Output

Output directory

Per default, the selected output files will be saved in the directory ./data/<run_id>, where <run_id> is an integer number starting from 0. At the beginning of a run SMASH checks, if the ./data/0 directory exists. If it does not exist, it is created and all output files are written there. If the directory already exists, SMASH tries for ./data/1, ./data/2 and so on until it finds a free number.

The user can change output directory by a command line option, if desired:

smash -o <user_output_dir> 

Output content

Output in SMASH is distinguished by content and format, where content means the physical information contained in the output (e.g. list of particles, list of interactions, thermodynamics, etc) and format (e.g. Oscar, binary or ROOT). The same content can be printed out in several formats simultaneously.

For an example of choosing specific output contents see Output Configuration.

The list of possible contents follows:

• Particles List of particles at regular time intervals in the computational frame or (optionally) only at the event end.
  • Available formats: OSCAR Particles Format, Binary Format, ROOT Format, VTK Format
• Collisions List of interactions: collisions, decays, box wall crossings and forced thermalizations. Information about incoming, outgoing particles and the interaction itself is printed out.
  • Available formats: OSCAR Collisions Format, Binary Format, ROOT Format
• Dileptons Special dilepton output, see Dileptons.
  • Available formats: OSCAR Collisions Format, Binary Format and ROOT Format
• Photons Special photon output, see Photons.
  • Available formats: OSCAR Collisions Format, Binary Format and ROOT Format.
• Thermodynamics This output allows to print out thermodynamic quantities, see Thermodynamics.
  • Available formats: ASCII Thermodynamics Output, Thermodynamics VTK Output
• Initial_Conditions Special initial conditions output, see Initial Conditions for details
  • Available formats: OSCAR Particles Format, ASCII IC Output
• HepMC List of intial and final particles in HepMC3 event record, see HepMC Output for details
  • Available formats: ASCII HepMC Format

Output formats

For choosing output formats see Output Configuration. Every output content can be printed out in several formats:

• "Oscar1999", "Oscar2013" - human-readable text output
  
  • For "Particles" content: OSCAR Particles Format
  • For "Collisions" content: OSCAR Collisions Format
  • General block structure of OSCAR formats: OSCAR Block Structure
• "Binary" - binary, not human-readable output
  • Faster to read and write than text outputs
  • Saves coordinates and momenta with the full double precision
  • General file structure is similar to OSCAR Block Structure
  • Detailed description: Binary Format
• "Root" - binary output in the format used by ROOT software (http://root.cern.ch)
  • Even faster to read and write, requires less disk space
  • Format description: ROOT Format
• "VTK" - text output suitable for an easy visualization using paraview software
  • This output can be opened by paraview to see the visulalization.
  • For "Particles" content VTK Format
  • For "Thermodynamics" content Thermodynamics VTK Output
• "ASCII" - a human-readable text-format table of values
  • Used for "Thermodynamics", "Initial_Conditions" and "HepMC", see ASCII Thermodynamics Output ASCII IC Output HepMC Output

Note

Output of coordinates for the "Collisions" content in the periodic box has a feature: Collision Output in Box Modus