Verification tests of critical bolted connections of the W7-X coils

Dudek, Andrzej; Bykov, V.; Czarkowski, P.; Hathiramani, D.; Nitz, Marco; Schauer, F.; Klammer, Jesko; Zauner, Christof; Damiani, Carlo

doi:10.1016/j.fusengdes.2008.11.032

Cited by 10 publications

(14 citation statements)

References 2 publications

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“…All critical support elements have been tested, using adequate mock-ups, and benchmarked with local FE models [26,32,33,34]. A special conservative analysis procedure, taking into account the structural material degradation at 4K in the form of serration effects, has been developed and implemented to accept local plastification in the support elements [35,36,37].…”

Section: Structural Stability Of the Superconducting Coil Systemmentioning

confidence: 99%

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Bosch¹,

Wolf²,

Andreeva³

et al. 2013

Nucl. Fusion

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The next step in the Wendelstein stellarator line is the large superconducting device Wendelstein 7-X, currently under construction in Greifswald, Germany. Steady-state operation is an intrinsic feature of stellarators, and one key element of the Wendelstein 7-X mission is to demonstrate steady-state operation under plasma conditions relevant for a fusion power plant. Steady-state operation of a fusion device, on the one hand, requires the implementation of special technologies, giving rise to technical challenges during the design, fabrication and assembly of such a device. On the other hand, also the physics development of steady-state operation at high plasma performance poses a challenge and careful preparation. The electron cyclotron resonance heating system, diagnostics, experiment control and data acquisition are prepared for plasma operation lasting 30 min. This requires many new technological approaches for plasma heating and diagnostics as well as new concepts for experiment control and data acquisition.

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Section: Structural Stability Of the Superconducting Coil Systemmentioning

confidence: 99%

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Bosch¹,

Wolf²,

Andreeva³

et al. 2013

Nucl. Fusion

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“…Worth to mention are particularly test programs supported by intensive structural analysis for highly loaded NSEs [13,14], CSEs [15], cryolegs [16] and conductor connections [17], as well as for the mechanical quench test on the superconducting NPC type 2 under current [27,28].…”

Section: 3mentioning

confidence: 99%

Structural analysis of W7-X: From design to assembly and operation

Bykov

Schauer

Egorov

et al. 2011

Fusion Engineering and Design

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Abstract-The Wendelstein 7-X (W7-X) modular stellarator is in the assembly phase at the Max-Planck-Institut für Plasmaphysik in Greifswald, Germany. The design of the "basic machine", i.e. without in-vessel components, diagnostics and periphery, is largely completed, structural parameters such as bolt preload, initial conditions for contact elements, etc. are defined, and most of the components are manufactured and partly assembled. Therefore, the focus of structural analysis was shifted towards fast analyses of nonconformities, changes in the assembly procedure, and exploration of operational limits. Assembly-related work is expected to continue until commissioning of the machine, however, with decreasing intensity. In parallel the analysis requirements for in-vessel components, diagnostics and periphery will increase. This paper focuses on the most remarkable results, on special problems which had to be solved, on strategic issues like parameterization, complex finite element model structuring and benchmarking with alternative models in different codes, on assumptions of reasonable safety margins and expected tolerances, and on confirmation of analysis results by tests. Finally it highlights some lessons learned so far, which might be relevant also for other large fusion machines, and gives an outlook on future work.

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“…The cross-sectional forces and moments gained through global analysis were used for these additional analyses [16][17][18][19][20].…”

Section: Cross-sectional Loadsmentioning

confidence: 99%

Analysis of the magnet support structure for the plasma fusion experiment Wendelstein 7-X

Jakšić

Eeten

Bykov

et al. 2011

Computers & Structures

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a b s t r a c tThe world's largest plasma fusion experimental device of the stellarator family named Wendelstein 7-X (W7-X) [http://www.ipp.mpg.de/ippcms/eng/for/projekte/w7x/index.html] is being built at the MaxPlanck-Institute for Plasma Physics (IPP) in Greifswald, Germany. The mission of the experiment is to prove the fusion reactor relevance of the stellarator principle [1,2].Main subject of this paper is the description of the numerical simulation of the highly complex and multiple nonlinear W7-X magnet system structure with the code ADINA. This code was chosen right from the start of the project and has later been used in parallel with the subsequently installed ANSYS and ABAQUS codes until now.The ADINA W7-X global structure model is the result of a long term R&D work on the superconducting coils and related support structure optimization. Despite the fact that W7-X is already in the assembly phase, there are still large structural analysis efforts going on. Their aim is to accompany the machine construction by evaluating specific assembly issues, non-conformities and design changes, but also to evaluate the operational limits of the experimental device which in many respects is an absolute prototype worldwide.

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Verification tests of critical bolted connections of the W7-X coils

Cited by 10 publications

References 2 publications

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Structural analysis of W7-X: From design to assembly and operation

Analysis of the magnet support structure for the plasma fusion experiment Wendelstein 7-X

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