Measurements of the Strain Dependence of Critical Current of Commercial REBCO Tapes at 15 T Between 4.2 and 40 K for High Field Magnets

Pierro, Federica; Delgado, Mario; Chiesa, L.; Wang, Xiaorong; Prestemon, S.

doi:10.1109/tasc.2019.2902458

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…Importantly, there is no discernable difference in degradation between unstrained and strained cables, confirming the results obtained on single REBCO tapes (e.g. [12]) in a full-scale representative 96 tape per channel stacked and soldered cable. The results indicate that VIPER cables are robust to the realistic application of transverse loading and axial strain that would be experienced in high-field REBCO magnets.…”

Section: Experimental Results At Sultansupporting

confidence: 82%

“…Although the strain sensitivities of individual REBCO tapes to tension, torsion, and bending have been widely investigated (e.g. [10][11][12][13][14]), predicting and measuring the strain sensitivity of critical current in REBCO-based cables is still an active area of research and development. Electromagnetic loads on cables within a magnet typically manifest in two orthogonal directions: (1) hoop tension along the conductor axis (parallel to current flow) and (2) transverse loading in the radial direction of the coil (perpendicular to current flow).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous transverse loading and axial strain for REBCO cable tests in the SULTAN facility

Fry¹,

Estrada²,

Michael³

et al. 2022

Supercond. Sci. Technol.

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We present the design and first results of an assembly that enables Rare Earth Barium Copper Oxide (REBCO) superconducting cables –the VIPER cable in this work – to be tested in the SULTAN facility under the simultaneous application of transverse electromechanical loading and axial mechanical strain. The objective is to emulate the loads that a REBCO cable would experience in a three-dimensional coil but in shorter and simpler straight cables, reducing the cost, schedule, and complexity of high-fidelity conductor qualification. The assembly uses two methods for inducing axial strain in the cables. First, hydraulic jacks stretch the assembly and inserted Invar shims lock in up to ~0.3% axial cable strain on the benchtop at room temperature. Second, the different coefficients of thermal expansion between Invar clamps and the copper cable are exploited to induce an additional ~0.3% axial strain on the cable when the sample is cooled in the SULTAN test well from room temperature to below 50 K. FEA modeling shows that the soldered matrix of the VIPER cable transfers approximately 50-60% of the external cable strain into the REBCO stack. The assembly was successfully employed at SULTAN, enabling two VIPER cables to be cycled 500 times at 382 kN/m transverse electromechanical loads with ~0.5% mechanical strain on the cable (corresponding to ~0.3% mechanical strain in the REBCO stacks) demonstrating critical current degradation stabilizing after 30 cycles at less than 5% and providing confidence in VIPER cables under realistic high-field magnet conditions.

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Section: Experimental Results At Sultansupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Simultaneous transverse loading and axial strain for REBCO cable tests in the SULTAN facility

Fry¹,

Estrada²,

Michael³

et al. 2022

Supercond. Sci. Technol.

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“…Grooves for the CORC ® wires following a CCT dipole design Experimental and computational tools are under development to investigate the behavior of REBCO conductors and magnets under stresses (driving question Section 3.3). On the level of single tape, we measure the impact of applied tensile and compressive strains on the critical current of commercial REBCO tapes under high background field up to 15 T and at various temperatures from 4.2 to 40 K, in collaboration with Tufts University [219]. The measured strain dependence can be used to understand the transport performance of REBCO tapes under bending that is required for the fabrication of multi-tape conductors and magnets.…”

Section: Development Of Rebco Magnet Technology At Lbnlmentioning

confidence: 99%

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

2019

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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.

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“…REBCO conductors have the potential to enable magnet operation with peak fields above 15 T, beyond the reach of more conventional Nb 3 Sn conductors like the ones presently used for ITER [3]. To promote REBCO tapes for high field applications, tests have been carried out to study their critical current (I c ) carrying properties as a function of temperature, magnetic field and operational stress/strain conditions [4][5][6][7]. The commercially available 4 mm wide REBCO tapes can operate at 4.2 K and 18 T with a I c of around 300 A.…”

Section: Introductionmentioning

confidence: 99%

Performance of first insert coil with REBCO CICC sub-size cable exceeding 6 kA at 21 T magnetic field

Zhou¹,

Jin²,

Fang³

et al. 2022

Supercond. Sci. Technol.

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The Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP, CAS) is developing the REBCO cable in conduit conductor (CICC) technology for applications in the next generation nuclear fusion device. The aim is a CICC comprising six REBCO sub-cables to satisfy requirements of operation with a current of around 40 kA and a peak field up to 20 T. To qualify the performance of the sub-size REBCO cable to be used in the CICC, two 25-turn insert solenoids have been designed, manufactured and tested at a current exceeding 6 kA subjected in a background field supplied by a water-cooled resistive magnet. The insert solenoid, wound from a 11.5-meter long REBCO CORC cable, was designed to investigate its current carrying capacity under high field and electromagnetic (EM) load at 4.2 K. The background magnetic field amounts up to 18.5 T, resulting in a peak magnetic field on the inner most layer turns of around 21.1 T at an operating current of 6.3 kA. Effects of operation with cyclic EM loads were tested by repeated current ramps to around 95 % of the critical current. Moreover, the V-I characteristics were measured at 77 K and self-field, to check effects from warm-up and cool-down (WUCD) cycles between room temperature and 77 K with liquid nitrogen. The results show no obvious degradation after dozens of high-current test cycles in background fields ranging from 10 T to 18.5 T. The insert solenoid demonstrates stable operation of the REBCO sub-size cable for CICC with EM loads of about 90 kN/m and WUCD cycles between room temperature and 77 K. These promising results indicate the potentials of this technology for further applications, in particular for full-size CICC for high performance Fusion magnets.

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Measurements of the Strain Dependence of Critical Current of Commercial REBCO Tapes at 15 T Between 4.2 and 40 K for High Field Magnets

Cited by 6 publications

References 15 publications

Simultaneous transverse loading and axial strain for REBCO cable tests in the SULTAN facility

Simultaneous transverse loading and axial strain for REBCO cable tests in the SULTAN facility

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

Performance of first insert coil with REBCO CICC sub-size cable exceeding 6 kA at 21 T magnetic field

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