Magnetization Measurements of CORC<sup>TM</sup>and Roebel Type YBCO Cables for Accelerators Using a ±3-T Dipole Magnetometer

Kovacs, C.; Majoroš, M.; Sumption, M.D.; Collings, E. W.

doi:10.1109/tasc.2019.2898254

Cited by 9 publications

(8 citation statements)

References 17 publications

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“…Extensive measurements of contact resistance and AC loss made on the Roebel cable are published elsewhere [20]. A recent study [21] on CORC ® cable and Roebel magnetization shows that the magnetization levels measured are significantly larger than that of LTS conductors, which may lead to significant field errors.…”

Section: Introductionmentioning

confidence: 99%

AC loss and contact resistance in REBCO CORC^®, Roebel, and stacked tape cables

Yagotintsev¹,

Anvar²,

Gao³

et al. 2020

Supercond. Sci. Technol.

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Many high-temperature superconductor (HTS) applications require superconducting cables with high currents while operating in an alternating magnetic field. HTS cables should be composed of numerous superconducting tapes to achieve the required current capacity. Alternating current and magnetic fields cause AC losses in such cables and can provoke conductor instability. AC losses and contact resistances were measured of several cable designs based on commercially available REBCO tapes at the University of Twente. The AC loss was measured under identical conditions for eight REBCO conductors manufactured according to three types of cabling methods—CORC® (Conductor on Round Core), Roebel, and stacked tape, including a full-size REBCO CICC (cable in conduit conductor). The measurements were done at T = 4.2 K without transport current in a sinusoidal AC magnetic field of 0.4 T amplitude and frequencies from 5 to 55 mHz. The AC loss was measured simultaneously by calibrated gas flow calorimeter utilizing the helium boil-off method and by the magnetization method using pick-up coils. Also, the AC loss of two CORC® conductors and a Roebel cable was measured at 77 K. Each conductor was measured with and without background field of 1 T. The measured AC coupling loss in the CORC® and Roebel conductors is negligible at 4.2 K for the applied conditions while at 77 K coupling loss was observed for all conductors. The absence of coupling loss at 4.2 K can be explained by shielding of the conductor interior; this is confirmed with measurement and calculation of the penetration field of CORC® and Roebel cables. The inter-tape contact resistance was measured for CORC® and stacked tape samples at 4.2 and 77 K. It was demonstrated that a short heat treatment of CORC® conductor with solder-coated tapes activates tape-to-tape soldering and decreases the contact resistance. The reduction of contact resistance by two orders in magnitude to tens of nΩm is comparable with the interstrand contact resistance in ITER Nb3Sn type conductors.

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Section: Introductionmentioning

confidence: 99%

AC loss and contact resistance in REBCO CORC^®, Roebel, and stacked tape cables

Yagotintsev¹,

Anvar²,

Gao³

et al. 2020

Supercond. Sci. Technol.

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“…Therefore, accurately measuring the AC loss of CORC cables under real operating conditions is imperative. Numerous experimental methods for AC loss determination have been developed, including the calorimetric method [32] and electrical methods [22,23]. However, due to the high specific heat of the ReBCO material and the fact that CORC cables are immersed in liquid nitrogen during testing, temperature rise caused by AC loss is not very pronounced.…”

Section: Ac Loss Measurementmentioning

confidence: 99%

“…For example, as to the AC loss measurement, Li et al carried out the ac loss experiment of CORC cables under different rated current or overcurrent [22]. Kovacs et al used a 3 T dipole magnetometer to measure the magnetization loss of CORC cable [23]. As to the AC losses analysis, Terzioglu et al analyzed eddy current loss of the CORC cable composed of metallic former [24].…”

Section: Introductionmentioning

confidence: 99%

High temperature superconducting CORC cable with variable winding angles for low AC loss and high current carrying SMES system

Zheng,

Cheng,

et al. 2023

Supercond. Sci. Technol.

