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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Gaifullin, M., S. Lee, J. F. Kelleher, S. Kabra, M. Myronov, B. E. Evans e O. Kirichek. "Influence of mechanical stress on electron transport properties of second-generation high-temperature superconducting tapes". Low Temperature Physics 49, n. 8 (1 agosto 2023): 994–97. http://dx.doi.org/10.1063/10.0020169.

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Second-generation high-temperature superconductor (2G HTS) tapes have demonstrated the ability to generate high magnetic fields and critical currents at a wide operating temperature range. In this paper, we study the mechanical properties of 2G HTS tape measured simultaneously with its critical current. The lattice deformations in the tape’s substrate caused by applied mechanical stress were measured by neutron diffraction. In our experiments, the 2G HTS tape was exposed to uniaxial tensile force ranging from 250 to 1100 N at temperature 77 K. The current through the tape was scanned in the range from 22 to 42 A. The experimental results have been obtained in a cryogenic testing chamber for neutron scattering measurements of internal stresses under load with the incorporated HTS current leads. Critical stress is a vital parameter required for the modeling and designing of advanced superconducting magnets and also a variety of different superconducting applications based on 2G HTS tapes.

2

Wang, Kai, Hao Dong, Daxing Huang, Hongjing Shang, Bowei Xie, Qi Zou, Lin Zhang, Changping Feng, Hongwei Gu e Fazhu Ding. "Advances in second-generation high-temperature superconducting tapes and their applications in high-field magnets". Soft Science 2, n. 3 (2022): 12. http://dx.doi.org/10.20517/ss.2022.10.

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Second-generation high-temperature superconducting (2G-HTS) tapes based on REBa2Cu3O7-x (REBCO, RE: rare earth) materials enable the energy-efficient and high-power-density delivery of electricity, thereby promoting the development of clean energy generation, conversion, transmission, and storage. To overcome the weak grain-boundary connection and poor mechanical properties of these superconductors, a thin-film technology for epitaxy and biaxial textures based on flexible substrates has been developed. In recent years, high-quality 2G-HTS tapes have been produced at the kilometer scale and used in superconducting demonstration projects. This review first summarizes the development of HTS materials and briefly expounds the properties of REBCO superconducting materials. Subsequently, the structural characteristics, preparation methods, and current research progress of 2G-HTS tapes are given. In addition, the applications of REBCO tapes in constructing high-field magnets are also briefly reviewed.

3

Kulikov, I. V., M. Y. Chernykh, T. S. Krylova, A. V. Ovcharov, I. A. Chernykh e M. L. Zanaveskin. "A Superconducting Joint for 2G HTS Tapes". Technical Physics Letters 45, n. 4 (aprile 2019): 324–26. http://dx.doi.org/10.1134/s1063785019040072.

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4

KWOKA, Rafał, Janusz KOZAK e Michał MAJKA. "TESTS OF HTS 2G SUPERCONDUCTING TAPES USING THE LABVIEW ENVIRONMENT". Applied Computer Science 14, n. 1 (30 marzo 2018): 64–72. http://dx.doi.org/10.35784/acs-2018-06.

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HTS 2G superconducting tapes without stabilizer are used for the construction of superconducting fault current limiters. The characteristics R =f(T) of the superconducting tape is essential for design of superconducting current limiters and analysis of their numerical models. The article presents the experimentally determined characteristics R=f(T) of the second generation superconducting tapes SF4050 and SF12050 using the LabVIEW integrated environment. The article describes the method of sample preparation and methodology of testing of HTS 2G superconducting tapes. The LabVIEW integrated environment was used for the testing, thanks to which it was possible to download, process and save measurement data.

5

Yang, Chia-Ming, Yu-Chuan Chang, Chi-Lei Chang e In-Gann Chen. "Sintering Nano-Silver Paste by Resistive Joule Heating Process for 2G HTS Tape Joints". Materials 15, n. 4 (19 febbraio 2022): 1571. http://dx.doi.org/10.3390/ma15041571.

