Output data from simplified electromagnetic models for structure analysis of main ITER components

Rozov, V.; Alekseev, A.; Gribov, Y.; Roccella, M.; Roccella, R.; Sannazzaro, G.; Sugihara, M.

doi:10.1016/j.fusengdes.2012.11.002

Cited by 2 publications

(2 citation statements)

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“…The use of pre-computed matrices permits real-time calculations, and such functionality can be integrated with the operational diagnostic and control systems of the real machine. Specific questions, concerning: EM loads on blanket, EM loads on VV, use of dynamic simulators, hybrid/multi-scale modeling of EM problems, representation of results and distributed data, and general strategy and approach were considered separately in [9][10][11].…”

Section: Discussionmentioning

confidence: 99%

“…The consideration of the 3D EM problem in terms of integral values converts it into a problem with discrete parameters-a conventional scheme, providing a possibility of straightforward definition of the necessary controller. The synthesis of minimized equivalent dynamic systems (simulators) specifically for a few parameters of interest (subject to the assessment in the majority of practical tasks) provides another way of optimization [9].…”

Section: Computational and Practical Aspects Special Casesmentioning

confidence: 99%

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Hybrid integral-differential simulator of EM force interactions/scenario-assessment tool with pre-computed influence matrix in applications to ITER

Rozov¹,

Alekseev²

2015

Nucl. Fusion

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A necessity to address a wide spectrum of engineering problems in ITER determined the need for efficient tools for modeling of the magnetic environment and force interactions between the main components of the magnet system. The assessment of the operating window for the machine, determined by the electro-magnetic (EM) forces, and the check of feasibility of particular scenarios play an important role for ensuring the safety of exploitation. Such analysis-powered prevention of damages forms an element of the Machine Operations and Investment Protection strategy. The corresponding analysis is a necessary step in preparation of the commissioning, which finalizes the construction phase. It shall be supported by the development of the efficient and robust simulators and multi-physics/multi-system integration of models. The developed numerical model of interactions in the ITER magnetic system, based on the use of pre-computed influence matrices, facilitated immediate and complete assessment and systematic specification of EM loads on magnets in all foreseen operating regimes, their maximum values, envelopes and the most critical scenarios. The common principles of interaction in typical bilateral configurations have been generalized for asymmetry conditions, inspired by the plasma and by the hardware, including asymmetric plasma event and magnetic system fault cases. The specification of loads is supported by the technology of functional approximation of nodal and distributed data by continuous patterns/analytical interpolants. The global model of interactions together with the mesh-independent analytical format of output provides the source of self-consistent and transferable data on the spatial distribution of the system of forces for assessments of structural performance of the components, assemblies and supporting structures. The numerical model used is fully parametrized, which makes it very suitable for multi-variant and sensitivity studies (positioning, off-normal events, asymmetry, etc). The obtained results and matrices form a basis for a relatively simple and robust force processor as a specialized module of a global simulator for diagnostic, operational instrumentation, monitoring and control, as well as a scenario assessment tool. This paper gives an overview of the model, applied technique, assessed problems and obtained qualitative and quantitative results.

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Section: Discussionmentioning

confidence: 99%

Section: Computational and Practical Aspects Special Casesmentioning

confidence: 99%