Joints for large superconducting conductors

Decool, P.; Ciazynski, D.; Nobili, A; Parodi, S.; Pesenti, Paolo; Bourquard, A.; Beaudet, F

doi:10.1016/s0920-3796(01)00408-2

Cited by 31 publications

(10 citation statements)

References 2 publications

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“…In parallel with subsize sample tests, mechanical tests were performed by CEA to assess the properties of the bimetallic explosive bond on steel-copper plate and on incoloy-copper plate. These tests confirmed the capability of such plates in the joint application [10].…”

Section: Evolution Of the Joint Conceptsupporting

confidence: 72%

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Large superconductors and joints for fusion magnets: From conceptual design to testing at full scale

et al. 2001

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A new kind of superconductor, using the cable-in-conduit concept, is emerging, mainly in the context of fusion activity. At present no large Nb3Sn magnet in the world is operating using this concept. The difficulty of this technology, which has now been studied for 20 years, is that it requires major advances in several interconnected new fields, such as handling a large number (1000) of superconducting strands, high current conductors (50 kA), forced flow cryogenics, Nb3Sn technology, low loss conductors in pulsed operation, high current connections and high voltage insulation (10 kV), as well as demonstration of its economical and industrial feasibility. CEA has been very much involved, during the past ten years, in this development, which took place in the framework of the NET and ITER technological programmes. One major milestone was reached in 1998-1999 with the successful tests by Euratom-CEA of three full size conductor and connection samples in the SULTAN facility in Switzerland.

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Section: Evolution Of the Joint Conceptsupporting

confidence: 72%

“…Thus handling of the brittle Nb 3 Sn cable can be avoided after the heat treatment (needed to fabricate the superconductor), and helium leak tests can be performed before and after this heat treatment and therefore before the final coil assembly. In this way, the full advantage of the twin box concept is realized [10].…”

Section: Evolution Of the Joint Conceptmentioning

confidence: 99%

Large superconductors and joints for fusion magnets: From conceptual design to testing at full scale

et al. 2001

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“…14) (Salpietro et al, 1999). (Libeyre et al, 1998;Decool et al, 2001). Die elektrische Lötverbindung wird erst unmittelbar vor der Imprägnierung der Nach dem Zurücklegen der Wicklungen in die Radialplatten kommen zwei vorbereitete Leiterenden mit ihren Kontaktflächen aufeinander zu liegen und werden mit einander verlötet und zusammengepresst (siehe Abb.…”

Section: Bau Der Iter-modellspule Tfmcunclassified

ove Nachrichten

2006

Elektrotech. Inftech.

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“…A Nb 3 Sn cable-in-conduit (CIC) conductor is adopted for Toroidal Field (TF) coils of ITER. One of the TF coils consists of seven double-pancake coils that are jointed to the neighbor coils at the lower position with "twin-box" joints [1,2]. In order to attain low joint resistance in nΩ, the Nb 3 Sn strands are directly jointed to a copper sleeve of the box by sintering, and the copper sleeve is jointed to that of the adjacent box by soldering [3,4].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Decay of Shielding Currents in ITER-TF Joint Samples

Imagawa

Kajitani²,

Obana

et al. 2022

Plasma and Fusion Research

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As a qualification test of ITER-TF coils, each joint sample was tested prior to manufacture of each TF coil. Eleven joint samples were tested by a conductor test facility with a 9 T split coil. The joint sample comprised two short TF conductors that had twin-box joint terminals at both ends. The lower joint is a testing part that is a full-size joint of the TF coil. Hall probes were attached on the lower joint box to measure the field induced by shielding currents. In order to simulate the shielding currents, an equivalent current circuit has been considered. The main loop of the shielding currents is the current flow in two conductors with crossing the jointed plane twice. The other two loops are the current loops inside superconducting cables in the two conductors. The resistance of the latter loops is given by twice the value of an average contact resistance between the superconducting strands. The calculated results are in good accordance with the experimental data, with an assumption that the overall joint resistance is decreased at low current. This phenomenon can be explained by the existence of a few strands contacting the joint box with extremely low joint resistances.

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Joints for large superconducting conductors

Cited by 31 publications

References 2 publications

Large superconductors and joints for fusion magnets: From conceptual design to testing at full scale

Large superconductors and joints for fusion magnets: From conceptual design to testing at full scale

ove Nachrichten

Simulation of Decay of Shielding Currents in ITER-TF Joint Samples

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