The normal-zone propagation properties of the non-insulated HTS coil in cryocooled operation

Kim, S.B.; Saitou, A.; Joo, Jin-Hong; Kadota, Toshie

doi:10.1016/j.physc.2011.05.209

Cited by 44 publications

(14 citation statements)

References 8 publications

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“…The non-insulated (NI) coils have been investigated since the early work of Hahn [102], where a non-insulated ReBCO coil was shown to carry 2.7 I c without burning. Recently, NI coils have become a topic of intense research [103][104][105] due to a phenomenal stability to quenching observed in those coils. This stability comes with the price of an inability to vary the current in coils at a fast rate, since any excess current would flow radially between the turns rather than along the conductor length.…”

Section: Conductor Modificationmentioning

confidence: 99%

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Marchevsky

2021

Instruments

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High-temperature superconductors (HTS) are being increasingly used for magnet applications. One of the known challenges of practical conductors made with high-temperature superconductor materials is a slow normal zone propagation velocity resulting from a large superconducting temperature margin in combination with a higher heat capacity compared to conventional low-temperature superconductors (LTS). As a result, traditional voltage-based quench detection schemes may be ineffective for detecting normal zone formation in superconducting accelerator magnet windings. A developing hot spot may reach high temperatures and destroy the conductor before a practically measurable resistive voltage is detected. The present paper discusses various approaches to mitigating this problem, specifically focusing on recently developed non-voltage techniques for quench detection.

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Section: Conductor Modificationmentioning

confidence: 99%

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Marchevsky

2021

Instruments

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“…Tests at 77 K with these coils demonstrated that the NI coils can withstand over 2.5 times the coil critical current without burning, while insulated coil are very quickly damaged as soon as the critical current is exceeded. Investigation on NZPV was carried out with distributed thermocouples and voltage taps [143].…”

Section: Quench Protectionmentioning

confidence: 99%

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Senatore

Alessandrini

Lucarelli

et al. 2014

Supercond. Sci. Technol.

255

136

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Recent progresses in the second generation REBa 2 Cu 3 O 7 − x (RE123) coated conductor (CC) have paved a way for the development of superconducting solenoids capable of generating fields well above 23.5 T, i.e. the limit of NbTi−Nb 3 Sn-based magnets. However, the RE123 magnet still poses several fundamental and engineering challenges. In this work we review the state-ofthe-art of conductor and magnet technologies. The goal is to illustrate a close synergetic relationship between evolution of high-field magnets and advancement in superconductor technology. The paper is organized in three parts: (1) the basics of RE123 CC fabrication technique, including latest developments to improve conductor performance and production throughput; (2) critical issues and innovative design concepts for the RE123-based magnet; and (3) an overview of noteworthy ongoing magnet projects.

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“…I N THE recent years, the No-Insulation (NI) winding technique is emerging as a valid alternative to conventional High Temperature Superconductor (HTS) insulated coils [1]- [3]. The absence of electrical insulation between turns allows the operating current to flow radially, thus avoiding damaged areas [1]- [3]. In the literature, it has been demonstrated how NI windings can work properly even in the presence of defects along the conductor length [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

“…The absence of electrical insulation between turns allows the operating current to flow radially, thus avoiding damaged areas [1]- [3]. In the literature, it has been demonstrated how NI windings can work properly even in the presence of defects along the conductor length [1]- [3]. An effective current and temperature redistribution in the winding improves the NI coil thermal stability, compared to its insulated counterpart [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

Musso

Bang

Bong

et al. 2022

IEEE Trans. Appl. Supercond.

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One of the technical issues in the application of High Temperature Superconducting (HTS) tapes to magnet technology is the need to wind long tape sections with uniform electric properties along the length. It has been reported that a No-Insulation (NI) coil can properly work even in the presence of defective super-conductive regions, with a minimal drop of performance as com-pared to its "defect-free" counterpart. This could open up the possibility of manufacturing coils by jointing together several tape segments of limited length, lowering the conductor cost. In this work, a single pancake NI HTS coil is wound using several tape segments cut from the same lot, jointed together. The electrical resistance of each joint is set independently, realizing either high or low resistance joints. Thus, the coil is designed to include multiple defective sections at specific locations. The coil is refrigerated by conduction-cooling, and tested at different temperatures and charging rates. The coil instrumentation allows measuring the voltage over the whole winding, as well as the magnetic field in the central bore. The measurements are used to study the defect-irrelevant behavior of the coil. A simple equivalent lumped parameter circuit is applied to derive the coil effective parameters and analyze its electromagnetic behaviour.

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The normal-zone propagation properties of the non-insulated HTS coil in cryocooled operation

Cited by 44 publications

References 8 publications

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

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