Re: FLUKA: meaning of geometry parameters
On Sat, 14 Apr 2001 vylet001@mc.duke.edu wrote:
> Dear Fluka users,
>
> I am having trouble with geometry, but many runs with GEOEND ...debug did
> not find
> anything wrong so far. I would appreciate if someone could explain the
> meaning
> of the parameters below. I suspect that some of these are coordinates and
> directionnal
> cosines, but more detailed info would be helpful. If this is documented
> somewhere,
> please let me know. Is IR region number? (Region #1 in my case is a black
> hole).
>
> 0EXIT BEING CALLED FROM G1, NEXT REGION NOT FOUND.
> IR= 1 XB=-0.36456044D+06 0.61141094D+06-0.88888880D+06
> WB=-0.32012556D+00 0.53688887D+00-0.78055747D+00 DIST= 0.14234839D+06
> IRLTGG= 0 SB=-0.36456044D+06 0.61141094D+06-0.88888880D+06
> UB=-0.32012556D+00 0.53688887D+00-0.78055747D+00
> PR 10-0.36456044D+06 0.61141094D+06-0.88888880D+06-0.32012556D+00
> 0.53688887D+00-0.78055747D+00 1
> 1 1 1 -5 -4 0 0
> 18 14 11
> 296 304 22 107 109 15 0
> 308 10 10
> -0.10000000D+21 0.10000000D+21 0.14234839D+06 0.14234839D+06
Hi Vashek,
IR is indeed the region number, but in general this is not the most
useful piece of information. The message says that there is a problem
when tracking from point XB (XB(1) = x, XB(2) = y, XB(3) = z)
in the direction of vector WB (WB(1) = u, WB(2) = v, WB(3) = w)
by a distance DIST. Therefore, there is something wrong in your geometry
between the points
x = -0.36456044D+06 x' = x - 0.32012556D+00 * 0.14234839D+06
y = 0.61141094D+06 y' = y + 0.53688887D+00 * 0.14234839D+06
z = -0.88888880D+06 z' = z - 0.78055747D+00 * 0.14234839D+06
This is not mentioned in any FLUKA documentation because in general the
FLUKA geometry debugger is sufficient and more friendly. I am surprised
that it did not find the bug in your case: have you tried to change the
mesh? Anyway, this kind of message is part of the standard Combinatorial
Geometry package as implemented in other codes such as MORSE.
Alberto
--
Alberto Fassò
CERN-EP/AIP, CH-1211 Geneve 23 (Switzerland)
Phone: (41 22) 767 2398 Fax: (41 22) 767 9480 Alberto.Fasso@cern.ch
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