Prospects for the fabrication of low aspect ratio coated conductors by inclined substrate deposition

Ma, Beihai

doi:10.1088/0953-2048/19/6/015

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…Recent production advances have both vastly improved the in-field performance and increased the available commercial lengths of high-temperature superconducting (HTS) tapes known as coated conductors (CCs), leading to increased use of this conductor technology in numerous superconducting systems. HTS CC tapes comprise a strong crystallographic textured composite stack of buffer layers (∼0.1-2 µm) with a typical 1-5 µm thin superconducting rare-earth-based barium copper oxide (REBCO) layer deposited on 30-100 µm thick and mechanically strong metal substrates made from Hastelloy or Ni-W alloy tapes [1][2][3][4][5][6][7][8][9][10][11][12][13]. While CCs are being consolidated as the technical conductor solution for many high-field electromagnet systems [1,14,15], challenges (re)appear due to superconducting screening-current-induced fields (SCIFs) in 4-12 mm wide tapes [16,17].…”

Section: Introductionmentioning

confidence: 99%

Topical Review: Multifilamentary coated conductors for ultra-high magnetic field applications

Wulff

Abrahamsen

Insinga

2021

Supercond. Sci. Technol.

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High-temperature superconducting coated conductors (CCs) are considered an enabling ultra-high field (UHF) tape-conductor technology due to their extremely high engineering current densities at very high magnetic fields and low temperatures, and high mechanical strength. A major challenge is however related to induction of problematically large superconducting screening currents (as an effect of the large width-to-thickness ratio) when the wide tape conductors are exposed to strong transverse magnetic fields above 20 T, which is the case in many UHF magnet systems. Subdividing the superconducting layer into narrow parallel decoupled filaments has been shown to effectively reduce superconducting screening currents by a factor comparable to the number of filaments. The filamentization is however not effective until the induced coupling currents flowing across the filaments have decayed. The effectiveness of the multifilamentary structure in suppressing coupling currents and reducing the decay time constants is directly linked to potential current paths between filaments. Very recent experimental and numerical studies have examined both the challenge of magnet precision, caused by screening-current-induced fields, and the fatal consequences of local uneven tape stresses exceeding the irreversible limits for commercial CCs. These studies have conclusively revealed that screening currents must not be ignored in the mechanical design and other studies have introduced multifilamentary CCs as a viable solution. This paper aims to review the efforts made in developing and investigating multifilamentary CCs for ultra-high field applications focusing on the screening-current-related mechanisms, critical system-level effects, effectiveness of filamentization in UHFs, fabrication and large-scale analysis of multifilamentary CCs, in addition to providing cost estimates of previously studied filamentized CC fabrication techniques.

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Section: Introductionmentioning

confidence: 99%

Topical Review: Multifilamentary coated conductors for ultra-high magnetic field applications

Wulff

Abrahamsen

Insinga

2021

Supercond. Sci. Technol.

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“…1. The attempts to prepare the Coated Round Wire (CRW) by deposition of HTS layer on a round substrate did not led to significant success [6], [7]. Nevertheless the efforts to obtain it by deforming a standard CC tape with strip-like cross-section to a circular shape [8] are continuing and therefore we included this concept in our comparative study.…”

Section: Introductionmentioning

confidence: 99%

Round Conductor With Low AC Loss Made From High-Temperature Superconducting Tapes

Gömöry

Šouc

Vojenčiak

et al. 2015

IEEE Trans. Appl. Supercond.

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The second generation of high-temperature superconductor tape exhibits rapidly progressing electric transport capacity. However, its use as a conductor in magnet technology is somewhat held up by the strip-like geometry. Possible solution is the helical layout of parallel tapes on a flexible round former (recently called the Coated Conductor on Round Core or CORC). We present the study of AC properties of single-layer CORC conductors made from tapes with non-magnetic substrate. When subjected to AC magnetic field, single-layer CORC conductors exhibit negligible coupling currents because the tapes are fully transposed. On top of this the hysteresis loss can be reduced by the tape striation. Numerical simulations of magnetization loss for CORC conductors are in good agreement with experimental data. Prediction of AC loss in a coil made from CORC is compared to that calculated for a classical double pancake one made from the same amount of tape. Result indicate that the CORC-made coil produces lower losses at AC current amplitudes approaching the critical current.

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“…In this paper, we utilize the same approach for a system of identical curved tapes, which we call for brevity an arc-polygonal cable. This configuration describes more accurately the curvature of the tapes in conductor-on-round-core (CORC) cables [2] and in other conductor concepts featuring curved tapes [3,4].…”

Section: Introductionmentioning

confidence: 99%

Critical state solution of a cable made of curved thin superconducting tapes

Brambilla

Grilli

2014

Supercond. Sci. Technol.

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In this paper we develop a method based on the critical state for calculating the current and field distributions and the AC losses in a cable made of curved thin superconducting tapes. The method also includes the possibility of considering spatial variation of the critical current density, which may be the result of the manufacturing process. For example, rare-earth based coated conductors are known to have a decrease of the transport properties in near the edges of the tape: this influences the way current and field penetrate in the sample and, consequently, the AC losses. We demonstrate that curved tapes arranged on a cylindrical former behave as an infinite horizontal stack of straight tapes, and we compare the AC losses in a variety of working conditions, both without and with the lateral dependence of the critical current density. This model and subsequent similar approaches can be of interest for various applications of coated conductors, including power cables and conductor-on-round-core (CORC) cables.

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Prospects for the fabrication of low aspect ratio coated conductors by inclined substrate deposition

Cited by 10 publications

References 23 publications

Topical Review: Multifilamentary coated conductors for ultra-high magnetic field applications

Topical Review: Multifilamentary coated conductors for ultra-high magnetic field applications

Round Conductor With Low AC Loss Made From High-Temperature Superconducting Tapes

Critical state solution of a cable made of curved thin superconducting tapes

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