Feasibility Study of the Impregnation of a No-Insulation HTS Coil Using Solder

Li, Yuqian; Hu, Dawei; Zhang, Jianwen; Wu, Wei; Li, Zhuyong; Ryu, K.; Hong, Zhiyong; Jin, Zhijian

doi:10.1109/tasc.2017.2773831

Cited by 26 publications

(18 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ideal situation is a support medium that provides the requisite stress distribution while enabling current sharing between tapes. For instance, can we support conductors and individual tapes inside the conductor and allow current sharing through conductive epoxy [120,121] or solder [122][123][124]? Can we replace the insulation and epoxy and embed the tapes in a media whose electrical resistance decreases with increasing temperature [125]?…”

Section: How To Make High-field Accelerator Magnets Using Multi-tape mentioning

confidence: 99%

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

2019

View full text Add to dashboard Cite

To enable the physics research that continues to deepen our understanding of the Universe, future circular colliders will require a critical and unique instrument—magnets that can generate a dipole field of 20 T and above. However, today’s maturing magnet technology for low-temperature superconductors (Nb-Ti and Nb 3 Sn) can lead to a maximum dipole field of around 16 T. High-temperature superconductors such as REBCO can, in principle, generate higher dipole fields but significant challenges exist for both conductor and magnet technology. To address these challenges, several critical research needs, including direct needs on instrumentation and measurements, are identified to push for the maximum dipole fields a REBCO accelerator magnet can generate. We discuss the research needs by reviewing the current results and outlining the perspectives for future technology development, followed by a brief update on the status of the technology development at Lawrence Berkeley National Laboratory. We present a roadmap for the next decade to develop 20 T-class REBCO accelerator magnets as an enabling instrument for future energy-frontier accelerator complex.

show abstract

Section: How To Make High-field Accelerator Magnets Using Multi-tape mentioning

confidence: 99%

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

2019

View full text Add to dashboard Cite

show abstract

“…Ever since their conception [6], a lot of research has been invested in NI coils. Extensive efforts have for instance been made to control R ct by co-winding various materials [7], by laminating the conductor surface [8] or by impregnating with solder [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K

Harmsel

Otten

Dhallé

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

ReBCO coils are developed as DC field coils in linear motor systems to increase the force density, in favor of permanent magnets. Such coils have to sustain a relatively large heat load stemming from the AC magnetic field environment in which they operate. The use of no or partial turn-to-turn insulation can make them more stable against the effects of local heating. Conversely, the radial electrical connections in no-insulation coils allow for large coupling currents, causing additional AC loss on top of the already significant heat load. Here we report on the AC loss in sub-scale no-insulation, 4 mm wide single-tape, ReBCO racetrack coils exposed to parallel-to-the-tape magnetic field in the frequency range of 10-4 to 1 Hz at 77 K and 4.2 K, while carrying a DC transport current. AC loss is measured magnetically and electrically. The main goal of these experiments is to validate our 2D numerical model, which provides more insight into the origin of the AC loss. At low frequencies, inter-turn coupling currents are spread more or less homogeneously throughout the winding pack. Whereas at high frequencies, the skin effect causes shielding of the interior of the coil and large induced currents only occupy the coil's outer surface.

show abstract

“…However, their mechanical properties are weak and may not contribute too much to the overall mechanical stability of the large high-field magnets [25]. Recent experiments showed that the mechanical stability of no-insulation (NI) HTS coils can be greatly enhanced using the solder impregnation method [26,27]. But the time constant of the solder impregnated coil is large.…”

Section: Introductionmentioning

confidence: 99%

Performance study of a new epoxy resin IR-3 in HTS-based high-field magnet application

Yao¹,

Zhang²,

Wang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

REBCO (Rare-earth-based barium copper oxide) conductors are appropriate materials for high-field magnet applications. Vacuum impregnation using epoxy resin is a technique widely used for stable operation of superconducting coils. However, epoxy-impregnated REBCO coils often experience critical current degradation problems. Finding a suitable impregnating material for REBCO coils is important for their application in high-field superconducting magnets. A new toughness epoxy, IR-3, was developed recently. An in-depth understanding of IR-3 on the performance of REBCO coils is critically necessary for its application. Thus, this paper explores the effects of IR-3 impregnation on the performance of REBCO coils at 77 K and 4.2 K. The test results are compared to similar coils impregnated with CTD-101 K and MY750. Meanwhile, the radial stresses at 77 K in self-field and 4.2 K under 10 T were simulated. All epoxy impregnated REBCO coils showed no decay in critical current after thermal cycles at 77 K. When charged at 4.2 K in external fields of 5 T and 10 T, the IR-3 impregnated REBCO coils avoided performance degradation problems and had superior electrical stabilities. Combing the excellent performance at low temperatures, IR-3 is a promising candidate material for impregnating high-field REBCO coils.

show abstract

Feasibility Study of the Impregnation of a No-Insulation HTS Coil Using Solder

Cited by 26 publications

References 11 publications

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

Effect of a DC transport current on the AC loss in no-insulation ReBCO racetrack coils exposed to AC parallel magnetic field at 77 K and 4.2 K

Performance study of a new epoxy resin IR-3 in HTS-based high-field magnet application

Contact Info

Product

Resources

About