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

Obana, T.; Takahata, K.; Hamaguchi, S.; Chikaraishi, H.; Takada, Suguru; Iwamoto, A.; Imagawa, S.; Mito, T.; Murakami, Haruyuki; Natsume, Kyohei; Kizu, K.

doi:10.1016/j.fusengdes.2018.10.005

Cited by 1 publication

(2 citation statements)

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“…The MS pancake coil, which is the JT-60SA CS1 module, is composed of six octa-pancake (OP) coils and one quad-pancake (QP) coil [10,14,15]. The QP coil is sandwiched between the six OP coils.…”

Section: Ms Pancake Coil and Nb 3 Sn Cic Conductormentioning

confidence: 99%

“…In this study, these two methods of quench detection are investigated experimentally by using a multi-stacked (MS) pancake coil wound with Nb 3 Sn cable-in-conduit (CIC) conductors. The experiment with the MS pancake coil was conducted in the coil test facility at the National Institute for Fusion Science (NIFS) [10][11][12][13]. This paper describes the measurements of the balanced voltage for the MS pancake coil by the two quench detection methods.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ms Pancake Coil and Nb 3 Sn Cic Conductormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%