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Developing a joining technology for 2G HTS tapes without significantly reducing their superconducting property is crucial for numerous applications (MRI, motor/generator, power transmission, etc.). In this study, low sintering temperature (~230 °C) nano-silver paste was used as solder to join two 2G HTS tapes. In addition, two heating methods, i.e., furnace heating (heat flux outside-in) and resistive Joule heating (heat flux inside-out), were studied. This study indicates that the heat flux from internal by resistive Joule heating method shows less deteriorating impact to the 2G RE-Ba-Cu-O tape (RE: rare earth element) during the sintering process with the best specific resistance of 0.074 μΩ∙cm2 and Ic retention percentage of 99% (i.e., Ic reduced from 100 A before joining to 99 A after joining). This study indicates that nano-silver paste together with resistive Joule heating can possibly be used as soldering materials to join 2G HTS tapes.

6

Czerwinski, Dariusz, Leszek Jaroszynski, Michal Majka, Janusz Kozak e Barbara Charmas. "Comparison of Overcurrent Responses of 2G HTS Tapes". IEEE Transactions on Applied Superconductivity 26, n. 3 (aprile 2016): 1–4. http://dx.doi.org/10.1109/tasc.2016.2520080.

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7

Vysotsky, V. S., I. P. Radchenko, S. S. Fetisov, V. E. Sytnikov e V. V. Zubko. "Voltage-current characteristics of two soldered 2G HTS tapes". Journal of Physics: Conference Series 234, n. 2 (1 giugno 2010): 022042. http://dx.doi.org/10.1088/1742-6596/234/2/022042.

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8

Hajdasz, Sylwia, Adam Kempski, Krzysztof Solak, Maciej Marc, Jacek Rusinski e Pawel Szczesniak. "Critical Current Degradation in HTS Tapes for Superconducting Fault Current Limiter under Repeated Overcurrent". Applied Sciences 13, n. 7 (29 marzo 2023): 4323. http://dx.doi.org/10.3390/app13074323.

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Superconducting fault current limiters (SFCL) can be an alternative to conventional devices limiting short-circuit currents in power systems. SFCL use high-temperature superconducting tapes of the second generation (HTS 2G) in SFCL, which, after reaching the characteristic critical current of the tape, go into the resistive state (quenching), limiting the short-circuit current. The critical current determines the moment of activation of the SFCL. Therefore, its value should not change during the operation of the device due to repeated limitation of short-circuit currents. The constancy of the critical current is a prerequisite for proper cooperation with the power system protection devices. Multiple quenching can cause microdamage in the superconducting layers responsible for lowering of the value of the critical current of the HTS tapes. The article presents the research results on the degradation processes of 2G HTS tapes intended for the construction of SFCL due to the action of prospective short-circuit currents with values exceeding the critical current of the tested tapes. The decrease in the value of the critical current of the HTS tape as a result of multiple transitions to the resistive state was investigated. The amount of energy emitted during the test current pulse of 0.2 s duration was determined. The limitation values of the voltage drop on the tape, which does not cause accelerated degradation processes, were defined. The microstructural tests of cross-sections of new HTS tapes subjected to prospective short-circuit currents were performed.

9

Chand, Sumit Kumar, Reetu Bharti, Rajesh Kumar, A. K. Satapathy, T. S. Datta e Soumen Kar. "Characterization of SS-Laminated 2G-HTS tapes for SFCL applications". Indian Journal of Cryogenics 45, n. 1 (2020): 138–42. http://dx.doi.org/10.5958/2349-2120.2020.00024.2.

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10

Degtyarenko, A. Yu, E. A. Golovkova, A. S. Ivanov, A. V. Ovcharov e S. V. Krasheninnikov. "Structure of Dispersion-Reinforced Copper Substrate Tapes for 2G HTS". Crystallography Reports 67, n. 2 (aprile 2022): 172–77. http://dx.doi.org/10.1134/s1063774522020031.

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11

Bludova, A. I. "Method for Determining Local Current Density in 2G HTS Tapes". Physics Procedia 71 (2015): 394–400. http://dx.doi.org/10.1016/j.phpro.2015.08.379.

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12

Anand, Ankit, Srikumar Nayek, Abhay Singh Gour e V. V. Rao. "Simulation and Testing of Stacked HTS 2G Tapes for Superconducting Cable". Power Research - A Journal of CPRI 14, n. 2 (12 giugno 2019): 132–37. http://dx.doi.org/10.33686/pwj.v14i2.144714.

