[fluka-discuss]: ROT-DEFI indices and names

From: Timotheus Cooijmans <tim.cooijmans_at_cern.ch>
Date: Thu, 25 Sep 2014 08:23:28 +0000

Hello FLUKA experts,

How do ROT-DEFI indices and names interact? I'm trying to (programmatically) define a composite rototranslation (i.e. multiple ROT-DEFI cards with the same identifier). I'd like to only have to provide a name and not worry about the index. Here's the relevant manual excerpt:

     WHAT(1) : assigns a transformation index and the corresponding
               rotation axis
              =< 0.0 : the card is ignored if SDUM is empty, otherwise SDUM is
                       kept as the rotation name, and the first free rotation
                       number is used
> 1000 : interpreted as j + i * 1000
> 100 and < 1000 : interpreted as i + j * 100
                                 (note the inversion of i and j!)
> 0 and =< 100 : interpreted as i, and j assumed to be = 0
                       where i = index of the rotation
                              j = 1 rotation with respect to x axis
                                = 2 rotation with respect to y axis
                                = 0 or 3 rotation with respect to z axis
                              (see Note 4)
               Default = 0.0 (no transformation defined)

Two things puzzle me about this:
  * I can only give the transformation a name if I set WHAT(1) <= 0, but then I can't choose j.
  * Two cards with the same name and unspecified index (WHAT(1) = 0) will be assigned different indices.

It would be great if someone could shed some light on this situation.

Many thanks,
Tim
Received on Thu Sep 25 2014 - 12:03:30 CEST