no clue what
    > pla, ij, igreyt and those numbers mean.
    > Furthermore I get messages like the one below from the tracker:
    > Geofar: Particle in region 95 (cell # 0) in position
    > 9.493944493E-01 -8.027766844E+00 -3.509927151E+02
    > is now causing trouble, requesting a step of 5.595938336E+00 cm
    > to direction 2.293323168E-02 -1.062827117E-02 9.996805023E-01,
    > error
    > count: 0
    > R2: 8.083711420E+00 R3: 3.510857907E+02 cm
    > X*U (2D): 1.070939658E-01 X*U (3D): -3.507734798E+02 cm
    > X*UOLD(2D): 1.070939658E-01 X*UOLD(3D): -3.507734798E+02 cm
    > Kloop: 3653483, Irsave: 95, Irsav2: 202, error code: -3
    > Nfrom: 21
    > old direction 2.293323168E-02 -1.062827117E-02 9.996805023E-01,
    > lagain, lstnew, lsense, lsnsct F T F F
    > Particle index 14 total energy 4.066056530E+01 GeV Nsurf 0
    > We succeeded in saving the particle: current region is n. 93 (cell
    > # 0)
    > Unfortunately I wasn't able to figure out what error code -3 really
    > means and what could cause this problem. I debugged my geometry not
    > only with FLUKA's grid debugger, but also with other means and found
    > no problem like overlaps in that area.
    > Finally there are also a couple of lines like this:
    > *** Frmbrk: we are dealing with a bag of 8 388.916321
    > identical nucleons, go on folks! ***
    > Although that message seems to be quite encouraging I would be very
    > interested what it actually means.
    > Thank you very much for your assistance.
    > Cheers
    > Chris
    >Chris Theis
    >CERN/SC-RP - European Organization for Nuclear Research
    >1211 Geneva 23, Switzerland
    >Phone: +41 22 767 8069 Office: 865-RC-030
    >e-mail: www:
    Hello Christian,

    There is a part of the fluka manual which deals with error messages and
    yours are related.
    The first message is a problem of conservation failure : PLA is the code
    for the particule momentum if > 0 or kinetic energy if < 0, ij is the
    particle code.
    The other message with the "causing trouble particle" : it is
    recommended to center the DEBUGGER around the position of the problem
    (maybe you did that).

    I'm not really sure about that but I remember having such error messages
    when my regions did not have a proper material assignment. You could
    check this too.

    Hope it will help a little.

  • Next message: Giuseppe Battistoni: "Re: Strange messages in the error file"

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