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13

Besi Vetrella, U., G. Celentano, M. Marchetti, G. Messina, L. Morici, P. Sabatino, R. Viola e A. della Corte. "HTS Coils Fabrication From Commercial 2G YBCO Tapes: Measurements and Simulation". IEEE Transactions on Applied Superconductivity 24, n. 3 (giugno 2014): 1–4. http://dx.doi.org/10.1109/tasc.2013.2282298.

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14

Kim, Suk Hong, Charles L. Doose, Mark S. Jaski e Matthew T. Kasa. "Feasibility of a Short-Period Superconducting Undulator Using 2G HTS Tapes". IEEE Transactions on Applied Superconductivity 21, n. 3 (giugno 2011): 1709–12. http://dx.doi.org/10.1109/tasc.2010.2089030.

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15

Majkic, Goran, Ibrahim Kesgin, Yue Zhang, Yunfei Qiao, Robert Schmidt e Venkat Selvamanickam. "AC Loss Filamentization of 2G HTS Tapes by Buffer Stack Removal". IEEE Transactions on Applied Superconductivity 21, n. 3 (giugno 2011): 3297–300. http://dx.doi.org/10.1109/tasc.2010.2089416.

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16

Majka, M., e J. Kozak. "Tests of Parallel Connected HTS 2G Tapes for Fault Current Limiters". Acta Physica Polonica A 135, n. 1 (gennaio 2019): 19–23. http://dx.doi.org/10.12693/aphyspola.135.19.

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17

Collomb, David, Min Zhang, Weijia Yuan e Simon J. Bending. "Imaging of Strong Nanoscale Vortex Pinning in GdBaCuO High-Temperature Superconducting Tapes". Nanomaterials 11, n. 5 (22 aprile 2021): 1082. http://dx.doi.org/10.3390/nano11051082.

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Abstract (sommario):

The high critical current density of second-generation high-temperature superconducting (2G-HTS) tapes is the result of the systematic optimisation of the pinning landscape for superconducting vortices through careful engineering of the size and density of defects and non-superconducting second phases. Here, we use scanning Hall probe microscopy to conduct a vortex-resolved study of commercial GdBaCuO tapes in low fields for the first time and complement this work with “local” magnetisation and transport measurements. Magnetic imaging reveals highly disordered vortex patterns reflecting the presence of strong pinning from a dense distribution of nanoscale Gd2O3 second-phase inclusions in the superconducting film. However, we find that the measured vortex profiles are unexpectedly broad, with full-width-half-maxima typically of 6 μm, and exhibit almost no temperature dependence in the range 10–85 K. Since the lateral displacements of pinned vortex cores are not expected to exceed the superconducting layer thickness, this suggests that the observed broadening is caused by the disruption of the circulating supercurrents due to the high density of nanoscale pinning sites. Deviations of our local magnetisation data from an accepted 2D Bean critical state model also indicate that critical state profiles relax quite rapidly by flux creep. Our measurements provide important information about the role second-phase defects play in enhancing the critical current in these tapes and demonstrate the power of magnetic imaging as a complementary tool in the optimisation of vortex pinning phenomena in 2G-HTS tapes.

18

Jae-Ho Kim e S. Pamidi. "Electrical Characteristics of 2G HTS Tapes Under DC Current With AC Ripple". IEEE Transactions on Applied Superconductivity 22, n. 3 (giugno 2012): 5801104. http://dx.doi.org/10.1109/tasc.2012.2185971.

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19

Kang, Jong O., Onyou Lee, Young Kyu Mo, Junil Kim, Seungmin Bang, Hongseok Lee, Jae-Hun Lee, Cheolyeong Jang e Hyoungku Kang. "Degradation characteristics of 2G HTS tapes with respect to an electrical breakdown". Progress in Superconductivity and Cryogenics 17, n. 1 (31 marzo 2015): 48–52. http://dx.doi.org/10.9714/psac.2015.17.1.048.

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20

Shuvalov, D. B., K. E. Barkalov, A. V. Lymar, V. V. Sychugov, P. N. Degtyarenko, S. V. Shavkin e V. S. Kruglov. "Investigation of Electro-physical and Physical-mechanical Properties of HTS 2G Tapes". Physics Procedia 71 (2015): 417–22. http://dx.doi.org/10.1016/j.phpro.2015.08.369.

