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

Sedlák, Kamil; Bruzzone, Pierluigi; Sarasola, Xabier; Stepanov, B.; Wesche, R.

doi:10.1109/tasc.2016.2628814

Cited by 31 publications

(26 citation statements)

References 7 publications

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“…Out of these three alternative conductor designs, one option (TF WP#1) [71,72] is based on the react & wind (R&W) method for Nb 3 Sn magnets, in which the rectangular conductor is wound after the heat treatment, which is carried out without the stainless steel (SS) conduit and electrical insulation. The main advantage of this approach is the reduction of the effective strain acting on the superconducting cable, with an improvement of the transport capability of the superconducting strands.…”

Section: Superconducting Magnetsmentioning

confidence: 99%

“…The WP is wound in single layers (SL) which allows the grading of both superconductor (SC) and SS cross-sections in the different layers, with a relevant saving on costs. The results of the first experimental campaigns [71,72] helped to improve the layout of the conductor. Tests carried out on the last design [73] have demonstrated that there is no degradation of the current sharing temperature (Tcs) of the conductor after 1000 electro-magnetic (e-m) cycles and 4 thermal cycles.…”

Section: Superconducting Magnetsmentioning

confidence: 99%

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Overview of the DEMO staged design approach in Europe

Federici¹,

Bachmann²,

et al. 2019

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This paper describes the status of the pre-conceptual design activities in Europe to advance the technical basis of the design of a DEMOnstration Fusion Power Plant (DEMO) to come in operation around the middle of this century with the main aims of demonstrating the production of few hundred MWs of net electricity, the feasibility of operation with a closedtritium fuel cycle, and maintenance systems capable of achieving adequate plant availability. This is expected to benefit as much as possible from the ITER experience, in terms of design, licensing, and construction. Emphasis is on an integrated design approach, based on system engineering, which provides a clear path for urgent R&D and addresses the main design integration issues by taking account critical systems interdependencies and inherent uncertainties of important design assumptions (physics and technology). A design readiness evaluation, together with a technology maturation and down selection strategy are planned through structured and transparent Gate Reviews. By embedding industry experience in the design from the beginning it will ensure that early attention is given to technology readiness and industrial feasibility, costs, maintenance, power conversion, nuclear safety and licensing aspects.

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Section: Superconducting Magnetsmentioning

confidence: 99%

Section: Superconducting Magnetsmentioning

confidence: 99%

Overview of the DEMO staged design approach in Europe

Federici¹,

Bachmann²,

et al. 2019

View full text Add to dashboard Cite

show abstract

“…WP#1 [6,7] is based on the R&W method for Nb 3 Sn magnets, in which the conductor is wound after the heat treatment, which is carried out without the stainless steel (SS) conduit and electrical insulation. The WP is wound in single layers (SL); this approach allows the grading of both superconductor (SC) and SS cross-sections in the different layers, depending on the magnetic field and the local stress value, respectively.…”

Section: Tf Wp#1 Designmentioning

confidence: 99%

“…Results after the WUCD of the 2016 experimental campaign for RW1 sample are reported in Fig. 3 [6]. The "effective strain", ε eff , is the parameter to be used in the strand scaling law to fit the conductor performance.…”

Section: Tf Wp#1 Designmentioning

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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“…The conductors are composed of a flat cable with low void fraction which is reacted before jacketing; therefore the thermal compression exerted by the steel jacket on the Nb 3 Sn cable acts only from room temperature to 4.2 K, instead of starting close to the reaction temperature. The high field conductors were manufactured industrially and the effective strain fitting parameter was estimated between -0.28% and -0.32% in SPC-RW1 [26] (in this sample the jacket was only 3 mm thick). Recently [27] a second prototype, SPC-RW2, designed for different operating conditions, has been manufactured and tested; the effective strain fitting parameter shifted from an initial value of -0.35% to -0.40% after 1000 cycles.…”

Section: Review Of Demo Prototype Conductorsmentioning

confidence: 99%

Progressing in cable-in-conduit for fusion magnets: from ITER to low cost, high performance DEMO

Uglietti

Sedlák

Wesche

et al. 2018

Supercond. Sci. Technol.

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The performance of ITER Toroidal Field (TF) conductors still have a significant margin for improvement because the effective strain between-0.62% and-0.95% limits the strands critical current between 15% and 45% of the maximum achievable. Prototype Nb 3 Sn cable-in-conduit conductors have been designed, manufactured and tested in the frame of the EUROfusion DEMO activities. In these conductors the effective strain has shown a clear improvement with respect to the ITER conductors, reaching values between-0.55% and-0.28%, resulting in a strand critical current which is two to three times higher than in ITER conductors. In terms of the amount of Nb 3 Sn strand required for the construction of the DEMO TF magnet system, such improvement may lead to a reduction of at least a factor two with respect to a similar magnet built with ITER type conductors; further saving of Nb 3 Sn is possible if graded conductors/windings are employed. In the best case the TF magnet of DEMO could require less Nb 3 Sn strands than the one of ITER, despite the larger size of DEMO. Moreover high performance conductors could be operated at higher fields than ITER TF conductors, enabling the construction of low cost, compact, high field tokamaks.

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

Cited by 31 publications

References 7 publications

Overview of the DEMO staged design approach in Europe

Overview of the DEMO staged design approach in Europe

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

Progressing in cable-in-conduit for fusion magnets: from ITER to low cost, high performance DEMO

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