Magnet design with 100-kA HTS STARS conductors for the helical fusion reactor

High Temperature Superconducting (HTS) materials have the potential to generate magnetic field beyond the level obtainable with Low Temperature Superconducting (LTS). This review reports the past and present R&D on HTS cables and conductors for high field tokamaks, accelerator dipoles and large solenoids. Among the HTS wires and tapes available commercially, coated conductor tapes are the most appealing because of the outstanding critical strength and large improvement margin. Limitations are the weakness against peeling and shearing and the short piece length. The prices for technical superconductors are reviewed because they play an important role in large projects; moreover the perspective of industrial production of HTS wires and tapes is discussed considering the historical development of the LTS wire market. Various designs have been proposed for HTS cables and conductors: some are better suited for soft materials, while others can exploit the anisotropy of coated conductors (by aligning the tape with the field), providing the highest current density. The last decade has seen an increase in the size and complexity of the prototypes; however some peculiar features of HTS, such as high stability margin and high mechanical limits, have not yet been fully incorporated in the designs: for example the transposition requirements for HTS have not yet been studied in detail. Several facts indicate that tapes (even if anisotropic) can be used for manufacturing cables and magnets of any size and have advantages with respect to round wires.

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“…Further studies [163] regarded the quench protection and the cooling by He gas, which should not pose big challenges.…”

Section: Segmented Coil (Non-transposed Stack Of Bi2223 and Rebco)mentioning

confidence: 99%

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

Uglietti

2019

Supercond. Sci. Technol.

181

123

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“…In addition, the tapes are not twisted and the magnetic field is always parallel to the c-axis of the tapes. This is the model so far used in most of the quench simulation studies (see [1,2,11,12,20]).…”

Section: B Modeling Of the Conductormentioning

confidence: 99%

“…OATED conductor (or REBCO) tape is a candidate for high temperature superconducting magnets for future fusion devices. These magnets are designed either to work at higher temperature [1][2][3][4] and/or to achieve a higher magnetic field [3][4][5] above the range of Nb based low temperature superconductors (LTS). Thanks to the high critical temperature (T c ), HTS materials are generally much more thermally stable than LTS.…”

Section: Introductionmentioning

confidence: 99%

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Quench Simulation of REBCO Cable-in-Conduit Conductor With Twisted Stacked-Tape Cable

Kang

Uglietti

Wesche

et al. 2020

IEEE Trans. Appl. Supercond.

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Quench protection is a critical issue for magnet using high temperature superconducting (HTS) materials like REBCO. For cable-in-conduit conductor (CICC) with twisted REBCO tapes, the angular dependent critical current density (Jc) of tape will further complicates the quench behavior. The CryoSoft code THEA is used to simulate the quench behavior of various sub-scale CICC in view of a quench experiment in SULTAN facility. The CICC are composed of the twisted tape stack assembled into copper shell (strand). It has been found that neglecting the angular dependence of Jc in quench simulation will significantly underestimate the hot spot temperature therefore leave potential risk to damage the magnet. It is also shown that the contact thermal resistance between strand and the steel jacket plays a very important role on quench behavior. On the other hand, the interstrand electric/thermal resistance has very little influence.

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“…The FFHR-d1 is basically a heliotron device similar to the LHD [3] and consists of two main helical coils and 4 planar poloidal field coils [4] of high-temperature superconducting (SC) magnet [5]. The device size is four times larger than the LHD.…”

Section: Introductionmentioning

confidence: 99%

Cartridge-Type Helical Blankets Aiming at Easy Construction and Maintenance for the FFHR-d1

Miyazawa

Tamura

Tanaka

et al. 2017

Plasma and Fusion Research

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A new cartridge-type blanket named the CARDISTRY-B is proposed for the helical fusion reactor FFHRd1. This blanket is composed of the neutron shield and the tritium breeder using molten salt. Both of these are toroidally segmented every two degrees. At each toroidal angle, the segmented parts are divided further into several cartridges in order to make it possible to assemble these cartridges after completion of the superconducting magnet coils. The neutron shield is basically assembled by using mortise and tenon prepared on each of the cartridges and the lower port, instead of the wide area welding. After assembly, the plasma side of the neutron shield is welded to form a vacuum vessel. Another side of the neutron shield facing on the superconducting magnet coils is covered with the thermal shield, which was already attached before assembly. The tritium breeder cartridges can be replaced without cutting or welding of cooling pipes inside the vacuum vessel, where severe radiation dose is expected. Details of the CARDISTRY-B, including the results of motion analysis for all cartridges and estimation of the cartridge weight, are discussed.

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Magnet design with 100-kA HTS STARS conductors for the helical fusion reactor

Cited by 26 publications

References 19 publications

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

Quench Simulation of REBCO Cable-in-Conduit Conductor With Twisted Stacked-Tape Cable

Cartridge-Type Helical Blankets Aiming at Easy Construction and Maintenance for the FFHR-d1

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