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21

Zubko, V. V., S. S. Fetisov, S. Yu Zanegin e V. S. Vysotsky. "AC Losses Analysis in stack of 2G HTS tapes in a coil". Journal of Physics: Conference Series 1559 (giugno 2020): 012115. http://dx.doi.org/10.1088/1742-6596/1559/1/012115.

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22

Zhang, Guangyi, Yinshun Wang, Wei Liu, Jian Wang e Jiawen Wang. "Thermal stability of quasi-isotropic strands with different cross-sections and with/without metal sheaths". Superconductor Science and Technology 34, n. 12 (2 novembre 2021): 125013. http://dx.doi.org/10.1088/1361-6668/ac2f02.

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Abstract This paper mainly focuses on the thermal stability performance, such as minimum quench energy (MQE) and normal zone propagation velocity (NZPV), of a quasi-isotropic strand (Q-IS) with three different configurations made from 2G high-temperature superconducting (HTS) tapes in the adiabatic approximation. Due to the anisotropic performance of thermal conductivity in 2G HTS tapes, the tensor form of the heat conduction equation was used instead of conventional isotropic forms. We first measured the MQE and NZPV of three strands in the adiabatic approximation. Subsequently, the experimental results were verified by finite element analysis and compared with the values of MQE and NZPV in a liquid nitrogen (LN2) bath. Finally, the effect of a metal sheath on the current distribution and generation of Joule heat during the quench process were analyzed through simulation. The results show that the arc-shaped aluminum filler brings slightly higher thermal stability of Q-IS while the copper sheath largely improves stability. Moreover, compared with the thermal stability of the strand fully exposed to the LN2 bath, for the strand in the adiabatic approximation, the MQE decreases a lot while the maximum of NZPV is increased by 2–3 times.

23

Ogata, M., K. Mizuno, Y. Arai, H. Hasegawa, T. Sasakawa e K. Nagashima. "Trial Manufacture of Small HTS Magnet Using 2G Tapes for Maglev Train Application". IEEE Transactions on Applied Superconductivity 21, n. 3 (giugno 2011): 1556–59. http://dx.doi.org/10.1109/tasc.2010.2091487.

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24

Machi, Takato, Noriko Chikumoto, Koichi Nakao, Yuji Aoki, Yutaka Kitoh, Hiroshi Fuji, Teruo Izumi, Akira Ibi e Yutaka Yamada. "Development of a magneto-optical imaging equipment for long length 2G-HTS tapes". Physica C: Superconductivity and its Applications 445-448 (ottobre 2006): 673–76. http://dx.doi.org/10.1016/j.physc.2006.06.043.

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25

Degtyarenko, Pavel N., Vladimir V. Zheltov, Nikolay N. Balashov, Andrey Yu Arkhangelsky, Alena Yu Degtyarenko e Konstantin L. Kovalev. "Fault Current Limitation in Electrical Power Networks Containing HTS Cable and HTS Fuse". Materials 15, n. 24 (8 dicembre 2022): 8754. http://dx.doi.org/10.3390/ma15248754.

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Abstract (sommario):

Numerical calculations of parameters of an electrical power network where an HTS fuse is used as a fault current limiting device have been done. The calculations were performed for networks containing different types of HTS cables as well. The design of HTS fuse was developed based on the numerical calculation for the network-rated parameters considering the special types 2G HTS tape characteristics. The distinctive feature of these tapes is the minimal thickness (about 30 µm) of the substrate at the critical current 450–600 A. The tests were performed at a voltage of 1 kV and demonstrated the ability of circuit breaking at fault currents about 3–4 kA. A comparison of experimental results with the calculations allows us to conclude that the HTS fuse of this design can operate as a fault current limiting device in electrical power networks at various rated voltage levels.

26

Porta-Velilla, Luis, Neslihan Turan, Álvaro Cubero, Wei Shao, Hongtao Li, Germán F. de la Fuente, Elena Martínez et al. "Highly Regular Hexagonally-Arranged Nanostructures on Ni-W Alloy Tapes upon Irradiation with Ultrashort UV Laser Pulses". Nanomaterials 12, n. 14 (12 luglio 2022): 2380. http://dx.doi.org/10.3390/nano12142380.

