Initially you should expect to need about 100 Mbyte of disk space to install and run FLUKA. In addition a FORTRAN compiler is required for your platform to generate the FLUKA executable. After a successful download you will find a compressed Unix tar file which contains the FLUKA package. You should be using a Unix system at this point.
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For the purpose of these instructions, lets call the directory myFlukaArea and the file fluka2006.3b-linuxAA.tar.gz. The following commands will perform the installation.
mkdir myFlukaArea mv fluka.tar.gz myFlukaArea/. cd myFlukaArea gunzip fluka2006.3b-linuxAA.tar.gz tar -xf fluka2006.3b-linuxAA.tar setenv FLUPRO /somePath/myFlukaArea
The last command line implements an environment variable which is required by the utility scripts that ship with FLUKA (under \$FLUPRO/flutil). This line is specific to the Unix SHELL one uses. The above example is the correct syntax for tcsh/csh. In case of bash the equivalent command would read
export FLUPRO=/somePath/myFlukaArea
The next important step for a successful installation: take a look at the README and the RELEASE-NOTES, in particular if you are a new user. Technically, FLUKA is setup at this point.
With the FLUKA package you received a current version of the FLUKA manual. The manual is the major source of information/help for preparing and running FLUKA. A current version of the manual is available online.
Always a good way to get started with a new software tool is to study well documented examples. We are starting to provide a list of such examples for various physics conditions. Here you can find the initial list: examples.