Article
Physics, Applied
Pengbo Zhou, Asef Ghabeli, Mark Ainslie, Francesco Grilli
Summary: Flux pumps provide a solution for contactless charging of HTS coils, and understanding the dynamics of the charging process is essential. This study proposes a methodology for coupling HTS coil and flux pump models using an electrical circuit. Validation of the approach shows good agreement with experimental results, and it is suggested to leave a margin between the operating current and the coil's critical current when using flux pumps.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Daxing Huang, Hongjing Shang, Bowei Xie, Qi Zou, Hao Dong, Kai Wang, Lin Zhang, Hongwei Gu, Fazhu Ding
Summary: This research reports an efficient method for superconducting joints of YBCO coated conductors. By etching microchannels in the YBCO layer, the recovery of critical current in the superconducting joint is accelerated, and a dense joining is formed to enable superconducting current path. This technique can promote the persistent current mode operation of 2G HTS magnets in applications such as magnetic resonance imaging and nuclear magnetic resonance.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Bradley Leuw, Jianzhao Geng, James H. P. Rice, Dominic A. Moseley, Rodney A. Badcock
Summary: A new type of high temperature superconducting (HTS) flux pump has been designed and verified, which utilizes Jc(B) switching to achieve transformer-rectification of the magnetic flux. This technology offers higher electrical power efficiency and overthrows the limitation that traditional HTS flux pumps can only maintain magnetic fields rather than rapidly apply them.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Energy & Fuels
Giacomo Russo, Antonio Morandi
Summary: High Temperature Superconducting (HTS) dynamo flux pumps are a promising alternative to metal current leads for energization and the persistent current mode operation of high current DC superconducting magnet systems. This paper evaluates and compares the performance of several commercial HTS tapes used for flux pumping purposes through numerical simulation, and investigates the dependence of the flux pump's performance on the operating temperatures.
Article
Physics, Applied
Asef Ghabeli, Mark Ainslie, Enric Pardo, Loic Queval, Ratu Mataira
Summary: The high-T-c superconducting dynamo generates a DC voltage using the nonlinear resistivity of an HTS tape when exposed to a varying magnetic field. Two numerical models were used to examine the process of charging a coil by the dynamo, showing excellent agreement with an analytical method. The models captured the dynamic behavior of the charging process, including current ripples that could cause AC loss in the HTS dynamo.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Hong Li, Wei Wang, Xiaojun Niu, Jun Zheng, Yunfei Gao, Hanxin Ye, Yuntian Zhang, Jiafu Wei, Hang Xu, Boyang Shen, Qun Zhou, Xueshan Liu, Yong Lei
Summary: This paper presents the preliminary charging test results of an HTS no-insulated double racetrack coil with the linear-motor type flux pump for a 16.9-kW-class HTS synchronous motor, where the CSED was optimized by testing different wavelengths of flux pumps and superconducting stator wires.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Engineering, Electrical & Electronic
Mark D. Ainslie, Loic Queval, Ratu C. Mataira, Chris W. Bumby
Summary: This study investigates the frequency dependence of a high-Tc superconducting dynamo and proposes a new explanation for the observed phenomenon. Numerical analysis utilizing a finite-element model is used to study the impact of rotation frequency and temperature on the dynamo's open-circuit DC voltage.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Computer Science, Information Systems
Mohammad Yazdani-Asrami, Wenjuan Song, Min Zhang, Weijia Yuan, Xiaoze Pei
Summary: This study investigated the effect of different phase angles and amplitudes of magnetic field harmonics on the magnetization loss of high temperature superconducting coated conductors (CCs), finding that the phase angle of the field harmonic has a significant impact on the magnetization loss.
