The development of an integrator for magnetic diagnostics becomes more important as the pulse length of fusion devices gets longer and longer, especially for present-day superconducting fusion devices. A small offset in the signal can cause a significant drift in the integrator output for long pulse experiments. A lock-in amplifying digital integrator has been developed for Wendelstein 7-X (W7-X). It succeeds in suppressing the drift to a low value but requires about 100 ms for data processing. To shorten the data processing time, a Field Programmable Gate Array (FPGA) built in the digitizer is utilized. Since there is no need to transfer the data to an external computer, the integration can be done in real time. The microprocessor built in the digitizer directly transfers the data integrated in the internal FPGA into the reflective memory installed in the same compact Peripheral Component Interconnect chassis. These features result in a very compact system design. The design and the preliminary results of the digital integrator will be presented.

This contribution gives an overview of the project "Prototype W7-X control system". The objective of this prototype project is to demonstrate the applicability of the segment orientated control system at a running fusion experiment including steady state operation, interaction of all relevant components, real time control, data acquisition and on-line data analysis.Furthermore, the W7-X safety concept will be implemented at WEGA and tested.The project was started in October 2006 and will be finished in March 2010.After a short description of the stellarator WEGA the project organization, the implementation of the new W7-X like control system, and first tests results will be discussed. An outlook summarizes the next steps planned for project phase II.

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.