Microstructure observations on butt joint composed of Nb3Sn CIC conductors

Obana, T.; Tokitani, M.; Takahata, K.; Kizu, K.; Murakami, Haruyuki

doi:10.1016/j.cryogenics.2016.11.009

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…All coils are wound with Nb 3 Sn CIC conductors. Each pancake coil is connected through butt joints [15][16][17] of the conductor. The number of coil winding layers is 52.…”

Section: Ms Pancake Coil and Nb 3 Sn Cic Conductormentioning

confidence: 99%

Investigation into Quench Detection for a Multi-Stacked Pancake Coil Wound with Nb<sub>3</sub>Sn CIC Conductors

Obana

Takahata

Murakami

2020

Plasma and Fusion Research

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For a multi-stacked (MS) pancake coil wound with Nb 3 Sn CIC conductors, quench detection methods using voltage measurements were investigated. In this study, we utilized two methods: the balanced voltage between two coil windings and the balanced voltage between one coil winding and a disk-shaped pickup coil. During the energization of the MS pancake coil, voltage measurements of the coil were conducted to compare the measurement results of the two quench detection methods. The measurement results indicate that the quench detection based on the balanced voltage between two coil windings is more reliable than the other. In the measurements, spike voltages were observed when there was a rapid change of a coil current. Magnetization of the MS pancake coil is considered one cause of the spikes. When determining criteria of quench detection, spike voltages should be taken into account to prevent malfunction of a quench detection system.

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“…All coils are wound with Nb 3 Sn CIC conductors. Each pancake coil is connected through butt joints [15][16][17] of the conductor. The number of coil winding layers is 52.…”

Section: Ms Pancake Coil and Nb 3 Sn Cic Conductormentioning

confidence: 99%

Investigation into Quench Detection for a Multi-Stacked Pancake Coil Wound with Nb<sub>3</sub>Sn CIC Conductors

Obana

Takahata

Murakami

2020

Plasma and Fusion Research

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“…In Table 2, the specification of the CS conductor is listed. Each coil was connected through butt joints [8,9] of the conductors.…”

Section: Jt-60 Sa Cs1 Modulementioning

confidence: 99%

“…The conductor lengths of the model coil and the CS1 module were approximately 200 m and 2600 m, respectively. In the CS1 module, as described in Section 2, each pancake coil was connected using butt joint technology where two superconducting cables were connected through a 0.1 mm-thick-copper sheet by diffusion bonding [8,9]. Therefore, loop currents, which are supercurrents, cannot flow along the entire length of the CS1 module due to the resistance of the butt joint while holding coil current after coil excitation and degauss.…”

Section: -1 Comparison Between the Cs1 Module And The Cs Model Coil I...mentioning

confidence: 99%

Investigation of long time constants of magnetic fields generated by the JT-60SA CS1 module

Obana

Takahata

Hamaguchi

et al. 2018

Fusion Engineering and Design

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A comparative study of compositions and microstructures of two types internal-tin process Nb3Sn wires

Zhang

Huang

et al. 2020

Cryogenics

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Microstructure observations on butt joint composed of Nb3Sn CIC conductors

Cited by 3 publications

References 9 publications

Investigation into Quench Detection for a Multi-Stacked Pancake Coil Wound with Nb<sub>3</sub>Sn CIC Conductors

Investigation into Quench Detection for a Multi-Stacked Pancake Coil Wound with Nb<sub>3</sub>Sn CIC Conductors

Investigation of long time constants of magnetic fields generated by the JT-60SA CS1 module

A comparative study of compositions and microstructures of two types internal-tin process Nb3Sn wires

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