Article
Engineering, Electrical & Electronic
Hanxin Ye, Wei Wang, Yuntian Zhang, Hong Li, Jiafu Wei, Hang Xu, Qun Zhou, Xueshan Liu, Yong Lei
Summary: This paper presents the fabrication and performance of a linear-motor type flux pump with a pumped current larger than 640 A, which is suitable for MRI magnets and HTS electric machines. The tested results show that this high-temperature superconducting flux pump can output direct current larger than 640 A at 77 K, with advantages such as smaller size and elimination of heat leakage compared to traditional power supplies. Increasing the length of the travelling wave region of this flux pump can potentially reach kilo-ampere level current output. The purpose of this paper is to test the reliability of the methodology for the large current HTS flux pump.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Applied
J. V. J. Congreve, A. R. Dennis, Y. Shi, C. W. Bumby, H. Druiff, D. A. Cardwell, J. H. Durrell
Summary: (English Summary:)
The production of large (RE)Ba-Cu-O single grains is limited by slow grain growth process and limited post-processing techniques. By using single grain YBCO-Ag as an interface medium, a quick and effective joining technique is developed, enabling the production of multiple composite grains with comparable superconducting properties.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Review
Nanoscience & Nanotechnology
Judith L. MacManus-Driscoll, Stuart C. Wimbush
Summary: This review discusses processing methods for the fabrication of REBCO (REBa2Cu3O7-delta) coated conductors, investigating the relation between performance and fabrication method, reviewing existing and new routes to improved performance and outlining emerging and future applications.
NATURE REVIEWS MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Lin Fu, Koichi Matsuda, Boyang Shen, Tim Coombs
Summary: The paper presents updates to the model for a traveling wave HTS electromagnetic flux pump, considering various sources of resistance including joint resistance, superconducting resistance, and dynamic resistance. Experiments were conducted to test the model's fit to the data.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Engineering, Electrical & Electronic
Lin Fu, Koichi Matsuda, Boyang Shen, Tim Coombs
Summary: In recent years, with the continuous development of High-temperature Superconductor (HTS) technology, the performance of HTS tape has been significantly improved. To use HTS instead of Low-temperature Superconductor (LTS) in MRI applications, the flux pumping method has been investigated.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Multidisciplinary
Daxing Huang, Hongjing Shang, Taiguang Li, Bowei Xie, Qi Zou, Hongwei Gu, Zhifeng Ren, Fazhu Ding
Summary: This study presents a novel method to fabricate a superconducting joining between YBCO coated conductors with large current capacities, achieving more than 90% retention of critical current. The use of an Ag layer in the joining strap promotes the recovery of superconductivity during oxygenation annealing, resulting in superior superconducting performance through optimized atomic alignment at the joined YBCO interface.
MATERIALS TODAY PHYSICS
(2021)
Article
Thermodynamics
Seunghak Han, Ji Hyung Kim, Yoon Seok Chae, Sung Hoon Lee, Huu Luong Quach, Tae Kuk Ko, Yong Soo Yoon, Ho Min Kim
Summary: This study proposes a novel contactless superconducting active excitation device (CSAED) to improve the application feasibility of HTS rotating machines in different operational modes. The CSAED, comprising permanent magnets, AC, and DC electromagnets, is developed using the hybrid magnet concept. Experimental analysis demonstrates the effectiveness of the active control functions in the CSAED for stationary, forward, reverse, and compensation operations.
Article
Physics, Applied
Yueming Sun, Shuangrong You, Rodney A. Badcock, Nicholas J. Long, Zhenan Jiang
Summary: In many high-temperature superconducting applications, the dynamic resistance and total loss in REBCO coils carrying DC currents under AC magnetic fields were investigated. Experimental results showed that the DRC had a higher critical current than the DPC, and the magnetization loss was greater than the dynamic loss in both coils. The large perpendicular magnetic field component in the straight sections of the DRC contributed to its higher dynamic loss and magnetization loss.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Yukai Qiao, Yueming Sun, Rodney A. Badcock, Nicholas M. Strickland, Zhenan Jiang
Summary: In some high temperature superconducting (HTS) applications, HTS coated conductors carrying DC current under external AC magnetic field exhibit dynamic resistance. This resistance leads to AC losses, which include dynamic loss and magnetization loss. Conductor on round core (CORC) cables, made up of HTS coated conductors, are attractive for coil applications due to their large current-carrying capability and mechanical flexibility. However, there is no report on dynamic resistance and total loss in CORC cables. In this study, 3D FEM simulations are used to analyze the dynamic resistance and total loss of a spiral tape and three CORC cables, taking into account various parameters such as the number of layers, the amplitude of the AC magnetic field, and the transport DC current levels. The simulation results show that the total loss values in the CORC cables depend on the shielding effect, with the two-layer cable having the lowest loss and highest threshold magnetic field.
