Final design of the DTT Toroidal power supply circuit

Zito, Pietro; Manganelli, Matteo; Lampasi, Alessandro; Pipolo, S.; Lopes, R.C.

doi:10.1016/j.fusengdes.2023.113595

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The FDU is modeled as the parallel of the dumper and an ideal switch, normally closed; when the fast discharge is triggered, the switch is opened, forcing the current to flow through the dumper. Meanwhile, the power supply, modeled as an ideal current generator (forcing the nominal current of 42.5 kA in DTT [13]) taken from the Modelica Standard Library [7], is disconnected from the circuit so that the current in the loop decreases. The FDU dumper is composed of a collection of varistor disks [12], modeled here as an equivalent single disk whose characteristic is described by the following equation:…”

Section: Electrical Modelmentioning

confidence: 99%

Application of the Polynomial Chaos Expansion to the Uncertainty Propagation in Fault Transients in Nuclear Fusion Reactors: DTT TF Fast Current Discharge

De Bastiani,

Aimetta,

Bonifetto

et al. 2024

Applied Sciences

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Nuclear fusion reactors are composed of several complex components whose behavior may be not certain a priori. This uncertainty may have a significant impact on the evolution of fault transients in the machine, causing unexpected damage to its components. For this reason, a suitable method for the uncertainty propagation during those transients is required. The Monte Carlo method would be the reference option, but it is, in most of the cases, not applicable due to the large number of required, repeated simulations. In this context, the Polynomial Chaos Expansion has been considered as a valuable alternative. It allows us to create a surrogate model of the original one in terms of orthogonal polynomials. Then, the uncertainty quantification is performed repeatedly, relying on this much simpler and faster model. Using the fast current discharge in the Divertor Tokamak Test Toroidal Field (DTT TF) coils as a reference scenario, the following method has been applied: the uncertainty on the parameters of the Fast Discharge Unit (FDU) varistor disks is propagated to the simulated electrical and electromagnetic relevant effects. Eventually, two worst-case scenarios are analyzed from a thermal–hydraulic point of view with the 4C code, simulating a fast current discharge as a consequence of a coil quench. It has been demonstrated that the uncertainty on the inputs (varistor parameters) strongly propagates, leading to a wide range of possible scenarios in the case of accidental transients. This result underlines the necessity of taking into account and propagating all possible uncertainties in the design of a fusion reactor according to the Best Estimate Plus Uncertainty approach. The uncertainty propagation from input data to electrical, electromagnetic, and thermal hydraulic results, using surrogate models, is the first of its kind in the field of the modeling of superconducting magnets for nuclear fusion applications.

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Section: Electrical Modelmentioning

confidence: 99%

Application of the Polynomial Chaos Expansion to the Uncertainty Propagation in Fault Transients in Nuclear Fusion Reactors: DTT TF Fast Current Discharge

De Bastiani,

Aimetta,

Bonifetto

et al. 2024

Applied Sciences

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“…This energy is dangerous for the safety of the tokamak and must be extracted quickly in the event of a quench in superconductors or a failure in other systems such as the cryogenic system. FDUs are protection systems for the safe and fast dissipation of this energy [17,18].…”

Section: Tfc Power Supplymentioning

confidence: 99%

Analysis for the Integration of the Toroidal Field Power Supply in the DTT Nuclear Fusion Facility

Benedetti,

Lampasi,

Pipolo

et al. 2023

2023 AEIT International Annual Conference (AEIT)

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The Divertor Tokamak Test (DTT) is an innovative effort aligned with the European Fusion Road Map. Backed by Enea and EUROfusion, it will be conducted at the Frascati Research Centre. The goal is to glean insights into diverse magnetic setups and components, all of which are based on liquid metals. These findings are crucial for finalizing the design of DEMO (DEMOnstration Power Plant), a pioneering nuclear fusion reactor prototype set to generate electricity for the grid. The study focuses on TFC (Toroidal Field Coils) power supply and introduces a Simulink model for performance simulation, aiding design, and sizing. These coils play a pivotal role in confining the plasma within the vacuum vessel, and thus, their power supply is of utmost importance. The model also assesses power requirements during TFC charging, offering valuable insights into power factor control methods.

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Characterisation of SiC Varistors at Ambient and Elevated Temperatures for Protection of Superconducting Magnets

Galvin,

Lampasi,

Zito

et al. 2024

IEEE Trans. Appl. Supercond.

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Final design of the DTT Toroidal power supply circuit

Cited by 5 publications

References 13 publications

Application of the Polynomial Chaos Expansion to the Uncertainty Propagation in Fault Transients in Nuclear Fusion Reactors: DTT TF Fast Current Discharge

Application of the Polynomial Chaos Expansion to the Uncertainty Propagation in Fault Transients in Nuclear Fusion Reactors: DTT TF Fast Current Discharge

Analysis for the Integration of the Toroidal Field Power Supply in the DTT Nuclear Fusion Facility

Characterisation of SiC Varistors at Ambient and Elevated Temperatures for Protection of Superconducting Magnets

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