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Nickel tungsten alloy tapes (Ni—5 at% W, 10 mm wide, 80 µm thick, biaxially textured) used in second-generation high temperature superconductor (2G-HTS) technology were laser-processed in air with ultraviolet ps-laser pulses (355 nm wavelength, 300 ps pulse duration, 250–800 kHz pulse repetition frequency). By employing optimized surface scan-processing strategies, various laser-generated periodic surface structures were generated on the tapes. Particularly, distinct surface microstructures and nanostructures were formed. These included sub-wavelength-sized highly-regular hexagonally-arranged nano-protrusions, wavelength-sized line-grating-like laser-induced periodic surface structures (LIPSS, ripples), and larger irregular pyramidal microstructures. The induced surface morphology was characterized in depth by electron-based techniques, including scanning electron microscopy (SEM), electron back scatter diffraction (EBSD), cross-sectional transmission electron microscopy (STEM/TEM) and energy dispersive X-ray spectrometry (EDS). The in-depth EBSD crystallographic analyses indicated a significant impact of the material initial grain orientation on the type of surface nanostructure and microstructure formed upon laser irradiation. Special emphasis was laid on high-resolution material analysis of the hexagonally-arranged nano-protrusions. Their formation mechanism is discussed on the basis of the interplay between electromagnetic scattering effects followed by hydrodynamic matter re-organization after the laser exposure. The temperature stability of the hexagonally-arranged nano-protrusion was explored in post-irradiation thermal annealing experiments, in order to qualify their suitability in 2G-HTS fabrication technology with initial steps deposition temperatures in the range of 773–873 K.

27

Bykovsky, N. V., S. S. Fetisov, A. A. Nosov, V. V. Zubko e V. S. Vysotsky. "Analysis of critical current reduction in self-field in stacked twisted 2G HTS tapes". Journal of Physics: Conference Series 507, n. 2 (12 maggio 2014): 022001. http://dx.doi.org/10.1088/1742-6596/507/2/022001.

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28

Duan, Yujie, Wurui Ta e Yuanwen Gao. "Numerical models of delamination behavior in 2G HTS tapes under transverse tension and peel". Physica C: Superconductivity and its Applications 545 (febbraio 2018): 26–37. http://dx.doi.org/10.1016/j.physc.2017.11.012.

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29

Abin, D. A., I. A. Rudnev, M. A. Osipov e R. G. Batulin. "Influence of annealing on the critical current of 2G HTS tapes irradiated Fe ions". Superconductivity: Fundamental and Applied Research, n. 1 (dicembre 2023): 22–30. http://dx.doi.org/10.62539/2949-5644-2023-0-1-22-30.

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Современные высокотемпературные сверхпроводящие (ВТСП) ленты востребованы для изготовления мощных электромагнитов токамаков. В силу конструкционных особенностей ВТСП материал будет находится в радиационном поле продуктов распада термоядерной реакции, а конкретно будет подвержен влиянию нейтронов с энергией около 14 МэВ, что приводит к накоплению дефектов и деградации критических характеристик. В данной статье рассматривается отжиг облучённой ионами ленты (имитационное облучение) с открытым ВТСП слоем как способ восстановления характеристик за счёт частичной рекомбинации накопленных дефектов. Показано, что облучение ионами Fe2+ приводит к уменьшению величины критического тока в 2-3,5 раза, а последующий отжиг при температуре 180-210°С, позволяет поднять критический ток на 30-40% относительно тока облучённой ленты.

30

Самойленков, С. В., В. И. Щербаков, Д. Р. Кумаров e Д. А. Горбунова. "Зависимость нагрева стабилизированных нержавеющей сталью токоограничивающих элементов на основе ВТСП-лент второго поколения от воздействия тока и параметров теплоотвода на границе с жидким азотом". Письма в журнал технической физики 46, n. 1 (2020): 28. http://dx.doi.org/10.21883/pjtf.2020.01.48860.18047.

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Fault current heating of the current limiting modules made of 2G HTS tapes and stabilized with stainless steel was studied. It is demonstrated that the speed of current limiting element heating hardly depends on the degree of the stainless steel stabilization. The ways to improve the heat transfer with the help of the increase of the elements’ surface area were demonstrated with the use of a mathematical model taking into account parameters of heat transfer to liquid nitrogen.

