Preliminary Design of DEMO PF Coils Based on EU DEMO 2018 Baseline

Kumar, Mithlesh; Sedlák, Kamil; Sarasola, Xabier; Bruzzone, Pierluigi

doi:10.1109/tasc.2020.2970145

Cited by 8 publications

(11 citation statements)

References 11 publications

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“…The 3D electromagnetic model is made of the three main DEMO magnet systems and also includes an equivalent coil for an ideal plasma wire, as shown in Figure 4a,b. The dimensions and positions used to create the magnet domains are taken from [7,8]. The geometry is built entirely in the APDL environment of Ansys software, with a parametric script to rapidly deal with changes in the structures and to split the domain into different component sub-domains to be able to produce a mapped mesh.…”

Section: Electromagnetic Calculation Methodology-ems Sectionmentioning

confidence: 99%

“…In DEMO, shown in Figure 1, the toroidal field configuration is obtained with sixteen D-shaped magnets (TF) [5], the vertical field by six poloidal annular coils (PF) [6,7] and the primary transformer circuit by one central solenoid (CS), formed by a stack of five independent modules [8]. Each magnet system in DEMO includes superconductive coils made of Cable-In-Circuit Conductors (CICC) [9].…”

Section: Demo: the Design And The Rationale Behindmentioning

confidence: 99%

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A Combined Electromagnetic and Mechanical Approach for EU-DEMO Toroidal Field Coils

2022

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The roadmap to fusion electricity of the European scientific program aims at the realization of the future DEMOnstration (DEMO) fusion power plant. In 2020, the pre-concept design phase of DEMO was completed, defining the concept and characteristics of the main magnets and structures of the machine. Sixteen toroidal D-shaped magnets, six poloidal annular coils and a central solenoid constitute the functioning system core. The reactor is subjected to huge mechanical loads, mainly due to the Lorentz force produced by the combination of the high magnetic fields and operative currents. As a consequence, the loading conditions are extremely demanding for the structural components, and it is crucial to complete a comprehensive static and fatigue assessment before proceeding with the next design iteration. This work focuses on the electromagnetic and structural analyses performed on the toroidal field coil system and its support structures to present the methodological approach developed. Exploiting the finite element method, a three-dimensional model has been defined to obtain the electromagnetic loads on the main time points of the reference plasma scenario and then transfer them to a related 3D structural model, corresponding to the discretization of the electromagnetic one. The structural model was used to obtain the displacement and stress fields at the various time points to perform the mechanical evaluation as well as the fatigue assessment.

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Section: Electromagnetic Calculation Methodology-ems Sectionmentioning

confidence: 99%

Section: Demo: the Design And The Rationale Behindmentioning

confidence: 99%

A Combined Electromagnetic and Mechanical Approach for EU-DEMO Toroidal Field Coils

2022

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“…Also the two design options [28,34] of the PF coils have been updated according to the 2018 DEMO reference. It turned out that two of the PF coils, namely PF1 and PF6 cannot be reasonably made of NbTi due to the peak field close to 7 T and requested design T cs exceeding 6 K (a temperature margin of 1.5 K is required on top of the inlet temperature of 4.5 K).…”

Section: Pf Coilsmentioning

confidence: 99%

“…It turned out that two of the PF coils, namely PF1 and PF6 cannot be reasonably made of NbTi due to the peak field close to 7 T and requested design T cs exceeding 6 K (a temperature margin of 1.5 K is required on top of the inlet temperature of 4.5 K). Unless a different operating scenario for the PF coils is found, PF1 and PF6 coils will have to be made of Nb 3 Sn as outlined in [34]. Also in the case of the PF coils the fatigue stress is driving the coil mechanical design.…”

Section: Pf Coilsmentioning

confidence: 99%

Advance in the conceptual design of the European DEMO magnet system

Sedlák

Anvar

Bagrets³

et al. 2020

Supercond. Sci. Technol.

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“…The design proposed by the Swiss Plasma Center (SPC) in 2018 satisfied the 19.6 MA plasma current scenario [3]. In 2019, a preliminary design was proposed for the newly available 17.86 MA plasma current scenario [4]. The design was based on coil currents in three different plasma states: Premagnetisation (PREMAG), Start Of Flattop (SOF), and End Of Flattop (EOF).…”

Section: Introductionmentioning

confidence: 99%

Alternative PF Coil Winding Pack Design for the EU DEMO

Kumar¹,

Guarino²,

Sedlák³

et al. 2021

IEEE Trans. Appl. Supercond.

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The EUROfusion DEMO machine is at its pre-conceptual stage. The design of the magnet system for this machine is being developed in collaboration with several European research centers. The Poloidal Field (PF) coils proposed by the Swiss Plasma Center (SPC) use a multiple-in-hand Pancake winding technique. A design based on updated plasma scenarios (2018) was recently proposed. The Winding Pack (WP) aspect ratio was kept close to one, similar to the baseline design in the EUROfusion 2018 DEMO baseline document.In this publication, we study the effects of changing WP aspect ratio. A vertically elongated WP cross-section is beneficial in the reduction of the peak magnetic field at WP cross-section, the machine radial extent, and the hydraulic lengths. However, it increases the bending stress on the WP. An updated PF design is presented. The dimensioning and allocation of materials is based on 3-dimensional electromagnetic calculations. Mechanical performance is evaluated against both dynamic fatigue stress and static stresses. The static stresses are evaluated through 3-dimensional finite element simulations to take into account also the ripple effect of TF coils and increase in bending stresses due to the elongation of the WP cross-section. The thermal-hydraulic analysis verifies a temperature margin of 1.5 K and confirms sufficient coolant flow for the prescribed pressure drop. The quench analysis determines the hotspot temperatures during various quench scenarios.

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Preliminary Design of DEMO PF Coils Based on EU DEMO 2018 Baseline

Cited by 8 publications

References 11 publications

A Combined Electromagnetic and Mechanical Approach for EU-DEMO Toroidal Field Coils

A Combined Electromagnetic and Mechanical Approach for EU-DEMO Toroidal Field Coils

Advance in the conceptual design of the European DEMO magnet system

Alternative PF Coil Winding Pack Design for the EU DEMO

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