26 T 35 mm all-GdBa2Cu3O7–xmulti-width no-insulation superconducting magnet

Yoon, Sanghyun; Kim, Jaemin; Cheon, Kyekun; Lee, Hunju; Hahn, Seungyong; Moon, Seung‐Hyun

doi:10.1088/0953-2048/29/4/04lt04

Cited by 256 publications

(136 citation statements)

References 32 publications

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“…The maximum allowable longitudinal strain before I c degradation occurs is around 0.65%, at stress levels of 600 to 800 MPa depending on the Cu-thickness [14, 17, 18]. There are currently a number of magnets that have reached fields beyond 23.5 T [14, 19, 20, 21], a special cryogen-free magnet [22], and a 32 T user magnet that is planned for early 2017 [14, 19]. Though REBCO exhibits electronic anisotropy [6, 13] that somewhat complicates its application, the current-density in the “bad” direction ( B ⊥ ab ) is sufficiently high for 30 T and higher-field solenoid applications (figure 1).…”

Section: Introductionmentioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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We performed a feasibility study on a high-strength Bi2−xPbxSr2Ca2Cu3O10−x (Bi-2223) tape conductor for high-field solenoid applications. The investigated conductor, DI-BSCCO Type HT-XX, is a pre-production version of Type HT-NX, which has recently become available from Sumitomo Electric Industries (SEI). It is based on their DI-BSCCO Type H tape, but laminated with a high-strength Ni-alloy. We used stress-strain characterizations, single- and double-bend tests, easy- and hard-way bent coil-turns at various radii, straight and helical samples in up to 31.2 T background field, and small 20-turn coils in up to 17 T background field to systematically determine the electro-mechanical limits in magnet-relevant conditions. In longitudinal tensile tests at 77 K, we found critical stress- and strain-levels of 516 MPa and 0.57%, respectively. In three decidedly different experiments we detected an amplification of the allowable strain with a combination of pure bending and Lorentz loading to ≥ 0.92% (calculated elastically at the outer tape edge). This significant strain level, and the fact that it is multi-filamentary conductor and available in the reacted and insulated state, makes DI-BSCCO HT-NX highly suitable for very high-field solenoids, for which high current densities and therefore high loads are required to retain manageable magnet dimensions.

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Section: Introductionmentioning

confidence: 99%

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

Godeke

Abraimov

Arroyo

et al. 2017

Supercond. Sci. Technol.

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“…[1][2][3][4] HTS are not subjected to stability issues as LTS, and can, in principle, be operated without any protection. 5 However, this is usually not the case for HTS magnets, whose protection against quenchinduced damages is motivated by their high cost.…”

mentioning

confidence: 99%

“…1,6 Coils made using the no-insulation winding technique revealed to be self-protecting, since the current can automatically bypass the normal spot. 2,7 The normal zone propagation velocity (NZPV), i.e., the velocity of the superconducting/normal boundary during a quench, plays a key role in the quench process. The longitudinal component of the NZPV assumes values two/three orders of magnitude smaller in 2G HTS than LTS.…”

mentioning

confidence: 99%

An equation for the quench propagation velocity valid for high field magnet use of REBCO coated conductors

Bonura

Senatore

2016

Applied Physics Letters

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Based on a study of the thermophysical properties, we derived a practical formula for the normal zone propagation velocity appropriate for REBa2Cu3O7-x coated conductors in high magnetic fields. An analytical expression to evaluate the current sharing temperature as a function of the operating conditions is also proposed. The presented study has allowed us to account for experimental results not fully understood in the framework of the models widely used in the literature. In particular, we provided a fundamental understanding of the experimental evidence that the normal zone propagation velocity in REBa2Cu3O7-x coated conductors can be mainly determined by the operating current, regardless of the applied field and temperature

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“…Recently, the SuNAM Co. manufactured multi-width no-insulation superconducting magnet using GdBCO HTS tape [5]. A specification and shape of virtual HTS magnet for using simulation are modeled with reference to this HTS magnet.…”

Section: Specification Of Virtual Hts Magnetmentioning

confidence: 99%

A simulation study on the variation of virtual NMR signals by winding, bobbin, spacer error of HTS magnet

Kim

Lee

Kim

et al. 2016

Progress in Superconductivity and Cryogenics

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Recently, production technique and property of the High-Temperature Superconductor (HTS) tape have been improved. Thus, the study on applying an HTS magnet to the high magnetic field application is rapidly increased. A Nuclear Magnetic Resonance (NMR) spectrometer requires high magnitude and homogeneous of central magnetic field. However, the HTS magnet has fabrication errors because shape of HTS is tape and HTS magnet is manufactured by winding HTS tape to the bobbin. The fabrication errors are winding error, bobbin diameter error, spacer thickness error and so on. The winding error occurs when HTS tape is departed from the arranged position on the bobbin. The bobbin diameter and spacer thickness error occur since the diameter of bobbin and spacer are inaccurate. These errors lead magnitude and homogeneity of central magnetic field to be different from its ideal design. The purpose of this paper is to investigate the effect of winding error, bobbin diameter error and spacer thickness error on the central field and field homogeneity of HTS magnet using the virtual NMR signals in MATLAB simulation.

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26 T 35 mm all-GdBa₂Cu₃O_7–xmulti-width no-insulation superconducting magnet

Cited by 256 publications

References 32 publications

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

A feasibility study of high-strength Bi-2223 conductor for high-field solenoids

An equation for the quench propagation velocity valid for high field magnet use of REBCO coated conductors

A simulation study on the variation of virtual NMR signals by winding, bobbin, spacer error of HTS magnet

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