Characterization of the Critical Current Capabilities of Commercial REBCO Coated Conductors for an HTS Cable-in-Conduit Conductor

Marzi, Gianluca De; Celentano, G.; Augieri, A.; Muzzi, L.; Tomassetti, G.; Corte, A. della

doi:10.1109/tasc.2014.2373651

Cited by 19 publications

(7 citation statements)

References 17 publications

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“…ENEA HTS CICC consists of stacked superconducting tapes that are placed into the helical grooves (five bundles) of an aluminum slotted core. The design, manufacturing process, and the results of critical current measurements of the HTS CICC are published in [5,6,19]. Extensive measurements of contact resistance and AC loss made on the Roebel cable are published elsewhere [20].…”

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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“…As an example, in figure 1 the n-index are plotted as a function of applied magnetic field, μ 0 H, for the SuNAM CC tape. The n-index has been found to be a decreasing function of μ o H. At higher temperatures, the n-index (sf) values decrease from n=30-40 to n=5-10, whereas at 4.2 K the n-index does not change in the field range [5][6][7][8][9][10][11][12][13][14] T. In figure 2 the critical current density, J c (B), is plotted as a function of the applied magnetic field. Here the DC transport measurements and the VSM magnetization measurements are compared.…”

Section: Resultsmentioning

confidence: 99%

“…Here the DC transport measurements and the VSM magnetization measurements are compared. The major magnetization loops have been used to calculate the field dependence of the critical current density, J c (B), to be used in equation (8), through the Bean model formula [7]:…”

Section: Resultsmentioning

confidence: 99%

“…with E c a conveniently chosen electrical field criterion, usually in the range between 10 −4 and 10 −5 V m −1 , and J c (B,Τ) the magnetic field dependence of the critical current density at a given temperature Τ. The reader can refer to [8] for experimental details. Isothermal magnetization loops have been measured by means of an Oxford MAGLAB vibrating sample magnetometer system (VSM) provided with a 12 T superconducting magnet and a variable temperature insert (VTI).…”

Section: Tapementioning

confidence: 99%

“…In critical state models, J c (B; Τ) can be kept constant (Bean model [9]) or can be defined analytically (fixed pinning [10], square root [11], Kim [12], exponential models [13]). In equation (8), the behavior of the critical current density as a function of field is taken into account by using the experimental J c (B) curves obtained from the full magnetization cycles within the framework of the critical state model, with the required finite size corrections [7].…”

Section: Computational Detailsmentioning

confidence: 99%

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Magnetic losses of commercialREBCO coated conductors in the low frequency range

Marzi¹,

Iannone²,

Gambardella³

2018

Supercond. Sci. Technol.

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We have investigated the frequency dependence of the magnetic losses of different 2 G commercial REBCO coated-conductor tapes in the low frequency range ∼1-10 mHz of applied magnetic field at 5 and 77 K. We explored high field range, well above the penetration field, with fields applied perpendicularly to the flat surface. We found that the in-field hysteresis losses increase with increasing frequencies in all the investigated high-temperature superconductor (HTS) tapes, following a power-law dependence. An electromagnetic 2D finite element method model, based on H-formulation, has also been implemented, in which the frequency dependence of the hysteretic loss is computed taking into account the measured power-law E(J) characteristic for the electric field, and the experimental J c (B). Experimental and numerical findings are in very good agreement, so an extrapolation to higher ramp rate values is possible, thus providing a useful basis for the assessment of the hysteresis losses in fusion and accelerator HTS magnets.

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