31

Sotnikov, Dmitry V., Sergey S. Fetisov, Irlama P. Radchenko, Vsevolod N. Chepikov, Sergey V. Samoilenkov, Dmitry P. Bykovsky e Vitaly S. Vysotsky. "Possible Reasons of Lorentz Force Direction Influence on Anisotropy of 2G HTS Tapes Critical Currents". IEEE Transactions on Applied Superconductivity 26, n. 3 (aprile 2016): 1–4. http://dx.doi.org/10.1109/tasc.2016.2518024.

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32

Llambes, J. C., D. Hazelton, J. Duval, M. Albertini, S. Repnoy, V. Selvamanickam, G. Majkic et al. "Performance of 2G HTS Tapes in Sub-Cooled LN2 for Superconducting Fault Current Limiting Applications". IEEE Transactions on Applied Superconductivity 21, n. 3 (giugno 2011): 1206–8. http://dx.doi.org/10.1109/tasc.2010.2101572.

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Minaev, I. M., A. V. Troitskii, A. V. Ponomarev, I. V. Anischenko, S. V. Pokrovskii, I. A. Rudnev e G. N. Mikhailova. "GdBCO (123) HTS 2G tapes superconducting characteristics investigation under the pulsed electron beam exposure impact". Journal of Physics: Conference Series 1347 (dicembre 2019): 012026. http://dx.doi.org/10.1088/1742-6596/1347/1/012026.

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Kim, Ji Hyung, Thanh Dung Le, Do Jin Kim, Chang-Jin Boo, Young-Sik Jo, Yong Soo Yoon, Kyung Yong Yoon e Ho Min Kim. "Economic Analysis of a 1.5-MW-Class HTS Synchronous Machine Considering Various Commercial 2G CC Tapes". IEEE Transactions on Applied Superconductivity 26, n. 4 (giugno 2016): 1–5. http://dx.doi.org/10.1109/tasc.2016.2521408.

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35

Núñez-Chico, A. B., E. Martínez, L. A. Angurel e R. Navarro. "Enhanced quench propagation in 2G-HTS coils co-wound with stainless steel or anodised aluminium tapes". Superconductor Science and Technology 29, n. 8 (30 giugno 2016): 085012. http://dx.doi.org/10.1088/0953-2048/29/8/085012.

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36

Zhang, X., Z. Zhong, J. Geng, B. Shen, J. Ma, C. Li, H. Zhang, Q. Dong e T. A. Coombs. "Study of Critical Current and n-Values of 2G HTS Tapes: Their Magnetic Field-Angular Dependence". Journal of Superconductivity and Novel Magnetism 31, n. 12 (24 aprile 2018): 3847–54. http://dx.doi.org/10.1007/s10948-018-4678-8.

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37

Surdacki, Paweł, e Łukasz Woźniak. "Influence of the HTS Winding Tape on Limiting the Transient Currents in Superconducting Transformers". Energies 15, n. 5 (24 febbraio 2022): 1688. http://dx.doi.org/10.3390/en15051688.

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Abstract (sommario):

The article presents an extended computer model of a HTS (high temperature superconducting) 21 MVA 70/10.5 kV transformer with severalfold compound windings, based on a verified PSpice model of 10 kVA transformer with single windings. Two superconducting tapes: SCS12050 (with a copper stabiliser layer) and SF12050 (without a stabiliser) were used in the windings. The circuit model of the transformer developed in the PSpice environment considers Rhyner’s power law and the Jiles–Atherton description of the magnetic hysteresis loop. Two types of transient states were analysed: switching on a superconducting transformer to the network and an emergency short-circuit of the secondary winding. For the first five unidirectional current pulses generated when connecting an unloaded transformer to the network, the values of the pulse duration (γ angle), the temperature increase in the primary winding as well as the mean and effective values of the switch-on current were calculated. The waveforms of currents, voltages, changes in resistance and temperature during the operation short-circuit were compared for the windings with both types of HTS 2G (high temperature superconductor second generation) tapes. The conducted analysis allowed us to determine the influence of electrical and thermal parameters of the tapes in question on the effective limitation of current in transient states and the possibility of their use in the construction of superconducting transformer windings.

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Robert, Bright Chimezie, Muhammad Umar Fareed e Harold Steven Ruiz. "How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils". Materials 12, n. 17 (22 agosto 2019): 2679. http://dx.doi.org/10.3390/ma12172679.

