Status report on the development of the data acquisition system of Wendelstein7-X

The increasing number of data acquisition stations and setups in laboratory environments at Wendelstein 7-X already produces a considerable amount of data by now. Diagnosticians want to view the acquired data in a comfortable way and use it for calculations in their own test and analysis algorithms. To prepare for full operation of W7-X a reasonable approach is to provide data access methods that stay as close as possible to the final data access concept. This requires to pay attention for the special needs of W7-X regarding continuously acquired data, segment based parameter switching and time based synchronization of data from different diagnostics. Therefore a data access interface has been designed and implemented considering continuous and steady-state data acquisition as well as usability and performance issues. The interface and its usage in different software environments (e.g. high level scientific programming languages) will be explained. Also the integration of user defined off line analysis algorithms will be described. Additionally the DataBrowser will be presented. The DataBrowser is a java application that can browse continuously acquired data of different kind, provides several types of plots including zooming functions to display the data and the corresponding parameters and offers export functions to save the data locally.

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“…Every item of a sequence is stored along with a 64bit time stamp. [2,3,4] There are three types of streams:…”

Section: Data Organizationmentioning

confidence: 99%

Data access and its implementation at Wendelstein 7-X

Bluhm¹,

Heimann²,

Hennig³

et al. 2008

Fusion Engineering and Design

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“…The Control and Data Acquisition (CoDa) software is described in [1]. Sampled data is time stamped in a TimeGroup, see figure 2.…”

Section: The Control and Data Acquisition Softwarementioning

confidence: 99%

“…Therefore, advanced data acquisition techniques have been developed for continuous acquisition [1]. Not only acquisition of data has to be run continuously, but also online data processing.…”

Section: Introductionmentioning

confidence: 99%

Continuous data acquisition with online analysis for the Wendelstein 7-X magnetic diagnostics

Hennig

Werner

Marquardt

et al. 2008

Fusion Engineering and Design

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The coupling of continuous data acquisition and continuous online analysis keeping up with the acquisition is one of the features the W7-X data acquisition system is designed for. As proof of principle of this concept the magnetic diagnostics have been implemented. The magnetic diagnostics measure time derivatives of the magnetic fluxes and the signals have to be time integrated accordingly. Both measurement and analysis tasks are executed on a single PC based system. The configuration of both hard-and software of the system is presented. Special focuses are the task of software integration of a user supplied online analysis function into the data acquisition system and the incorporation of the complete system into the W7-X segment concept in use by the Control System. The complete installation has been tested at the WEGA Stellarator experiment. Because WEGA is capable of continuous steady state plasma operation the practical suitability of the installation for W7-X could be demonstrated successfully.

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“…(see Refs. [2,3] for more details). Each module has a set of parameters which describes its behavior within a segment.…”

Section: Introductionmentioning

confidence: 99%

From a physics discharge program to device control—Linking the scientific and technical world at Wendelstein 7-X

Riemann

Bluhm

Heimann

et al. 2009

Fusion Engineering and Design

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Status report on the development of the data acquisition system of Wendelstein7-X

Cited by 24 publications

References 8 publications

Data access and its implementation at Wendelstein 7-X

Data access and its implementation at Wendelstein 7-X

Continuous data acquisition with online analysis for the Wendelstein 7-X magnetic diagnostics

From a physics discharge program to device control—Linking the scientific and technical world at Wendelstein 7-X

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