Cutting edge concepts for control and data acquisition for Wendelstein 7-X

Self Cite

After a detailed commissioning process the fusion experiment Wendelstein 7-X (W7-X) was ready to operate in December 2015. The gas supply system and the gas inlet system are two important technical systems of the W7-X device, offering a wide spectrum of functions for plasma vessel conditioning, and plasma operation as well as for diagnostic and calibration purposes. A brief overview is given of the structure of both gas supply and gas inlet systems. The design of the control systems of the gas supply and the gas inlet are introduced and described. The application of the W7-X gas inlet system is explained during an experiment discharge.

Section: B Overview Gas Inlet Systemmentioning

confidence: 99%

The gas supply and gas inlet control systems of the fusion experiment Wendelstein 7-X

Schacht

Brakel

Viebke

et al. 2018

Self Cite

“…Data must be preserved over the lifetime of W7-X. An in depth description of the challenges of W7-X CoDaC can be found in [4].…”

Section: The Wendelstein 7-x Fusion Device and The Codac Systemmentioning

confidence: 99%

Three novel software tools for ASDEX Upgrade

Martinov

Löbhard²,

Lunt

et al. 2016

ArchiveDB is the data archive for all scientific and technical data collected at the Wendelstein 7-X project. It is a distributed system allowing continuous data archival. ArchiveDB has demanding requirements regarding performance efficiency (storage performance of 30 GB/s during experiments, expected storage amount of 1.4 PB/year), reliability (availability of 364 days/year), maintainability (testability) and portability (including change of hardware and software). Data acquisition with continuous operation and high time resolutions (up to nanoseconds scale) for physics data is supported as well as long-term recording up to 24hour/7days for operational data (~1Hz rate). Moreover, all results of data analysis are stored in the archive. Another challenge, uniform retrieval of measured and analyzed data, allowing time and structure information as selection criteria, is mastered as well. The key concepts of data storage and retrieval are: (1) partitioning of incoming data in groups and stream, (2) chunking of data in boxes of manageable size covering a finite time period, and (3) indexing of data using absolute time as ordering and indexing criteria. Continuous operation of the ArchiveDB software and hardware for various systems and components relevant to Wendelstein 7-X has been done successfully for several years, thus, showing that the key requirements are satisfied. The overall data amount so far has reached 7 Terabyte over 9 years of data taking. Round-the-clock operation of the archive is in place since 5 years. Initial plasma operation OP1.1 of Wendelstein 7-X has been supported with no downtime during the whole experimental campaign. The paper describes the software engineering concepts that have been used, consolidated and refined over the years of continuing productive ArchiveDB use and development. Changes in the underlying techniques, e.g. a change of the data store, have been encapsulated via an Application Programming Interface (API). This API unifies different implementations and is also suitable for data migration.

“…Control, Data acquisition and Communication (CoDaC) [12] plays a special role in the commissioning process, as all components have to be controlled (locally) and simultaneously integrated into the central control system. This is an important aspect of the IC, which cannot be tested before.…”

Section: Role Of Codac In W7-x Commissioningmentioning

confidence: 99%

Experience with the commissioning of the superconducting stellarator Wendelstein 7-X

Bosch

Bykov

Brakel

et al. 2015

The super-conducting stellarator Wendelstein 7-X is presently under construction at the Max-Planck-Institute for Plasma Physics in Greifswald, Germany. Assembly of the device is almost completed and the periphery systems and the diagnostic and heating systems are well advanced. Commissioning of the device has been prepared over the last two years and has started in April 2014. This is the first time since decades that a superconducting fusion device is commissioned in Europe.