From: Chris Theis (Christian.Theis@cern.ch)
Date: Tue Dec 20 2005 - 17:50:35 CET
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: Christian.Theis@cern.ch www: http://www.cern.ch/theis ------------------------------------------------------------------------ --
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