Influence of Indentation on the Critical Current of Nb3Sn Strands

Suwa, Takeshi; Nabara, Y.; Takahashi, Yoshikazu; Oshikiri, M.; Tsutsumi, F.; Yoshihiko, Nunoya; Murakami, Y.; Miyashita, K.; Sim, Kihong; Kwon, Soun Pil

doi:10.1016/j.phpro.2015.06.153

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…Clear deformation of the Nb 3 Sn strands was found during cabling, as shown in figure 2. The effect of deformation on the superconducting properties prior to heat treatment was investigated and it was found that the I c of ITER internal tin strands starts to exhibit degradation when subjected to indentations deeper than a certain value [14][15][16]. At present, no effective solution has been found to prevent strand deformation during STP cabling.…”

Section: Conductor Design and Sample Preparationmentioning

confidence: 99%

“…Research has been carried out on the performance of strand with indentation, showing that indentation of less than some value (e.g. depth<0.23 mm) hardly has an impact on the critical current (I c ) [14][15][16]. However, no research has been done on the related impact of indentation on the performance of both strand and CICC under mechanical load.…”

Section: Introductionmentioning

confidence: 99%

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New design of cable-in-conduit conductor for application in future fusion reactors

Qin

Wang

et al. 2017

Supercond. Sci. Technol.

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The China Fusion Engineering Test Reactor (CFETR) is a new tokamak device whose magnet system includes toroidal field, central solenoid (CS) and poloidal field coils. The main goal is to build a fusion engineering tokamak reactor with about 1 GW fusion power and self-sufficiency by blanket. In order to reach this high performance, the magnet field target is 15 T. However, the huge electromagnetic load caused by high field and current is a threat for conductor degradation under cycling. The conductor with a short-twist-pitch (STP) design has large stiffness, which enables a significant performance improvement in view of load and thermal cycling. But the conductor with STP design has a remarkable disadvantage: it can easily cause severe strand indentation during cabling. The indentation can reduce the strand performance, especially under high load cycling. In order to overcome this disadvantage, a new design is proposed. The main characteristic of this new design is an updated layout in the triplet. The triplet is made of two Nb 3 Sn strands and one soft copper strand. The twist pitch of the two Nb 3 Sn strands is large and cabled first. The copper strand is then wound around the two superconducting strands (CWS) with a shorter twist pitch. The following cable stages layout and twist pitches are similar to the ITER CS conductor with STP design. One short conductor sample with a similar scale to the ITER CS was manufactured and tested with the Twente Cable Press to investigate the mechanical properties, AC loss and internal inspection by destructive examination. The results are compared to the STP conductor (ITER CS and CFETR CSMC) tests. The results show that the new conductor design has similar stiffness, but much lower strand indentation than the STP design. The new design shows potential for application in future fusion reactors.

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Section: Conductor Design and Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New design of cable-in-conduit conductor for application in future fusion reactors

Qin

Wang

et al. 2017

Supercond. Sci. Technol.

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“…From the former research [15], [16], [18], it's clear that the alloy phase superconductors, NbTi and Nb 3 Sn show good mechanical properties, e.g. high yield strength although Nb 3 Sn filament shows more brittle compared with NbTi filament after heat treatment.…”

Section: Discussion and Comparison With Nb 3 Sn Nbti And Bi-2212 Roun...mentioning

confidence: 99%

Impact of Indentation on the Performance of MgB₂Round Wire

Dai

Qin

Liu

et al. 2017

IEEE Trans. Appl. Supercond.

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MgB 2 round wire is a promising material for future fusion Cable in Conduit Conductor applied in low magnetic field, due to its larger T-margin compare with NbTi. It's a competitive candidate for feeders, poloidal field or correction coils. Since MgB 2 is sensitive to strain, a short twist pitch cable pattern will be taken into consideration. During cabling and conductor manufacturing, the compression on the strand is inevitable, for a cable with short twist pitch can make more severe indentation on the strands. Previous studies have shown that indentation can caused degradation of the critical current of Nb 3 Sn and Bi-2212 round wires. So the same research is performed on MgB 2 round wire, in this paper, the critical current of artificially indented samples is measured, and the results are compared with artificially indented Nb 3 Sn, NbTi and Bi-2212 round wires.

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“…Calzolaio和Bruzzone [107] 的磁化测试等效应变实验同样显示, 短节距导体内部等效压缩应变随循环次数的增加而减小, Harjo等人 [86] 用中子散射的方法发现了相同的规律. 近年来Takahashi等人 [113] , Sanabria等人 [72,115,116] , Qin等人 [117] 和Tomone等人 [118] 研究发现横向电磁力作用下的股线弯曲、挤压变形、芯丝断裂等并非是导致T cs 退化的主要原因. 并且认为电缆与导体之间可能存在slip-stick(黏滑)行为是造成T cs 变化的主要机制 [116] .…”

Section: 发现标准的Csio1导体与长节距csio2-ltp导体分unclassified

Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project

2017

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Influence of Indentation on the Critical Current of Nb3Sn Strands

Cited by 14 publications

References 5 publications

New design of cable-in-conduit conductor for application in future fusion reactors

New design of cable-in-conduit conductor for application in future fusion reactors

Impact of Indentation on the Performance of MgB₂Round Wire

Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project

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Influence of Indentation on the Critical Current of Nb3Sn Strands

Cited by 14 publications

References 5 publications

New design of cable-in-conduit conductor for application in future fusion reactors

New design of cable-in-conduit conductor for application in future fusion reactors

Impact of Indentation on the Performance of MgB2Round Wire

Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project

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Impact of Indentation on the Performance of MgB₂Round Wire