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Publications (4)1.2 Total impact

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    ABSTRACT: The superconducting magnet system of the Wendelstein 7-X (W7-X) stellarator experiment consists of 50 non-planar and 20 planar coils which are supported by the central support structure and inter-coil structure elements. This highly loaded support system is prone to mechanical disturbances like stick-slip effects. On the other hand, the coils are built up from cable-in-conduit-conductors (CICC) whose strands are highly compressed by Lorentz forces during operation. Residual elastic energy release within a cable can be triggered by shock waves and corresponding frictional heat generation may occur. The released energy might come into the order of the conductor stability limit and possibly cause a quench. An experiment was performed to simulate the impact of such mechanical disturbances on W7-X coils with stability margins corresponding to different operation conditions. A non-planar coil installed within the magnet test facility was energized and then hit by a pendulum via a stainless steel transfer rod. The test has shown that mechanical disturbances expected in W7-X are not able to induce a quench in any of the foreseen W7-X operation scenarios.
    IEEE Transactions on Applied Superconductivity 07/2010; · 1.20 Impact Factor
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    ABSTRACT: The goal of the Wendelstein 7-X (W7-X) stellarator project is to demonstrate that this type of machine is a viable option for a fusion power-plant. At present the W7-X experiment is in the assembly phase at the Max-Planck-Institut for plasma physics in Greifswald, Germany. The reliable prediction of the structural behavior of the W7-X machine is only possible by employing complex finite element (FE) analyses with a hierarchical set of FE models. A special strategy has been developed for the structural analysis which is under implementation now. This paper gives an overview of the analysis strategy, the applied structural criteria and critical issues, and focuses on the most remarkable results. The main attention is paid to the components that have been changed or optimized recently.
    Fusion Engineering, 2007. SOFE 2007. 2007 IEEE 22nd Symposium on; 07/2007
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    ABSTRACT: The Wendelstein 7-X stellarator is presently under construction and assembly in Greifswald, Germany. Its ultimate goal is to verify that such stellarator magnetic confinement concept is a viable option for a demonstration fusion power-plant. The superconducting magnet system, capable to generate a average magnetic field up to 3 Tesla at the magnetic axis, is basically composed of non-planar and planar coils, and of a central support structure to which they are connected. This system is a complex mechanical structure which has to fulfil demanding requirements in terms of accuracy of the magnetic field, capability to take the operational loads, suitability of the manufacturing tolerances and assembly scheme, interfaces. The magnet system is interconnected by support elements which have been conceived and designed in such a way to react to the loads in a "balanced way", while complying with the other requirements mentioned above. Given the unprecedented complexity of such mechanical scheme, an integrated programme of design, FE analyses, tests, assembly trials has been undertaken. This paper gives an overview of the way this structure is conceived, of its key support elements, and of the results of the analyses and tests carried out so far
    01/2005;
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    ABSTRACT: The Wendelstein 7-X stellarator is presently under construction and assembly in Greifswald, Germany. Its ultimate goal is to verify that such stellarator magnetic confinement concept is a viable option for a demonstration fusion power-plant. The superconducting magnet system, capable to generate a average magnetic field up to 3 Tesla at the magnetic axis, is basically composed of non-planar and planar coils, and of a central support structure to which they are connected. This system is a complex mechanical structure which has to fulfil demanding requirements in terms of accuracy of the magnetic field, capability to take the operational loads, suitability of the manufacturing tolerances and assembly scheme, interfaces. The magnet system is interconnected by support elements which have been conceived and designed in such a way to react to the loads in a "balanced way", while complying with the other requirements mentioned above. Given the unprecedented complexity of such mechanical scheme, an integrated programme of design, FE analyses, tests, assembly trials has been undertaken. This paper gives an overview of the way this structure is conceived, of its key support elements, and of the results of the analyses and tests carried out so far
    Fusion Engineering 2005, Twenty-First IEEE/NPS Symposium on; 01/2005