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"IMAS database and IDS data structures, or how ITER people want us to store tokamak data", dr Grzegorz Pełka, IFPiLM

Link do spotkania w aplikacji Microsoft Teams: https://tiny.pl/dwlk6

 

Abstract

The practice of giving people files with sequences of mysteriously ordered numbers must be stopped. Each machine or code cannot be a completely new world to discover. Someone influential must enforce some kind of order. IMAS database system is an ITER-backed initiative aimed at establishing a common framework for tokamak (or even all MFC devices) data storage and exchange. The data present itself to the user as leaves of a multibranched tree build according to so called IDS structure. The structure is still growing to accommodate various data types requested by the users (both experimentalists and modellers). Naturally, most of the branches are going empty. Which one depends on a particular diagnostics or code considered. A common file browser is provided; so, viewing data is trivial (but can be tedious - an expected feature of general purpose tools). The data manipulation needs dedicated software that either grow leaves on selected branches of the IDS tree or reads them. The routines in major programming languages (Fortran, C, Python...) to store the tree in a file in the database or retrieve it are provided. Needless to say, this IT hocus-pocus is not going to solve for us real-life data issues of compatibility of of data creators and users expectations. Still interpolation / extrapolation / transformation tools are going to be needed, but writing then will be easier. Anyway, chances are, everybody in MCF field will sooner or later need to work with IMAS, I try to urge there is nothing to fear.

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Research projects carried out at the IPPLM are funded by the Polish Ministry of Education and Science, the National Science Centre and by the European Commission within the framework of EUROfusion Consortium under grant agreement No 633053. Financial support comes also from the International Atomic Energy Agency, European Space Agency and LaserLab Consortium as well as from the Fusion for Energy Agency.

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