Investigation of a Rutherford cable using coated conductor Roebel cables as strands

Kario, A.; Vojenčiak, M; Grilli, Francesco; Kling, A.; Ringsdorf, B.; Walschburger, U.; Schlachter, S.I.; Goldacker, W.

doi:10.1088/0953-2048/26/8/085019

Cited by 47 publications

(36 citation statements)

References 14 publications

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“…Overall engineering critical-current density J e was 117 A/mm 2 for the present conductor considering an overall averaged diameter of 8.1 mm. If only the conductor cross-section of 4 mm x 4 mm is considered, J e is estimated to be 375 A/mm 2 . If the circular envelop of the TSTC conductor (5.7 mm diameter) is considered, then J e is 239 A/mm 2 .…”

Section: ) Fourth Pentagon Samplementioning

confidence: 99%

Present Status and Recent Developments of the Twisted Stacked-Tape Cable Conductor

Takayasu

Chiesa

Allen

et al. 2016

IEEE Trans. Appl. Supercond.

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High magnetic field performance of a 40-tape Twisted Stacked-Tape Cable (TSTC) conductor made of 4 mm width, 0.1 mm thick REBCO tapes was successfully tested. The critical current was 6.0 kA with the n-value of 35 at 4.2 K with a background field of 17 T. No-cyclic load effect was observed between 10 T and 17 T with the maximum Lorentz load of 102 kN/m. Various issues such as sample length, non-uniformity of termination resistances, soldered joint of a coated tape cable with regards to a TSTC conductor are discussed. Large-scale conductor designs of various scalable TSTC conductors are discussed taking into account current densities and stabilizers.

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Section: ) Fourth Pentagon Samplementioning

confidence: 99%

Present Status and Recent Developments of the Twisted Stacked-Tape Cable Conductor

Takayasu

Chiesa

Allen

et al. 2016

IEEE Trans. Appl. Supercond.

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“…Tapes with different numbers of filaments oriented with the superconducting layer on the inside were tested using off-axis bending equipmentfigure 4. This equipment allows bending the tape over a chosen former (in this case 5 mm diameter) and changing the winding angle, as described in more detail in [16]. Tapes with 3 (circles), 5 (squares) and 7 filaments (triangles) with edges were measured; a sample with 5 filaments was measured without the edge as well (diamonds).…”

Section: Off-axis Bending Experimentsmentioning

confidence: 99%

Magnetization ac loss reduction in HTS CORC^®cables made of striated coated conductors

Vojenčiak

Kario

Ringsdorf

et al. 2015

Supercond. Sci. Technol.

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High temperature superconductors (HTSs), like for instance REBCO (RE=rare earth) coated conductors, are of high potential for building large superconducting magnets. Some magnets, such as accelerator magnets, require the use of superconducting cables to allow fast ramping, and low magnetization loss to mitigate field quality issues. One of the methods to lower ac loss is to divide the superconducting layer in the tape into filaments. In this paper, conductors with copper stabilization for practical applications are laser scribed into narrow filaments. Striated tapes are then wound into conductor on round core (CORC ® ) cables. The critical current and magnetization ac loss of single tapes were measured. We found that the stabilizing copper layer causes difficulties for laser scribing. The degradation of the critical current is more pronounced than in the case of non-stabilized tapes. The selection of the number of filaments is therefore a compromise between critical current degradation and reduction of ac loss. Based on the results obtained from single tape experiments, the optimum number of filaments in 4 mm wide tapes was chosen, and CORC ® cables with 2, 3 and 4 layers of tapes with and without filaments were manufactured. Magnetization ac loss measurements at 77 K showed a reduction of ac loss in the cables with filaments. This reduction corresponds almost to the number of filaments. Measurement at different frequencies also showed that the coupling loss in CORC ® cables with a short twist-pitch is relatively small in comparison to hysteretic loss.

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“…Coated Conductor Rutherford Cables (CCRC) are being developed at the Karlsruhe Institute of Technology (KIT), Germany [3,4].…”

Section: High Temperature Superconductor Cable Conceptsmentioning

confidence: 99%

Temperature- and field-dependent characterization of a conductor on round core cable

Barth

Laan

Bagrets

et al. 2015

Supercond. Sci. Technol.

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The Conductor on Round Core (CORC) cable is one of the major high temperature superconductor cable concepts combining scalability, flexibility, mechanical strength, ease of fabrication and high current density; making it a possible candidate as conductor for large, high field magnets. To simulate the boundary conditions of such magnets as well as the temperature dependence of Conductor on Round Core cables a 1.16 m long sample consisting of 15, 4 mm wide SuperPower RE BCO tapes was characterized using the "FBI" (force -fieldcurrent) superconductor test facility of the Institute for Technical Physics (ITEP) of the Karlsruhe Institute of Technology (KIT). In a five step investigation, the CORC cable's performance was determined at different transverse mechanical loads, magnetic background fields and temperatures as well as its response to swift current changes. In the first step, the sample's 77 K, self-field current was measured in a liquid nitrogen bath. In the second step, the temperature dependence was measured at self-field condition and compared with extrapolated single tape data. In the third step, the magnetic background field was repeatedly cycled while measuring the current carrying capabilities to determine the impact of transverse Lorentz forces on the CORC cable sample's performance. In the fourth step, the sample's current carrying capabilities were measured at different background fields (2 -12 T) and surface temperatures (4.2 -51.5 K). Through finite element method (FEM) simulations, the surface temperatures are converted into average sample temperatures and the gained field-and temperature dependence is compared with extrapolated single tape data. In the fifth step, the response of the CORC cable sample to rapid current changes (8.3 kA s −1 ) was observed with a fast data acquisition system. During these tests, the sample performance remains constant, no degradation is observed. The sample's measured current carrying capabilities correlate to those of single tapes assuming field-and temperature dependence as published by the manufacturer.

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Investigation of a Rutherford cable using coated conductor Roebel cables as strands

Cited by 47 publications

References 14 publications

Present Status and Recent Developments of the Twisted Stacked-Tape Cable Conductor

Present Status and Recent Developments of the Twisted Stacked-Tape Cable Conductor

Magnetization ac loss reduction in HTS CORC^®cables made of striated coated conductors

Temperature- and field-dependent characterization of a conductor on round core cable

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Investigation of a Rutherford cable using coated conductor Roebel cables as strands

Cited by 47 publications

References 14 publications

Present Status and Recent Developments of the Twisted Stacked-Tape Cable Conductor

Present Status and Recent Developments of the Twisted Stacked-Tape Cable Conductor

Magnetization ac loss reduction in HTS CORC®cables made of striated coated conductors

Temperature- and field-dependent characterization of a conductor on round core cable

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Product

Resources

About

Magnetization ac loss reduction in HTS CORC^®cables made of striated coated conductors