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Data on Fusion Engineering Described by Researchers at Eindhoven University of Technology (Distributed digital real-time control system for TCV...

July 31, 2014

Data on Fusion Engineering Described by Researchers at Eindhoven University of Technology (Distributed digital real-time control system for TCV tokamak)

By a News Reporter-Staff News Editor at Computer Weekly News -- Researchers detail new data in Fusion Engineering. According to news reporting from Eindhoven, Netherlands, by VerticalNews journalists, research stated, "A new digital feedback control system (named the SCD 'Systeme de Controle Distribue') has been developed, integrated and used successfully to control TCV (Tokamak a Configuration Variable) plasmas. The system is designed to be modular, distributed, and scalable, accommodating hundreds of diagnostic inputs and actuator outputs."

The news correspondents obtained a quote from the research from the Eindhoven University of Technology, "With many more inputs and outputs available than previously possible, it offers the possibility to design advanced control algorithms with better knowledge of the plasma state and to coherently control all TCV actuators, including poloidal field (PF) coils, gas valves, the gyrotron powers and launcher angles of the electron cyclotron heating and current drive system (ECRH/ECCD) together with diagnostic triggering signals. The system consists of multiple nodes; each is a customised Linux desktop or embedded PC which may have local ADC and DAC cards. Each node is also connected to a memory network (reflective memory) providing a reliable, deterministic method of sharing memory between all nodes. Control algorithms are programmed as block diagrams in Matlab-Simulink providing a powerful environment for modelling and control design. The C code is generated automatically from the Simulink block diagram and compiled, with the Simulink Embedded Coder (SEC, formerly Real-Time Workshop Embedded Coder), into a Linux shared library ('.so' file) and distributed to target nodes in the discharge preparation phase. During the TCV discharge, an application on each node is executed that dynamically loads the shared library at runtime. In order to obtain reliable and reproducible real time execution of the algorithm, all interrupts to the CPU on each node are suspended just before firing the shot and re-enabled afterwards. Since installation, the new digital control system has been used for a multitude of plasma control applications, ranging from basic experiments of coil current and density control to advanced experiments of MHD (magnetohydrodynamics) and plasma profile control, as well as real-time plasma transport simulations. Recently, a real-time version of a plasma equilibrium reconstruction code was developed and implemented, providing the future possibility to control the plasma shape and profiles directly during the discharge evolution."

According to the news reporters, the research concluded: "This paper presents the architecture of the new control system, its integration into the TCV plant and a sample of control applications used for TCV plasma discharges."

For more information on this research see: Distributed digital real-time control system for TCV tokamak. Fusion Engineering and Design, 2014;89(3):155-164. Fusion Engineering and Design can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier -; Fusion Engineering and Design -

Our news journalists report that additional information may be obtained by contacting H.B. Le, Eindhoven University of Technology, NL-5600 MB Eindhoven, Netherlands. Additional authors for this research include F. Felici, J.I. Paley, B.P. Duval, J.A. Moret, S. Coda, O. Sauter, D. Fasel and P. Marmillod.

Keywords for this news article include: Eindhoven, Netherlands, Europe, Computers, Fusion Engineering, Linux, Software

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Source: Computer Weekly News

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