[fluka-discuss]: Too many errors in geometry

From: Timotheus Cooijmans <tim.cooijmans_at_cern.ch>
Date: Mon, 17 Mar 2014 14:17:31 +0000

Hi,

I'm working through the lecture slides and exercises of last October's FLUKA course (at http://www.fluka.org/fluka.php?id=course&sub=program&navig=2&which=dresden2013 ) and got stuck at Exercise 8. FLUKA (2011.2b-linuxAA) keeps giving up after too many errors like the following:

> Geofar: Particle in region 2 (cell # 0) in position -1.203992411E+12 -4.012447545E+09 -1.924933464E+04
> is now causing trouble, requesting a step of 9.998519596E+04 cm
> to direction -9.785927409E-01 1.816700853E-03 2.057983166E-01, error count: 0
> R2: 1.203999097E+12 R3: 1.203999097E+12 cm
> X*U (2D): 1.178210944E+12 X*U (3D): 1.178210940E+12 cm
> X*UOLD(2D): 1.178210944E+12 X*UOLD(3D): 1.178210940E+12 cm
> Kloop: 109, Irsave: 2, Irsav2: 2, error code: -33 Nfrom: 4999
> old direction -9.785927409E-01 1.816700853E-03 2.057983166E-01, lagain, lstnew, lsense, lsnsct F F F F
> Particle index 3 total energy 9.864196244E-04 GeV Nsurf 4
> Try again to establish the current region moving the particle of a 9.664039024E+00 long step
> We succeeded in saving the particle: current region is n. 2 (cell # 0)
> Geofar: Particle in region 2 (cell # 0) in position -1.203992411E+12 -4.012447545E+09 -1.924734579E+04
> is now causing trouble, requesting a step of 9.998519596E+04 cm
> to direction -9.785927409E-01 1.816700853E-03 2.057983166E-01, error count: 1
> R2: 1.203999097E+12 R3: 1.203999097E+12 cm
> X*U (2D): 1.178210944E+12 X*U (3D): 1.178210940E+12 cm
> X*UOLD(2D): 1.178210944E+12 X*UOLD(3D): 1.178210940E+12 cm
> Kloop: 113, Irsave: 2, Irsav2: 2, error code: -33 Nfrom: 4999
> old direction -9.785927409E-01 1.816700853E-03 2.057983166E-01, lagain, lstnew, lsense, lsnsct F F F F
> Particle index 3 total energy 9.864196244E-04 GeV Nsurf 0
> Try again to establish the current region moving the particle of a 9.664039024E+00 long step
> [...]
> We succeeded in saving the particle: current region is n. 2 (cell # 0)
> Abort called from FLKAG1 reason TOO MANY ERRORS IN GEOMETRY Run stopped!
> STOP TOO MANY ERRORS IN GEOMETRY

The input file ex8.inp is attached. In an attempt to track down the problem, I distilled it down to ex8_debug.inp, which also exhibits the problem. My colleague -- otherwise a venerable master in the ways of FLUKA -- could not identify the cause either.

What am I doing wrong?

Thanks,
Tim




Received on Mon Mar 17 2014 - 16:34:12 CET