FairRoot Documentation

The FairRoot framework

A simulation, reconstruction and analysis framework that is based on the ROOT system. The user can create simulated data and/or perform analysis with the same framework. Geant3 and Geant4 transport engines are supported, however the user code that creates simulated data do not depend on a particular monte carlo engine. The framework delivers base classes which enable the users to construct their detectors and /or analysis tasks in a simple way, it also delivers some general functionality like track visualization. Moreover an interface for reading magnetic field maps is also implemented.


FairRoot is distributed under the terms of the GNU Lesser General Public Licence version 3 (LGPLv3).

Release information

Please see : https://github.com/FairRootGroup/FairRoot/releases

Getting started

Please see : http://fairroot.gsi.de/getting_started for details.

Using the Project template

FairRoot deliver meanwhile a project template that can be used as a starting point for anybody who would like to build simulation and reconstruction on FairRoot. The project Template is in the FairRoot/template/project_template directory

The template demonstrate and implement the following:

  1. General structure of the software (cake config files, VMC/Geant configurations, etc ..)
  2. Example detector with sensitive and passive volumes (NewDetector) and data class
  3. Particle Stack for Geant3/4 with filtering infrastructure
  4. Event generators (Pathia6,8) more are available directly from FairRoot
  5. Passive component implementation (Magnet Yoke, Beam Pipe)
  6. Track visualisation tool (Event display)
  7. A rename script which replace all the generic names to user defined ones

Optional change of output tree name

By default, the name of the tree in output ROOT file is "cbmsim". In case you want to change it for your Project, you need to create "config" folder inside of top source directory of the Project and place there "rootmanager.dat" text file with following single line: "treename=name_you_chose".

```bash cd PROJECT_TOP_DIR mkdir config echo 'treename=name_you_chose' > config/rootmanager.dat ```

Step by Step installation

  1. Install FairSoft

    we use here "fair_install" as a directory name, you can use what you want! ```bash mkdir ~/fair_install cd ~/fair_install #git clone https://github.com/FairRootGroup/FairSoft.git git clone -b dev https://github.com/FairRootGroup/FairSoft.git cd FairSoft ./configure.sh

    1) gcc (on Linux) 5) Clang (on OSX)

    1) No Debug Info

    2) Internet (install G4 files from internet)

    path: ~/fair_install/FairSoftInst


  2. Install FairRoot


    Set the shell variable SIMPATH to the installation directory

    export SIMPATH=~/fair_install/FairSoftInst [setenv SIMPATH ~/fair_install/FairSoftInst]

    cd ~/fair_install git clone -b dev https://github.com/FairRootGroup/FairRoot.git cd FairRoot mkdir build cd build cmake -DCMAKE_INSTALL_PREFIX="~/fair_install/FairRootInst" .. make make install ```

    To run the tests do:


    To run test: make new shell, do not define SIMPATH

    cd ~/fair_install/FairRoot/build make test ```

  3. Install the template:

    you need to copy the project template to you own directory


    Set the shell variable FAIRROOTPATH to the FairRoot installation directory

    export FAIRROOTPATH=~/fair_install/FairRootInst [setenv FAIRROOTPATH ~/fair_install/FairRootInst]

    cd ~/fair_install cp -rf FairRoot/templates/project_template MyTest cd MyTest ./rename.sh MyExperiment PREFIX MyDetector

Please call the script with three parameters. The first one is the

name of the project. The second one is the prefix in front of

the class names. and some directories. So this second parameter

shouldn't be to long. The third parameter is the name of the

detector you want to implement.

As an example the if you want to create a project for the Panda

experiment and you want to implement a Straw Tube Tracker (stt)

you would call the script in the following way.

./rename.sh Panda Pnd stt

cd .. mkdir build cd build cmake ../MyExperiment make . config.sh [or source config.csh] ```

Now you can for example simulate some events and run the event display:

```bash root -q ../MyExperiment/macro/run_sim.C root ../MyExperiment/macro/eventDisplay.C // Click on "FairEventManager" (in the top-left pane) // Click on the "Info" tab (on top of the bottom-left pane) // Increase the "Current Event" to >0 to see the events root [1] .q ```

Generating Doxygen documentation

If the flage -DBUILD_DOXYGEN=ON is set when calling cmake, the doxygen documentation will be generated when calling make. The generated html files can then be found in "build/doxygen/doc/html"

Doxygen documantation is also available online here