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

Contextual metadata becomes an important factor for the work with research data, which is created in large amounts at fusion experiments. In its first operational phases, the stellarator experiment Wendelstein 7-X (W7-X) produces about 500 TB of experimental data in only a few weeks of scientific campaign. A new central logbook software was implemented for the processing of contextual metadata at W7-X. The bulk data of W7-X experiments can be enriched with additional information, such as comments and tags for categorizing. Since its introduction, many enhancements have been implemented based on user feedback. This was possible due to a flexible software architecture. By using the logbook REST API, users can integrate logbook requests into their own software and programmatically add new content. The logbook quickly became a crucial tool for W7-X operation and is now considered a central hub for all experiment-related information. This paper describes the implementation of the W7-X logbook and the experience with the integration of metadata via REST API.