Overview of Progress on the EU DEMO Reactor Magnet System Design

Zani, L.; Bayer, Christoph M.; Biancolini, Marco Evangelos; Bonifetto, Roberto; Bruzzone, Pierluigi; Brutti, C.; Ciazynski, D.; Coleman, M.; Ďuran, I.; Eisterer, M.; Fietz, W.H.; Gade, P. V.; Gaio, E.; Giorgetti, F.; Goldacker, W.; Gömöry, Fedor; Granados, X.; Heller, R.; Hertout, P.; Hoa, C.; Kario, A.; Lacroix, Benoît; Lewandowska, Monika; Maistrello, A.; Muzzi, L.; Nijhuis, A.; Nunio, F.; Panin, A.; Petrișor, T.; Poncet, Jean-Marc; Prokopec, R.; Sanmarti, M.; Savoldi, Laura; Schlachter, S.I.; Sedlák, Kamil; Stepanov, B.; Tiseanu, Ion; Torre, A.; Turtù, S.; Vallcorba, R.; Vojenčiak, M.; Weiss, Klaus-Peter; Wesche, R.; Yagotintsev, K. A.; Zanino, Roberto

doi:10.1109/tasc.2016.2536755

Cited by 51 publications

(28 citation statements)

References 19 publications

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“…The conductor was fixed at the both ends to avoid changes in twist pitch lengths. The 316 L alloy jackets were made with inner dimensions of 11.9×62.1 mm corresponding to the cable dimensions according to the conductor specification [1,6]. The jacket halves of the sample for the AC dipole test were spot welded together with temperature control.…”

Section: Sample Preparation Rw Wp1mentioning

confidence: 99%

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AC loss, interstrand resistance and mechanical properties of prototype EU DEMO TF conductors up to 30 000 load cycles

Yagotintsev

Nijhuis

2018

Supercond. Sci. Technol.

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Two prototype Nb 3 Sn cable-in-conduit conductors conductors were designed and manufactured for the toroidal field (TF) magnet system of the envisaged European DEMO fusion reactor. The AC loss, contact resistance and mechanical properties of two sample conductors were tested in the Twente Cryogenic Cable Press under cyclic load up to 30 000 cycles. Though both conductors were designed to operate at 82 kA in a background magnetic field of 13.6 T, they reflect different approaches with respect to the magnet winding pack assembly. The first approach is based on react and wind technology while the second is the more common wind and react technology. Each conductor was tested first for AC loss in virgin condition without handling. The impact of Lorentz load during magnet operation was simulated using the cable press. In the press each conductor specimen was subjected to transverse cyclic load up to 30 000 cycles in liquid helium bath at 4.2 K. Here a summary of results for AC loss, contact resistance, conductor deformation, mechanical heat production and conductor stiffness evolution during cycling of the load is presented. Both conductors showed similar mechanical behaviour but quite different AC loss. In comparison with previously tested ITER TF conductors, both DEMO TF conductors possess very low contact resistance resulting in high coupling loss. At the same time, load cycling has limited impact on properties of DEMO TF conductors in comparison with ITER TF conductors.

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Section: Sample Preparation Rw Wp1mentioning

confidence: 99%

“…Both sample conductors use Nb 3 Sn superconducting technology with forced He flow as a coolant. The conductor's design is described in detail in [4][5][6]. One of the major differences between the conductors is the different approach of the magnet system winding.…”

Section: Introductionmentioning

confidence: 99%

AC loss, interstrand resistance and mechanical properties of prototype EU DEMO TF conductors up to 30 000 load cycles

Yagotintsev

Nijhuis

2018

Supercond. Sci. Technol.

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“…HE FUTURE, post-ITER European fusion tokamak DEMO is being developed by the EUROfusion Consortium [1]. The conceptual design of the magnet system [2] so far focused on the central solenoid and toroidal field (TF) magnet. The latter was proposed in four alternative designsone based on HTS, and three employing the conventional LTS conductors [2].…”

Section: Introductionmentioning

confidence: 99%

Design and R&D for the DEMO Toroidal Field Coils Based on Nb3Sn React and Wind Method

Sedlák

Bruzzone

Sarasola

et al. 2017

IEEE Trans. Appl. Supercond.

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In 2013, the Swiss Plasma Center (SPC) proposed a Toroidal Field (TF) layout for the DEMO-EUROfusion tokamak, based on a graded winding made of layers of Nb 3 Sn (react&wind) and NbTi conductors. The R&D effort led in 2015 to a full size prototype conductor tested up to 82.4 kA at 12.35 T. The test continued in 2016 and new results are presented. In summer 2015 a new reference baseline was issued for the DEMO-EUROfusion tokamak, leading to an update of the TF requirements. The design update is presented in this paper, with the winding pack consisting of 12 single layers of Nb 3 Sn with "invisible" (no protrusion) inter-layer joints. The high grade Nb 3 Sn react&wind conductor operates at 63.3 kA, 12.23 T with T cs > 6.5 K. A new prototype conductor is being manufactured. The main advantages of the graded approach, applied to both the superconductor and the stainless steel conduit, are a substantial space and cost saving compared to the wind&react approach with pancake winding.

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“…In the framework of the Roadmap to Fusion Electricity Horizon 2020 [1], EUROfusion consortium is coordinating a comprehensive design study of a DEMOnstration fusion power plant (DEMO) [2] with the aim to demonstrate that a fusion reactor can produce net electrical power and supply energy to the grid. This paper reports on the latest status of the pre-conceptual design of the DEMO magnet system, focusing on the progress since the results already mentioned in [3]. In Section 2 three configurations for the toroidal field (TF) winding packs are proposed, based on different winding schemes (layer vs. pancake) and Nb 3 Sn manufacturing technology (wind & react (W&R) vs. react & wind (R&W)).…”

Section: Introductionmentioning

confidence: 99%

Progress in the design of the superconducting magnets for the EU DEMO

Corato

Bagni

Biancolini

et al. 2018

Fusion Engineering and Design

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In the framework of the DEMOnstration fusion power plant (DEMO) design coordinated by the EUROfusion consortium, a pre-conceptual design of the superconducting magnet system has been developed. For the toroidal field coils (TFCs), three winding pack (WP) options have been proposed; exploring different winding approaches (pancakes vs. layers), and manufacturing techniques (react & wind vs. wind & react Nb 3 Sn). Thermal-hydraulic and mechanical analyses on the three WPs have produced encouraging results, with some critical issues to be solved in future studies and optimizations. The experimental tests on TF prototype short sample conductors have demonstrated a limited performance degradation with electromagnetic cycles and significantly lower effective strains than most of the large-size Nb 3 Sn conductors reported in literature. The toroidal field quench protection circuit has been studied, starting from different topologies and focusing on the most promising one. Two designs are also presented for the central solenoid magnet, with preliminary evaluations on the AC losses during the plasma breakdown. Finally, the design of a TF winding pack based on HTS conductors and the experimental tests on "fusion-relevant" HTS cables are illustrated.

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Overview of Progress on the EU DEMO Reactor Magnet System Design

Cited by 51 publications

References 19 publications

AC loss, interstrand resistance and mechanical properties of prototype EU DEMO TF conductors up to 30 000 load cycles

AC loss, interstrand resistance and mechanical properties of prototype EU DEMO TF conductors up to 30 000 load cycles

Design and R&D for the DEMO Toroidal Field Coils Based on Nb3Sn React and Wind Method

Progress in the design of the superconducting magnets for the EU DEMO

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