IMAS Data Dictionary documentation

Contents
Contents
- Introduction
- Glossary
  Glossary
  - Data types
  - Coordinates and time handling
  - Units
  - Quantities with error bars
  - Non-backwards compatible changes
  - Identifiers
  - Coordinate conventions Coordinate conventions
    Table of contents
    
    COCOS
    
    Cylindrical coordinate convention
- IDS migration guide
Advanced search
Advanced search
- Query tool
Data dictionary reference
Data dictionary reference
GGD guide
GGD guide
- Introduction to the GGD structure
- Examples
Developer documentation
Developer documentation
- DD developer documentation

Coordinate conventions¶

COCOS¶

This version of the IMAS Data Dictionary corresponds to COCOS = 17 coordinate convention.

Caution

Major version 4 corresponds to COCOS = 17, while major version 3 corresponds to COCOS = 11.

The COCOS (Coordinate COnvetionS for 3D current and magnetic fields) conventions are described in detail in: O. Sauter and S.Yu. Medvedev, Computer Physics Communications 184 (2013) 293.

More information is also available on the web page of O. Sauter.

Cylindrical coordinate convention¶

For conversion between cylindrical \((R,\phi,Z)\) and Cartesian \((X,Y,Z)\) coordinates, IMAS follows the ISO 31-11 standard: the origin and Z axis align and the X axis corresponds to \(\phi=0\).