Article
Physics, Applied
Xin Zhao, Jin Fang, Zhenan Jiang, Wenjuan Song, Nengwen Liu, Yuan Gao, Xiaohang Li, Fanhui Zeng, Yajun Xia, Rod A. Badcock, Nicholas J. Long, Mike P. Staines, Robert G. Buckley, Xinyu Fang, Yulong Li, Bo Liu, Jinyin Zhang, Wen Han, Li Li, Jin Wang, Peiqing Gao
Summary: This article reports the development progress of a 6.6 MVA high-temperature superconducting traction transformer (HTSTT), which is smaller and lighter than conventional transformers. With the introduction of flux diverters and an optimized winding design, the HTSTT achieved high short-circuit impedance and low AC loss. The insulation structure passed the insulation tests specified in the Chinese standard GB/T 25120-2010. An open cooling system with reduced pressure was developed, resulting in an efficiency above 99% for the HTSTT.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Review
Physics, Applied
Mohammad Yazdani-Asrami, Wenjuan Song, Antonio Morandi, Giovanni De Carne, Joao Murta-Pina, Anabela Pronto, Roberto Oliveira, Francesco Grilli, Enric Pardo, Michael Parizh, Boyang Shen, Tim Coombs, Tiina Salmi, Di Wu, Eric Coatanea, Dominic A. Moseley, Rodney A. Badcock, Mengjie Zhang, Vittorio Marinozzi, Nhan Tran, Maciej Wielgosz, Andrzej Skoczen, Dimitrios Tzelepis, Sakis Meliopoulos, Nuno Vilhena, Guilherme Sotelo, Zhenan Jiang, Veit Grosse, Tommaso Bagni, Diego Mauro, Carmine Senatore, Alexey Mankevich, Vadim Amelichev, Sergey Samoilenkov, Tiem Leong Yoon, Yao Wang, Renato P. Camata, Cheng-Chien Chen, Ana Maria Madureira, Ajith Abraham
Summary: This paper presents a roadmap for applying AI techniques and big data (BD) in various aspects of superconducting applications, such as modelling, design, monitoring, manufacturing, and operation. Short articles are provided to outline potential applications and solutions, aiming to assist researchers, engineers, and manufacturers in understanding the feasibility of using AI and BD techniques to tackle challenges in superconductivity. These potential futuristic routes and their related materials/technologies are considered for a time frame of 10-20 years.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
B. P. P. Mallett, S. Venuturumilli, J. Geng, J. Clarke, B. Leuw, J. H. P. Rice, D. A. Moseley, C. W. Bumby, R. A. Badcock
Summary: This paper presents experimental and modelling results of an ultra-compact self-rectifier flux pump (FP) energizing a superconducting coil. The experiments and modeling together show the importance of dc-flux offsets in the transformer core on the final achievable current through the coil. The miniaturization possible for this class of FP and their minimal heat-leak into the cryogenic environment from thermal conduction make them attractive for applications with demanding size, weight and power limitations.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Yue Wu, Jin Fang, Naoyuki Amemiya, Rodney A. Badcock, Nicholas J. Long, Zhenan Jiang
Summary: The presence of iron cores in high temperature superconducting (HTS) coil windings significantly increases AC loss, but this can be reduced by increasing the distance between the iron cores and coil windings.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Jordan Clarke, Bradley Leuw, Sriharsha Venuturumilli, Ben Mallett, Dominic A. Moseley, Chris Bumby, Rodney A. Badcock
Summary: Transformer-rectifier flux pumps offer an elegant solution for generating high currents in superconducting magnets. By utilizing step-down transformers and superconducting switches, these pumps minimize heat-load during magnet charging. Recent studies have shown the feasibility of J(c)(B) switching, a method that reduces critical current through applied DC magnetic fields. This study presents the first conduction-cooled transformer-rectifier driven by J(c)(B) switching, successfully charging a magnet up to its critical current while monitoring component temperatures and exploring the effects of applied current and switch temperature on charging time and maximum current.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Grant Lumsden, Sarat Singamneni, Bart Ludbrook, Huub Weijers, Rodney A. Badcock
