The W7-X project: scientific basis and technical realization

Erckmann, V.; Hartfuß, H. J.; Kick, M.; Renner, H.; Sapper, J.; Schauer, F.; Speth, E.; Wesner, F.; Wagner, F.; Wanner, M.; Weller, A.; Wobig, H.

doi:10.1109/fusion.1997.685662

Cited by 40 publications

(34 citation statements)

References 16 publications

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“…Wendelstein 7-X (W7-X) will be the largest stellarator in the world with an average major radius of 5.5 m, an average minor plasma radius of 0.53 m, and a total weight of 725 t. It shall operate at reactor relevant plasma parameters [1]. The first three modules of the magnet system (out of 5) have been successfully completed within schedule and are already installed in the torus hall [2,3].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…W7-X is equipped with a superconducting coil system, a continuously operating ECRH system and an actively pumped divertor for stationary particle and energy control. An ECRH-plant with 10 MW heating power at 140 GHz in CW mode (30 min) is being built to support W7-X operation [1]. The standard heating and current drive scenario is X2-mode (B res =2.5 T) with low field side launch (LFS).…”

Section: Introductionmentioning

confidence: 99%

The W7-X ECRH Plant: Recent Achievements

Erckmann

Brand²,

Braune

et al. 2007

AIP Conference Proceedings

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Abstract. The 10 MW, 140 GHz, CW ECRH-plant for W 7-X is in an advanced state of commissioning and the installation was used to investigate advanced applications for extended heating-and current drive scenarios. The operation of the TED gyrotrons was recently extended to a 2 nd frequency of 103.6 GHz at reduced output power and first results are presented. An improved collector sweep system for the W7-X gyrotrons with enhanced power capability and smooth power distribution was developed, results are reported.

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“…WENDELSTEIN 7-X (W7-X) will be the largest stellarator in the world with an average major radius of 5.5 m, an average minor radius of 0.53 m and a total weight of 725 t. It shall operate at reactor relevant plasma parameters [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of W7-X: Main results and critical issues

Bykov

Schauer

Egorov

et al. 2007

Fusion Engineering and Design

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Abstract-The Wendelstein 7-X (W7-X) stellarator project goal is to demonstrate that the stellarator is a viable option for a fusion power-plant. W7-X is in an advanced state of construction and has entered the assembly phase in at the Max-Planck-Institute für Plasmaphysik (IPP) in Greifswald, Germany.The W7-X "pentagonal" basic magnet system is highly sensitive to parameter variations; the cryostat comprises two vessels, which are interconnected elastically by 299 ports. The strategy of the structural analysis for this complex mechanical system is being developed and implemented with the ultimate goal to create a tree of numerical models which reliably predict the stellarator structural behaviour. This paper gives an overview of the strategy, addresses the critical issues and focuses on the most interesting results of the analyses.

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The W7-X project: scientific basis and technical realization

Cited by 40 publications

References 16 publications

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

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

The W7-X ECRH Plant: Recent Achievements

Structural analysis of W7-X: Main results and critical issues

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