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Owing to the rising demand for enhanced high-current capacity within superconducting magnetic energy storage (SMES) system used in power grids, there is a growing focus on enhancing the current-carrying capability of SMES setups wound with conductor on round core (CORC) cables. However, it is crucial to note that the dissipation of AC losses in CORC cables during rapid charge and discharge cycles can substantially impact the safe operation of SMES. The CORC cable is crafted by spirally winding numerous ReBCO tapes around copper tubes. Even slight alterations in the winding angles of these tapes can result in shifts at current distribution across the ReBCO tapes, thus leading to differences in AC losses. Hence, the primary objective of this paper is to study the effect of varying winding angles of each ReBCO layer on AC loss. The adoption of variable angles results in the reduction of current flowing through the outermost tapes. And the AC losses in the outermost tapes happen to account for the majority of the total AC losses. Through simulations and experiments, it was observed that the AC loss in the CORC cable with variable angles (4 × 12, 25°–40°) was 25% lower than that in the case of fixed angles (3 × 11, 45°). These findings demonstrate a noteworthy downward trajectory in AC losses when variable angles are applied to the CORC cable. These insights hold significant value for the practical application of CORC cables within SMES systems.

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“…On the other hand, the ROEBEL cable is fairly inflexible when bent in plane of the stacked coated conductors, limiting therefore the range of magnets suitable for this kind of cables. Finally, due to the simplicity and low cost, the CORC ® cable represents the most attractive option regarding to the bending features, as by wounding the 2G-HTS tapes around an elastic rounded-former of e.g., copper or stainless steel, a full transposition of the tapes along the cable length can be obtained [8], [9]. In fact, it has been already proved that CORC ® cables can be wounded in a small diameter coil with high magnetic fields up to 20 T [10], [11].…”

Section: Introductionmentioning

confidence: 99%

3D FEM Modelling of CORC Commercial Cables with Bean's like magnetization currents and its AC-Losses Behaviour

Fareed,

Kapolka,

Robert

et al. 2022

Preprint

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The Conductor on Rounded Core (CORC ® ) cables manufactured by Advanced Conductor Technologies with current densities beyond 300 Amm −2 at 4.2 K, and bending diameter of up to 3.5 cm, are considered as one of the strongest candidates for the next generation of high field power applications and magnets. In this paper, we present a full 3D FEM model for their monolayer and bilayer CORC ® cables made with up to three and six superconducting tapes respectively, disclosing the full curve of AC losses for the monolayer cable at magnetic fields beyond 60 mT, and the actual distribution of current density along and across the thickness of the superconducting tapes in both designs. The model is based on the so-called H-formulation, allowing to incorporate the true three-dimensionality of the tapes without recurring to 2D thin-film approaches where non-physical surface currents that do not follow the celebrated Bean's model for type-II superconductors appear. Likewise, good agreement with the experimentally measured AC-losses for the monolayer and bilayer cable have been obtained, with all the details of the model disclosed in this paper.

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Magnetization Measurements of CORC^TMand Roebel Type YBCO Cables for Accelerators Using a ±3-T Dipole Magnetometer

Cited by 9 publications

References 17 publications

AC loss and contact resistance in REBCO CORC^®, Roebel, and stacked tape cables

AC loss and contact resistance in REBCO CORC^®, Roebel, and stacked tape cables

High temperature superconducting CORC cable with variable winding angles for low AC loss and high current carrying SMES system

3D FEM Modelling of CORC Commercial Cables with Bean's like magnetization currents and its AC-Losses Behaviour

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Magnetization Measurements of CORCTMand Roebel Type YBCO Cables for Accelerators Using a ±3-T Dipole Magnetometer

Cited by 9 publications

References 17 publications

AC loss and contact resistance in REBCO CORC®, Roebel, and stacked tape cables

AC loss and contact resistance in REBCO CORC®, Roebel, and stacked tape cables

High temperature superconducting CORC cable with variable winding angles for low AC loss and high current carrying SMES system

3D FEM Modelling of CORC Commercial Cables with Bean's like magnetization currents and its AC-Losses Behaviour

Contact Info

Product

Resources

About

Magnetization Measurements of CORC^TMand Roebel Type YBCO Cables for Accelerators Using a ±3-T Dipole Magnetometer

AC loss and contact resistance in REBCO CORC^®, Roebel, and stacked tape cables

AC loss and contact resistance in REBCO CORC^®, Roebel, and stacked tape cables