Multi-scenario evaluation and specification of electromagnetic loads on ITER vacuum vessel

Rozov, V.; Martinez, Jean-Marc; Portafaix, C.; Sannazzaro, G.

doi:10.1016/j.fusengdes.2014.03.003

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…There is no applied voltage in the filamented walls, while the voltages in the active poloidal coils during disruption are assumed to be fixed at a pre-disruption level. Therefore, only the change in ψ i pl drives the currents in the passive conductors, and ψ i pc drops out from (26). The initial conditions for equations (26) are…”

Section: Numerical Modelmentioning

confidence: 99%

Local and integral forces on the vacuum vessel during thermal quench in the ITER tokamak

Khayrutdinov

Lukash

Pustovitov

2016

Plasma Phys. Control. Fusion

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The forces arising during an early stage of disruption in tokamaks are studied here. The analysis is based on DINA calculations and comparison with recent analytical predictions (Pustovitov 2015 Plasma Phys. Rep. 41 952). One such prediction was that a large radial force on the vacuum vessel wall can be generated by a thermal quench (TQ) alone, even before the plasma current is changed. The numerical results presented here confirm this and provide precise quantitative characteristics. The calculations are performed for the International Thermonuclear Experimental Reactor (ITER) geometry by using the DINA code. It is shown, in particular, that the TQ-produced radial force in ITER can reach ~70 MN. Its poloidal distribution has a peak ~2.8 times larger than the average. The relevant details of physics models are also presented.

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Section: Numerical Modelmentioning

confidence: 99%

Local and integral forces on the vacuum vessel during thermal quench in the ITER tokamak

Khayrutdinov

Lukash

Pustovitov

2016

Plasma Phys. Control. Fusion

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“…The basic principles of interaction in bilateral configurations are common for all currents (source, eddy, halo) and applicable to asymmetric or faulty systems and continuously distributed currents (shells, solids). Thus, the inclusion of the vacuum vessel shells into consideration, supported by the technology of functional approximation of distributed data by the continuous analytical interpolants, and accounting for simple purely geometrical aspects of the problem [10], facilitate immediate assessment of EM loading at asymmetric configurations (the corresponding problem and results fall beyond the scope of this paper).…”

Section: Discussionmentioning

confidence: 99%

“…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 assessments of the absolute values of loads on structural components have been performed for the pre-defined design load cases and scenarios, using the available currents, provided by DINA plasma simulations, and the developed subsidiary simulators (for poloidal eddy in the VV [10], for loads on blanket modules [11]). In the real machine or full-scale simulator, a certain amount of information will actually be obtained directly from diagnostics and control systems (whose input forms an intrinsic part of any controller for currents).…”

Section: Computational and Practical Aspects Special Casesmentioning

confidence: 99%

“…All profiles and totals are given for unit currents, which makes such specification invariant. The distributed data (profiles) are specified through the coefficients of analytical interpolating expressions [10]. This reduces the amount of data to be stored to the limited set of coefficients instead of numerous individual discrete data points, and makes such specification continuous and mesh-independent (transferable).…”

Section: Influence Matrices For the Iter Magnetic System Total And Di...mentioning

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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Disruption-induced poloidal currents in the tokamak wall

Pustovitov

2017

Fusion Engineering and Design

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Multi-scenario evaluation and specification of electromagnetic loads on ITER vacuum vessel

Cited by 8 publications

References 6 publications

Local and integral forces on the vacuum vessel during thermal quench in the ITER tokamak

Local and integral forces on the vacuum vessel during thermal quench in the ITER tokamak

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

Disruption-induced poloidal currents in the tokamak wall

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