Construction and Test of 7-T/68-mm Cold-Bore Multiwidth No-Insulation GdBCO Magnet

Hahn, Seungyong; Song, Jung-Bin; Kim, Young Jae; Lécrevisse, Thibault; Chu, Yong; Voccio, John; Bascuñán, J.; Iwasa, Y.

doi:10.1109/tasc.2014.2363555

Cited by 51 publications

(28 citation statements)

References 10 publications

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“…Hence, if the dedicated electrical insulation can be omitted, there may be significant cost savings and thermal stability improvements. Although there have recently been growing interest of no-insulation coils [21]- [23], allowing direct metal-to-metal contact between turns, this may not be an option due to the long energizing times. Instead, the epoxy attached to the MgB2 wire during winding is used for electrical insulation between turns [24].…”

Section: Coil Fabrication Methodologymentioning

confidence: 99%

Fabrication of a Scaled MgB2 Racetrack Demonstrator Pole for a 10-MW Direct-Drive Wind Turbine Generator

Magnusson

Eliassen

Abrahamsen

et al. 2018

IEEE Trans. Appl. Supercond.

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Abstract-Field windings made of MgB2 wires or tapes are considered for their potential to reduce volume, weight and cost of large offshore wind turbine generators. To gain experience of how to use this relatively new material in full-scale generators, tests of different winding methodologies and techniques are needed. In this paper, we describe in detail the steps used to wind a racetrack coil with a length of 1 m and a width of 0.5 m out of 4.5 km of MgB2 superconducting tape. The width corresponds to a full-scale pole of a 10 MW generator, whereas the length of the straight section is shorter than the corresponding full-scale pole. The coil was built up of 10 double pancake coils. Each double pancake coil was wet-wound using a semi-automatic winding process, where Stycast 2850 was applied directly to the MgB2 tape without any other dedicated electrical insulation. The strengths and weaknesses of the winding process are discussed and compared to the dry-winding method. 

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Section: Coil Fabrication Methodologymentioning

confidence: 99%

Fabrication of a Scaled MgB2 Racetrack Demonstrator Pole for a 10-MW Direct-Drive Wind Turbine Generator

Magnusson

Eliassen

Abrahamsen

et al. 2018

IEEE Trans. Appl. Supercond.

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“…For the case of joule heating in the joints of the 30 DP insert coil, it is assumed that each DP will be linked electrically to adjacent DP's by bridge joints composed of 5 cm long, 10-12 mm wide REBCO tape. To account for variability in DP-DP joint quality and resistivity, as observed in previous REBCO solenoids [7,18], joule heating was estimated using a range of 0.2 െ 2.0 ߤȳ ‫כ‬ ܿ݉ ଶ for the solder joint contact resistivity. Radiative heat loads on the magnet were calculated by implementation of equation ( 4).…”

Section: Stmentioning

confidence: 99%

A cryostat for a 6 T conduction-cooled, no-insulation multi-pancake HTS solenoid

Barkas

Zhai

Safabakhsh

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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There is a growing requirement for high-field (>20 T) magnets capable of continuous operation, driven by the needs of both fundamental research and technological advance, particularly in application to an eventual pilot plant for magnetic confinement fusion. Even with HTS windings, such magnets will still require cryogenic cooling, and liquid helium (LHe) immersion, the typical solution to this problem, adds significantly to the operating expenses of such facilities. This reality makes cryogen-free cooling systems a necessity in future high-field magnet systems. The Princeton Plasma Physics Laboratory (PPPL) is exploring conduction-cooling systems of HTS pancake solenoids for a scanning tunneling microscopy (STM) facility at Princeton University, and potentially also for the central solenoid of the Fusion Nuclear Science Facility (FNSF). To these ends, PPPL is designing a cryostat to evaluate the thermal stability of a 5-6 T, 30 double-pancake (DP) REBCO insert coil of 40 mm ID / 70 mm OD, and smaller prototypes, operated in self-field with conduction cooling provided by a 2-stage GM cryocooler. The current design is expected to achieve 1st and 2nd stage temperatures of 44 K and 4-10 K, respectively, with the resistivity of DP-DP solder joints being the principal source of uncertainty in 2nd stage temperature predictions.

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“…In stand-alone coils wound with coated conductors, axial grading of the critical current (wider tape at the coils ends) is beneficial, because it allows to generate the same field with less material than in a non-graded coil (see for example [33]). The graded magnet in [33] was wound choosing 4.1 mm tapes in the mid-plane pancakes, and increasing the tape width up to 8.1 mm in the pancakes at the magnets ends. The disadvantages of using wide tapes at the magnet ends are large magnetization field and large loss.…”

Section: Stack Of Non-twisted Tapes For Solenoids and Dipolesmentioning

confidence: 99%

Non-twisted stacks of coated conductors for magnets: Analysis of inductance and AC losses

et al. 2020

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Construction and Test of 7-T/68-mm Cold-Bore Multiwidth No-Insulation GdBCO Magnet

Cited by 51 publications

References 10 publications

Fabrication of a Scaled MgB2 Racetrack Demonstrator Pole for a 10-MW Direct-Drive Wind Turbine Generator

Fabrication of a Scaled MgB2 Racetrack Demonstrator Pole for a 10-MW Direct-Drive Wind Turbine Generator

A cryostat for a 6 T conduction-cooled, no-insulation multi-pancake HTS solenoid

Non-twisted stacks of coated conductors for magnets: Analysis of inductance and AC losses

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