This repository keeps track of updates to the ENDF files of the Fusion Evaluated Nuclear Data Library (FENDL) whose different versions are published on the IAEA-NDS website at https://www-nds.iaea.org/fendl/.
Please note that the ENDF files are not directly stored in this repository but symlinks to them. The command line tool git-annex can be used to download the ENDF files. Alternatively, you can download the ENDF files from the IAEA-NDS website. Please take note of the terms of use for this repository.
The command line tool git-annex must be installed on your system.
Installation instructions for various operating systems
can be found here. Windows is for the time being
not well supported. If you are using conda, you can install
git-annex by
conda install -c conda-forge git-annex
The command line tool git can be used in the usual way to
browse different versions of the repository. First,
download the repository to your local computer:
git clone https://github.com/iaea-nds/fendl-endf
After changing into the directory of the repository, check out the specific version of FENDL you are interested in. For instance, to use FENDL-3.2b:
git checkout FENDL-3.2b
All ENDF files are available as (broken) symbolic links.
In order to download their content, you need to use git-annex.
For instance, being at the root directory of the repository,
you can download the neutron transport sublibrary by
git annex get --jobs=4 general-purpose/neutron
This command works recursively so running git annex get .
at the root will download all transport and activation files
of all sublibraries. It is also possible to download individual
files. The --jobs argument enables the download of files
in parallel.
After running git annex get, the symbolic links will not
be broken anymore and point to the files that store the
file contents. These files are stored in the
.git/annex directory but you should not directly
interact with this directory and instead use the functionality
of git-annex.
If you want to remove dowloaded files, e.g., because you
are running out of space, you can use git-annex-drop:
git annex drop general-purpose/neutron
It will remove the files from the annex and symlinks
in the repository will be broken again.
You can re-download them whenever needed
using the git annex get command explained above.
If you are an evaluator, you may want to change individual ENDF files. By default, file content is write-protected and modifying an ENDF file by opening the symlink in an editor will not work.
To modify a file, first unlock the file. For instance, to unlock all files in the neutron sublibrary from the root directory of the repository, run
git annex unlock general-purpose/neutron
This command will replace the symlinks by regular files.
Now you can modify those files. Once you are satisfied
with the changes, you need to invoke the git annex analogon
to git add, which is
git annex add general-purpose/neutron
This will move modified file content into the annex
(stored in .git/annex) and replace the files in
the git repo by symbolic links.
Now you can commit the the modifications with git in the usual way, e.g.,
git commit -m 'some changes to the neutron sublibrary'
Finally, if you have unlocked files without effecting changes and want to lock them again (i.e. replace the files by symlinks), run
git annex lock general-purpose/neutron