Summary: The Robinson Research Institute at Victoria University Wellington is constructing superconducting motors to showcase technology pathways for the transport industry, specifically aviation. These motors feature rotor-mounted superconducting field coils and a superconducting stator in an air-core configuration. The study explores the use of additively manufactured polymers with various filler materials as structural support for motor coils, and initial testing has been conducted to assess their performance.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Ben George Koshy, Yueming Sun, Rodney A. Badcock, Benjamin P. P. Mallett, Zhenan Jiang
Summary: In this study, the dynamic resistance and total loss of a 4-mm wide Superpower REBCO coated conductor (CC) under varying perpendicular magnetic fields and temperatures are investigated. The results show that the previously developed equations can be used to predict the dynamic resistance, and finite dynamic loss is observed below the threshold magnetic field due to the emergence of resistance. The total loss decreases with increasing temperature, except for a lift-off observed at around 1 T magnetic field.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Swarn S. Kalsi, James G. Storey, Justin M. Brooks, Grant Lumsden, Rodney A. Badcock
Summary: A 100 kW, 4500 RPM synchronous superconducting motor is being developed at the Paihau-Robinson Research Institute. It features superconducting excitation field coils, contactless superconducting dynamo exciter, EM shield, and a unique single-layer winding design. The motor aims to evaluate different technologies and achieve a 3.0 MW machine with superconducting armature and field windings, offering smaller size, lower mass, and higher efficiency compared to permanent magnet motors in the same power range.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Physics, Applied
J. J. Schuyt, O. Duke, D. A. Moseley, B. M. Ludbrook, E. E. Salazar, R. A. Badcock
Summary: This study investigates the effects of gamma irradiation on radiation-induced attenuation (RIA) in photosensitive and radiation-hard fibers at cryogenic temperatures, under different photobleaching conditions. The results show that increasing probe power and using lower wavelength light significantly reduces RIA in both fiber types, with radiation-hard fibers being more resistant. Deconvolution of RIA growth curves reveals that it consists of transient and long-term components related to specific radiation-induced defects in each fiber composition. Ultimately, this study demonstrates effective management of cryogenic RIA in fiber optic sensing systems using radiation-hard fibers and dual-wavelength photobleaching strategies.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Computer Science, Information Systems
Yue Wu, Jin Fang, Naoyuki Amemiya, Rodney A. Badcock, Nicholas J. Long, Zhenan Jiang
Summary: Iron cores are used to enhance the magnetic field in high temperature superconducting power devices, but they increase AC loss in coil windings. To reduce this loss, flux diverters can be applied near the coil windings. Simulation results show that using flux diverters can effectively reduce AC loss in coil assemblies.
Article
Computer Science, Information Systems
Yuan Wang, Jin Fang, Yusuke Sogabe, Rodney A. Badcock, James G. Storey, Zhenan Jiang
Summary: This study numerically investigates the total AC loss and magnetization loss of REBCO tapes under rotating magnetic fields and perpendicular AC standing wave magnetic fields. The results show that the magnetization loss is substantially higher in the perpendicular standing wave compared to the rotating magnetic fields under certain conditions. The study highlights the importance of considering the effects of non-uniform field distribution.
Article
Computer Science, Information Systems
Wenjuan Song, Rodney A. Badcock, Nicholas J. Long, Zhenan Jiang
Summary: To construct large-scale superconducting devices, it is critical to enhance the current carrying capability of superconducting coils. The research found that the AC loss in straight 8/2 TPS and 4/4 ES cables is larger than that in 8/2 Roebel cables. The current in the outer strands of straight 8/2 TPS and 4/4 ES cables is more concentrated, resulting in greater AC loss compared to 8/2 Roebel cables.
