Re: A question on source file

From: Sharmalee Randeniya <>
Date: Tue, 30 Sep 2008 10:44:48 -0500

Hi Thilo,

The width of the beam can be set by restricting the initial position
of the beam particles(that is XFLK, YFLK, ZFLK) to the region that you
need. Here is an example.

In the following example the Z coordinate is always set to -10 cm.
X and Y are always a value between -40 cm and +40 cm. That is beam
width in X and Y are set to 80 cm.

XFLK (NPFLKA) = -40.D0 + 80.D0 * FLRNDM(DUMMY)
YFLK (NPFLKA) = -40.D0 + 80.D0 * FLRNDM(DUMMY)
ZFLK (NPFLKA) = -10.D0

One very important remark, I suggest u to use good FORTRAN programming
styles in FLUKA. Please read the Alberto's advice in the FLUKA discuss
arcive. The link is


Quoting Thiloshana Ranawaka <>:

> Hi,
> I have a problem regarding about the source code.I am trying to
> input the energy distribution of cosmic ray muons
> into the source code.The problem that I have is how do I specify the
> beam width into the source.f file ?. Are there any specific stacks that
> we have to include when specifying the beam width? I have attached the
> source.f file for your convenience.
> Thanks!!!
> Thilo
Received on Tue Sep 30 2008 - 17:53:55 CEST

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