Since 18 of December 2019 uses Nucleus credentials. Visit our help pages for information on how to Register and Sign-in using Nucleus.
13-17 May 2019
Daejeon, Republic of Korea
Europe/Vienna timezone
Meeting Material is now available and accessible from the left-menu

W7-X Logbook REST API for processing metadata and experiment data enrichment at the Wendelstein 7-X stellarator

15 May 2019, 15:25
2h 35m
Daejeon, Republic of Korea

Daejeon, Republic of Korea

Board: P/3-8
Poster Database Techniques for Information Storage and Retrieval Poster


Michael Grahl (Max Planck Institut für Plasmaphysik)


Wendelstein 7-X (W7-X) is a stellarator experiment located in Greifswald, Germany. In the first operational phases (OPs), the W7-X team has been already working on a variety of research topics with about 40 diagnostic systems in operation. In these OPs, many plasma discharges (50 per day/1000 per OP) with durations of up to 100 s were conducted, producing about 500 terabyte of experiment data. For demonstrating steady-state operation, longer experiment durations of up to 30 min are planned for upcoming OPs. Therefore, a large flexibility is needed to satisfy the different use cases and requirements of such an experimental environment, esp. for data processing and analysis.

For this reason, several essential functions for W7-X research are available as web services. The services can easily be combined and integrated into other software due to the usage of standard protocols and common web techniques, such as representational state transfer application programming interfaces (REST APIs). A new central logbook was implemented for working with W7-X experiment metadata via web browser and REST API. Since its introduction, many enhancements have been implemented according to user feedback. For effective research and processing of experiment data, the bulk data of W7-X experiments can be enriched with additional information, such as comments and tags for categorizing. For W7-X experiments, a majority of metadata is extracted automatically from the planned program by the central control software, while the team members complete these logs manually or via software. The logbook also provides search functionality with a powerful search syntax and millisecond response times. By using the REST API, users can integrate logbook searches into their own software and programmatically add new comments or tags. In combination with other W7-X web services, such as a magnetic coil database or the experiment data archive, additional W7-X resources can be utilized for the creation of new tags and further metadata. In this way, all team members were able to contribute to the creation of comprehensive experiment overviews. The logbook quickly became a crucial tool for W7-X operation and is now considered a central hub for experiment related information.

This contribution shows the principles and usage of the W7-X logbook REST API for data enrichment in combination with other W7-X web services and applications.

Primary author

Michael Grahl (Max Planck Institut für Plasmaphysik)


Dr Anett Spring (Max Planck Institut für Plasmaphysik) Tamara Andreeva (Max-Planck-Institut für Plasmaphysik, Teilinstitut Greifswald, Germany) Mr Torsten Bluhm (Max Planck Institut für Plasmaphysik) Sergey Bozhenkov (Max-Planck-Institut für Plasmaphysik, Greifswald, Germany) Mr Simon Dumke (Max Planck Institut für Plasmaphysik) Joachim Geiger (Max-Planck-Institute for Plasma Physics, Greifswald, Germany) Olaf Grulke (MPI for Plasma Physics) Mr Martin Grün (Max-Planck-Institut für Plasmaphysik) Mr Andreas Holtz (Max-Planck-Institut für Plasmaphysik) Udo Höfel (Max-Planck-Institut für Plasmaphysik) Mrs Heike Laqua (Max Planck Institut für Plasmaphysik) Mr Marc Lewerentz (Max-Planck-Institut für Plasmaphysik) Heike Riemann (Max-Planck-Institut für Plasmaphysik) Jonathan Schilling (Max-Planck-Institut für Plasmaphysik) Dr Adrian von Stechow (Max-Planck-Institut für Plasmaphysik) Dr Jakob Svensson (Max-Planck-Institut für Plasmaphysik) Axel Winter (Max Planck Institut für Plasmaphysik) W7-X Team

Presentation Materials