Measurement of the Joint Resistance of Large-Current YBCO Conductors

Terazaki, Y.; Yanagi, N.; Tomida, Sai; Noguchi, Hiroki; Natsume, Kyohei; Mito, T.; Hashizume, Hidetoshi; Sagara, A.

doi:10.1585/pfr.7.2405027

Cited by 14 publications

(10 citation statements)

References 16 publications

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“…Also the critical current and n-value are not affected by such transverse pressures, which makes it possible to produce mechanical REBCO lap splices without soldering [6,26].…”

Section: Discussionmentioning

confidence: 99%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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Abstract.We have studied the influence of transverse compressive stress on the resistance and critical current (I c ) of soldered REBCO tape lap splices. Internal contact resistances dominate the overall REBCO lap splice resistances. Application of transverse compressive stress up to 250 MPa during the resistance measurements does not alter the resistance and I c of the soldered REBCO splices that were studied. The resistance of unsoldered REBCO tape lap splices depends strongly on the contact pressure. At a transverse compressive stress of 100 MPa to which Roebel cables are typically exposed in high field magnets, the crossover splice contact resistance is comparable to the internal tape resistances.

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“…Also the critical current and n-value are not affected by such transverse pressures, which makes it possible to produce mechanical REBCO lap splices without soldering [6,26].…”

Section: Discussionmentioning

confidence: 99%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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“…For the bridgetype conductor joint shown in Fig. 5 (a), a mechanical joint technique developed at Tohoku University can be applied instead of the formerly considered soldering method [32]. For a mechanical lap joint, the joint resistivity is estimated to be ∼10 pΩm 2 [33,34], giving an overall joint resistance of ∼1 nΩ for a 100-kA conductor (consisting of 2 connections per joint with 40 HTS tapes, each having a 50-mm joint length).…”

Section: Segmented Fabrication Of Large Complex Coils Using Hts Condumentioning

confidence: 99%

Feasibility of HTS Magnet Option for Fusion Reactors

Yanagi

Terazaki

Natsume

et al. 2014

Plasma and Fusion Research

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Conceptual design studies are being carried out on the application of high-temperature superconducting (HTS) conductors and coils to the magnet systems of fusion reactors. A 100-kA-class HTS conductor is required to be applied at high magnetic fields of > 12 T. A simple stack of YBCO tapes embedded in copper and stainless-steel jackets is found to be a practical approach to producing large-scale conductors that exhibit high cryogenic stability and mechanical rigidity. The feasibility of the segmented fabrication method for large complex HTS coils, such as the helical coils in the LHD-type helical fusion reactor FFHR-d1, is being investigated by developing mechanical bridge-type lap joint technology of HTS conductors.

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“…The joint sections in the basic option shown in Fig. 1 ers are joined by soldering [5] or by bridge-type mechanical lap joint [6]. The straight joint sections for ∼ 1 m are located every half-pitch of the helical coil, which has little influence on the magnetic field for plasma confinement.…”

Section: Introductionmentioning

confidence: 99%

Bridge-Type Mechanical Lap Joint of a 100 kA-Class HTS Conductor having Stacks of GdBCO Tapes

Seino

Yanagi

Terazaki

et al. 2014

Plasma and Fusion Research

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In this paper, we reported design, fabrication and test of a prototype 100-kA-class high-temperature superconducting (HTS) conductor, especially for joint section, to be used for segmented HTS helical coils in the FFHR-d1 heliotron-type fusion reactor. The conductor has a geometry of three rows and fourteen layers of Gadolinium Barium Copper Oxide HTS (GdBCO) tapes embedded in copper and stainless steel jackets and has a joint section with bridge-type mechanical lap joint. We introduced improved method to fabricate the joint based on pilot experiments and we were able to apply a current of ∼ 120 kA at 4.2 K, 0.45 T to the sample without quench at joint. The obtained joint resistance was ∼ 2 nΩ, which was lower than our previous data. Though joint resistance increased with a rise in current and magnetic field, predicted joint resistance in the environment of actual helical coil in the FFHR-d1 was small enough to properly run the cryoplant of the reactor.

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Measurement of the Joint Resistance of Large-Current YBCO Conductors

Cited by 14 publications

References 16 publications

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Feasibility of HTS Magnet Option for Fusion Reactors

Bridge-Type Mechanical Lap Joint of a 100 kA-Class HTS Conductor having Stacks of GdBCO Tapes

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