Narrow strand YBCO Roebel cable for lowered AC loss

Long, N.J.; Badcock, Rodney A.; Beck, P.; Mulholl, M; Ross, N; Staines, M.P.; Sun, Hongbo; Hamilton, Julie; Buckley, R. G.

doi:10.1088/1742-6596/97/1/012280

Cited by 68 publications

(60 citation statements)

References 7 publications

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“…One proposed way is to reduce the ROEBEL bar width [17]- [19], the other is the application of a filament structure in the YBCO layer by means of striations, which is still a big challenge and will be one of the new features of the next generation RACC-cables. A further significant reduction of the AC losses is expected.…”

Section: Discussionmentioning

confidence: 99%

Improvement of Superconducting Properties in ROEBEL Assembled Coated Conductors (RACC)

Goldacker

Frank

Kudymow

et al. 2009

IEEE Trans. Appl. Supercond.

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Assembling coated conductors (CC) into flat ROEBEL bars (RACC-cable) is a practical method to reach high transport currents in a low AC loss cable design which is suitable for application in windings. Electrical machinery as large transformers and generators/motors need a few kA transport current. The aim of the presented work was demonstrating the possibility of a strong increase of the transport current of such RACC-cables. So far 1 kA was achieved We present a changed cable design with 3-fold layered strands, an unchanged transposition pitch of 18.8 cm which finally leads to 45 coated conductors in the cable. A 1.1 m long sample (equivalent to 6 transposition lengths) was prepared. Cu stabilized coated conductors purchased from SuperPower were used formatting the ROEBEL strands and assembling the new cable. The new cable reached a record transport current of 2628 A at 77 K in self field (5 V cm criterion).A special feature of the cable was the use of 3 slightly different current carrying ( 10%) batches of strand material. Although current sharing and redistribution effects could be observed, the behavior of the cable was found to be absolutely stable under all operation conditions. The self field degradation of the critical currents, being of the order of 60% at 77 K could be modeled satisfactory by means of a Biot-Savart-Law approach.

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Section: Discussionmentioning

confidence: 99%

Improvement of Superconducting Properties in ROEBEL Assembled Coated Conductors (RACC)

Goldacker

Frank

Kudymow

et al. 2009

IEEE Trans. Appl. Supercond.

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“…These screening currents are also responsible for the diamagnetic behavior of superconductors, known as the Meissner effect (Larbalestier, Gurevich, Feldmann, & Polyanskii, 2001; Uglietti, Yanagisawa, Maeda, & Kiyoshi, 2010). Filamentation and Roebel structures, similar to Litz wires in conventional coils, can reduce such issues (Badcock et al, 2009; Hussennether, Oomen, Leghissa, & Neumüller, 2004; Long et al, 2008). Furthermore, most high-temperature superconductors are brittle and do not withstand the mechanical stress caused by the magnetic forces during a pulse without proper stabilization (Lloberas, et al, 2014).…”

Section: What Are the Major Developments In Tms Technology?mentioning

confidence: 99%

The development and modelling of devices and paradigms for transcranial magnetic stimulation

Goetz

Deng

2017

International Review of Psychiatry

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Magnetic stimulation is a noninvasive neurostimulation technique that can evoke action potentials and modulate neural circuits through induced electric fields. Biophysical models of magnetic stimulation have become a major driver for technological developments and the understanding of the mechanisms of magnetic neurostimulation and neuromodulation. Major technological developments involve stimulation coils with different spatial characteristics and pulse sources to control the pulse waveform. While early technological developments were the result of manual design and invention processes, there is a trend in both stimulation coil and pulse source design to mathematically optimize parameters with the help of computational models. To date, macroscopically highly realistic spatial models of the brain as well as peripheral targets, and user-friendly software packages enable researchers and practitioners to simulate the treatment-specific and induced electric field distribution in the brains of individual subjects and patients. Neuron models further introduce the microscopic level of neural activation to understand the influence of activation dynamics in response to different pulse shapes. A number of models that were designed for online calibration to extract otherwise covert information and biomarkers from the neural system recently form a third branch of modeling.

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“…Roebel cables made from wide Y-123 tapes cut to the required meandered shape have been assembled and tested 13) . They are potential candidates both for high-field quasi-DC applications, and for certain AC applications in view of the reduced AC losses 14) .…”

Section: High-t C Superconductorsmentioning

confidence: 99%

“…However, Bi-2212 is not favored for applications other than magnets, and manufacturers are concentrating on improving the characteristics and increasing the yield of the Y-123 tape due to its better potential for cost reduction. It is therefore indicated to investigate the use of tape conductor for magnets, and in this respect the test results of fully-transposed Roebel cables made from tape are encouraging 13,14) .…”

Section: Magnetsmentioning

confidence: 99%

Application of High <i>T</i><sub>c</sub> Superconductor in Accelerators: Status and Prospects

Ballarino

2009

TEION KOGAKU

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Synopsis:With the continuing improvement of properties of High T c Superconductors (HTS), their application to accelerator technology is becoming increasingly attractive. While the medium to long-term goal for their use in this field will be for high field magnets, the materials now available enable a number of specific applications which benefit from their characteristics and make them a valid alternative to conventional Low T c Superconductors (LTS). If devices for electrical utilities generally seek to use nitrogen as cryogen, large superconducting accelerators rely on helium cryogenics, and allow operating at lower temperatures with consequent gains in electrical performance and temperature margin. After an overview of commercial HTS materials, applications of HTS to accelerators are presented, with examples of present and future use of HTS in the Large Hadron Collider.

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Narrow strand YBCO Roebel cable for lowered AC loss

Cited by 68 publications

References 7 publications

Improvement of Superconducting Properties in ROEBEL Assembled Coated Conductors (RACC)

Improvement of Superconducting Properties in ROEBEL Assembled Coated Conductors (RACC)

The development and modelling of devices and paradigms for transcranial magnetic stimulation

Application of High <i>T</i><sub>c</sub> Superconductor in Accelerators: Status and Prospects

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