Inter-Layer Joint for the TF Coils of DEMO-Design and Test Results

In summer 2015, a new reference baseline is issued for the DEMO EUROfusion tokamak. Thereafter, the toroidal field (TF) coils have been updated with the new layout of the react-and-wind conductor proposed by the Swiss Plasma Center (SPC). Each TF coil consists of 12 single layers of graded Nb3Sn conductors connected in series by "invisible" inter-layer joints fully embedded in the winding pack. The high-grade Nb3Sn conductor operates at 63 kA, 12.2 T with T-cs > 6.5 K. The new prototype of the high grade cable had been manufactured by ENEA at TRATOS, Italy, and delivered to SPC: 20 m of Nb3Sn and about 10 m of copper dummy conductor. The SULTAN conductor sample consisting of two identical, beforehand heat-treated conductors was prepared and tested at SPC in May-June 2017. Upon the completion of comprehensive conductor tests, the one of those conductors was used for manufacturing of the designed at SPC potentially applicable inter-layer TF joint. The conductor was cut, and then, joined again in accordance with the developed at SPC design of inter-layer joint. The SULTAN sample comprising the earlier tested non-destroyed conductor and the earlier tested, but then cut and joined conductor was re-assembled and tested in the SULTAN test facility at SPC in August 2017.

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Pierluigi Bruzzone, Kamil Sedlák, Boris Stepanov
2018
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https://infoscience.epfl.ch/record/233993?ln=fr

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Tokamak

thumb|Vue intérieure du tore du Tokamak à configuration variable (TCV), dont les parois sont recouvertes de tuiles de graphite. Un tokamak est un dispositif de confinement magnétique expérimental explorant la physique des plasmas et les possibilités de produire de l'énergie par fusion nucléaire. Il existe deux types de tokamaks aux caractéristiques sensiblement différentes, les tokamaks traditionnels toriques (objet de cet article) et les tokamaks sphériques.

Énergie de fusion nucléaire

vignette| L'expérience de fusion magnétique du Joint European Torus (JET) en 1991. L'énergie de fusion nucléaire est une forme de production d'électricité du futur qui utilise la chaleur produite par des réactions de fusion nucléaire. Dans un processus de fusion, deux noyaux atomiques légers se combinent pour former un noyau plus lourd, tout en libérant de l'énergie. De telles réactions se produisent en permanence au sein des étoiles. Les dispositifs conçus pour exploiter cette énergie sont connus sous le nom de réacteurs à fusion nucléaire.

Toroidal and poloidal coordinates

The terms toroidal and poloidal refer to directions relative to a torus of reference. They describe a three-dimensional coordinate system in which the poloidal direction follows a small circular ring around the surface, while the toroidal direction follows a large circular ring around the torus, encircling the central void. The earliest use of these terms cited by the Oxford English Dictionary is by Walter M.

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