Structural analysis of W7-X: Overview

Bykov, V.; Schauer, F.; Egorov, K.; Tereshchenko, A.; Eeten, P. van; Dübner, A.; Sochor, M.; Zacharias, D.; Dudek, Andrzej; Chen, W.; Czarkowski, P.; Sonnerup, L.; Fellinger, J.; Hathiramani, D.; Ye, M. Y.; Dänner, W.; Team, W X

doi:10.1016/j.fusengdes.2008.12.113

Cited by 31 publications

(28 citation statements)

References 16 publications

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“…Before torus assembly, the asymmetry had already been assessed with an independent 360° FE model in Ansys, which was created by five time multiplication of the default Ansys model of one module [3]. The model does not include the machine base.…”

Section: Resultsmentioning

confidence: 99%

“…Starting point was the existing 72° model of one module in Abaqus v6.11 [3]. This model was multiplied 5 times to obtain a full 360° model.…”

Section: Fe Modelingmentioning

confidence: 99%

“…The final simulation steps are given in table 3. Element activation to connect modules is done in step 5-11 according to assembly.…”

Section: Cryoleg Temporary Supportsmentioning

confidence: 99%

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Asymmetry of W7-X magnet system introduced by torus assembly

Fellinger

Egorov

Kallmeyer

et al. 2014

Fusion Engineering and Design

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The magnet system of the stellerator Wendelstein 7-X (W7-X) consists of 5 modules of 14 superconducting coils with complex 3D shape each. After manufacturing the coils and assembly of the modules on temporary stands, the position of each module on the machine base was successfully optimized to minimize the electromagnetic (EM) field asymmetry. This asymmetry originates from inevitable geometric deviations of the coils from the target shape due to manufacturing and assembly tolerances.However, new deviations were introduced after module optimization due to bolting the modules of the magnet system together to a torus, removing temporary supports and further loading of the machine base with weight of additional components.In this paper, the geometrical deviations along the centre line of the coil currents are assessed through detailed step-by-step non-linear finite element (FE) simulation of the assembly procedure of the complete torus. The model is evaluated against measured displacements and reaction forces monitored during consequent assembly steps. The results are being used to quantify the obtained field asymmetry and countermeasures to minimize it.

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Section: Resultsmentioning

confidence: 99%

“…Starting point was the existing 72° model of one module in Abaqus v6.11 [3]. This model was multiplied 5 times to obtain a full 360° model.…”

Section: Fe Modelingmentioning

confidence: 99%

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Asymmetry of W7-X magnet system introduced by torus assembly

Fellinger

Egorov

Kallmeyer

et al. 2014

Fusion Engineering and Design

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“…Therefore, at full current, the assurance of the mechanical integrity of the central support structure (CSS), coil casings and the inter-coil support system posed a big challenge. This was investigated in detail by finite-element (FE) calculations [21,22] and a solution was found, consisting of a complex system of different support elements.…”

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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“…In the past, two global models (GMs) of the 36° submodule and 72° module, elastic in material, have been developed with the ABAQUS code by L.T.Calcoli and IPP [4]: in these GMs also the NSEs have been included with a relatively coarse mesh to simulate the contact interaction between the NPCs.…”

Section: Introductionmentioning

confidence: 99%

Limit analysis of narrow support elements in W7-X considering the serration effect of the stress–strain relation at 4 K

Briani

Gianini

Lucca

et al. 2011

Fusion Engineering and Design

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The magnet support system of the Wendelstein 7-X (W7-X) fusion stellarator includes challenging components, called Narrow Support Elements (NSEs), placed between the Non Planar Coils (NPCs) at the inboard side and aimed at reducing deformation of the coils. NSEs are small contact elements, with special coating to reduce friction, that have to withstand high compressive and shear forces. The objective of this article is to demonstrate the structural reliability of the NSEs under electromagnetic loading (EML), taking into account in a conservative way the relevant material properties at cryogenic temperatures. To this purpose, an appropriate parametric local Finite Element (FE) model of one highly loaded NSE with its components (pad, pad frame and counter pad) and of a portion of the coils has been developed with ABAQUS code and isotropic elastic-plastic material model with hardening/softening has been used, in order to include the serration effect at 4K. Different mechanical limit analyses have been performed including consecutive steps of shrink fitting the NSEs in the coils, cooling down to 4K and gradual increasing of the coil displacements induced by the EML.

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Structural analysis of W7-X: Overview

Cited by 31 publications

References 16 publications

Asymmetry of W7-X magnet system introduced by torus assembly

Asymmetry of W7-X magnet system introduced by torus assembly

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

Limit analysis of narrow support elements in W7-X considering the serration effect of the stress–strain relation at 4 K

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