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In an attempt to unveil the impact of the material law selection on the numerical modelling and analysis of the electromagnetic properties of superconducting coils, in this paper we compare the four most common approaches to the E-J power laws that serve as a modelling tool for the conductivity properties of the second generation of high-temperature superconducting (2G-HTS) tapes. The material laws considered are: (i) the celebrated E-J critical-state like-model, with constant critical current density and no dependence with the magnetic field; (ii) the classical Kim’s model which introduces an isotropic dependence with the environment magnetic field; (iii) a semi-empirical Kim-like model with an orthonormal field dependence, J c ( B ) , widely used for the modelling of HTS thin films; and (iv) the experimentally measured E–J material law for SuperPower Inc. 2G-HTS tapes, which account for the magneto-angular anisotropy of the in-field critical current density J c ( B ; θ ) , with a derived function similar to Kim’s model but taking into account some microstructural parameters, such as the electron mass anisotropy ratio ( γ ) of the superconducting layer. Particular attention has been given to those physical quantities which within a macroscopic approach can be measured by well-established experimental setups, such as the measurement of the critical current density for each of the turns of the superconducting coil, the resulting distribution of magnetic field, and the curve of hysteretic losses for different amplitudes of an applied alternating transport current at self-field conditions. We demonstrate that although all these superconducting material laws are equally valid from a purely qualitative perspective, the critical state-like model is incapable of predicting the local variation of the critical current density across each of the turns of the superconducting coil, or its non-homogeneous distribution along the width of the superconducting tape. However, depending on the physical quantity of interest and the error tolerance allowed between the numerical predictions and the experimental measurements, in this paper decision criteria are established for different regimes of the applied current, where the suitability of one or another model could be ensured, regardless of whether the actual magneto angular anisotropy properties of the superconducting tape are known.

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Kesgin, Ibrahim, George A. Levin, Xinwei Cai, Xiao-Fen Li, Timothy J. Haugan e Venkat Selvamanickam. "Influence of Oxygenation in Copper Stabilized Multifilamentary 2G HTS Tapes Made by Selective Electroplating and Laser Ablation". IEEE Transactions on Applied Superconductivity 25, n. 3 (giugno 2015): 1–5. http://dx.doi.org/10.1109/tasc.2014.2366372.

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Voccio, J., Jae-Ho Kim e S. Pamidi. "Study of AC Losses in a 1-m Long, HTS Power Cable Made From Wide 2G Tapes". IEEE Transactions on Applied Superconductivity 22, n. 3 (giugno 2012): 5800304. http://dx.doi.org/10.1109/tasc.2011.2177050.

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Kim, J., W. S. Lee, H. Jin e T. K. Ko. "Critical current characteristic of various 2G HTS multi-stacked tapes depending on the low external magnetic field". Progress in Superconductivity and Cryogenics 16, n. 1 (31 marzo 2014): 27–31. http://dx.doi.org/10.9714/psac.2014.16.1.027.

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Sychugov, V. V., P. N. Degtyarenko, A. V. Ovcharov, S. V. Shavkin, V. S. Kruglov, A. L. Vasiliev, P. V. Volkov e Yu M. Chesnokov. "Variation of critical current andn-value of 2G HTS tapes in external magnetic fields of different orientation". Journal of Physics: Conference Series 747 (settembre 2016): 012048. http://dx.doi.org/10.1088/1742-6596/747/1/012048.

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Zampa, Alexandre, Sigrid Holleis, Arnaud Badel, Pascal Tixador, Johannes Bernardi e Michael Eisterer. "Influence of Local Inhomogeneities in the REBCO Layer on the Mechanism of Quench Onset in 2G HTS Tapes". IEEE Transactions on Applied Superconductivity 32, n. 3 (aprile 2022): 1–7. http://dx.doi.org/10.1109/tasc.2022.3151950.

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Li, Zhuyong, Daoyu Hu, L. Zhang, Z. Xie, L. Sun, B. Liu, Zhiyong Hong, Zhijian Jin e K. Ryu. "Development of a Novel Soldered-Stacked-Square (3S) HTS Wire Using 2G Narrow Tapes With 1 mm Width". IEEE Transactions on Applied Superconductivity 27, n. 4 (giugno 2017): 1–4. http://dx.doi.org/10.1109/tasc.2016.2634326.

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Kim, Junil, Young Kyu Mo, Onyou Lee, Seungmin Bang, Hongseok Lee e Hyoungku Kang. "Deterioration Characteristics of 2G HTS Tapes with Respect to Electrical Breakdown for Designing a High-Voltage Superconducting Apparatus". Journal of Superconductivity and Novel Magnetism 30, n. 11 (3 settembre 2016): 3271–75. http://dx.doi.org/10.1007/s10948-016-3776-8.

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Lu, Li, Wei Wu, Xin Yu e Zhijian Jin. "High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System". Electronics 10, n. 16 (17 agosto 2021): 1980. http://dx.doi.org/10.3390/electronics10161980.

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Abstract (sommario):

The null-flux electro-dynamic suspension (EDS) system is a feasible high-speed maglev system with speeds of above 600 km/h. Owing to their greater current-carrying capacity, superconducting magnets can provide a super-magnetomotive force that is required for the null-flux EDS system, which cannot be provided by electromagnets and permanent magnets. Relatively mature high-speed maglev technology currently exists using low-temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T ⩽ 4.2 K). Second-generation (2G) high-temperature superconducting (HTS) magnets wound by REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes work above the 20 K region and do not rely on liquid helium, which is rare on Earth. In this study, the HTS non-insulation closed-loop coils module was designed for an EDS system and excited with a persistent current switch (PCS). The HTS coils module can work in the persistent current mode and exhibit premier thermal quenching self-protection. In addition, a full-size double-pancake (DP) module was designed and manufactured in this study, and it was tested in a liquid nitrogen (LN2) environment. The critical current of the DP module was approximately 54 A, and it could work in the persistent current mode with an average decay rate measured over 12 h of 0.58%/day.

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Sotelo, Guilherme Goncalves, Miquel Carrera, Josep Lopez-Lopez e Xavier Granados. "H-Formulation FEM Modeling of the Current Distribution in 2G HTS Tapes and Its Experimental Validation Using Hall Probe Mapping". IEEE Transactions on Applied Superconductivity 26, n. 8 (dicembre 2016): 1–10. http://dx.doi.org/10.1109/tasc.2016.2591825.

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Kozak, Sławomir. "Superconducting Surge Current Limiter". Energies 14, n. 21 (22 ottobre 2021): 6944. http://dx.doi.org/10.3390/en14216944.

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Abstract (sommario):

A superconducting fault current limiter (SFCL) for medium voltage networks cooled by a cryocooler was designed, built and tested by the current author. For the construction of this limiter, a high-temperature second generation superconducting tape (HTS 2G)—SF12100—was used. In this limiter, it is possible to change the working temperature. The possibility of changing the operating temperature allows for adjusting the parameters of the limiter to the electric power needs. Adjusting the parameters of the limiter to the power needs is a key problem to solve, resulting from the ambiguous characteristics of HTS tapes. Cooling with a cryocooler is the only solution in the case of a limiter for power industry applications. The electric power mechanism does not tolerate any liquids. After analyzing the experimental results and after analyzing the results from the numerical models of the limiter, the concepts of using superconductors to limit current in the power industry were changed: the transition from a superconducting fault current limiter (SFCL) to a superconducting surge current limiter (SSCL). Transition to the limiter operation system—surge current limitation—is associated with the reduction in the limiter operation time. The advantages of the transition from the SFCL to SSCL work system are presented.

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Kondratowicz-Kucewicz, Beata, e Grzegorz Wojtasiewicz. "The Proposal of a Transformer Model With Winding Made of Parallel 2G HTS Tapes With Transpositioners and its Contact Cooling System". IEEE Transactions on Applied Superconductivity 28, n. 4 (giugno 2018): 1–5. http://dx.doi.org/10.1109/tasc.2018.2807585.

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Jiang, Guangyu, Yue Zhao, Jiamin Zhu, Yiming Hong, Chunsheng Chen, Sikan Chen, Yue Wu et al. "Recent development and mass production of high J e 2G-HTS tapes by using thin hastelloy substrate at Shanghai Superconductor Technology". Superconductor Science and Technology 33, n. 7 (8 giugno 2020): 074005. http://dx.doi.org/10.1088/1361-6668/ab90c4.

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