Magnetization Method Design of Bulk Multi-Seeded High Temperature Superconductors

2013 ◽  
Vol 745-746 ◽  
pp. 185-190 ◽  
Author(s):  
Hai Lian Jing ◽  
Jun Zheng ◽  
Xing Lin Liao ◽  
Zi Gang Deng ◽  
Xin Chen ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Middle Domain ◽  
Trapped Flux ◽  
Melt Texture ◽  
Trapping Performance ◽  
The Magnetic Field ◽  
Ybacuo Bulk ◽  
Hts Magnet ◽  
Current Experimental Setup

The potential application of bulk high temperature superconductor (HTS) magnets has attracted much attention because of the potential high trapped flux in HTS magnets. This paper focuses on the magnetization method design of bulk multi-seeded HTS magnets for obtaining their better flux-trapping performance. Firstly, three different magnetization methods were carried out based on the current experimental setup to find a better way of magnetizing a bulk melt-texture three-seeded YBaCuO superconductor. The experimental results indicated that when the three domains of this three-seeded YBaCuO bulk were magnetized in order, the maximum trapped flux was higher than that when only one domain was magnetized. However, this method costs about three times of the magnetization time than the other two methods and the increasing ratio was only about 11.11%. It has been found that another method of magnetizing only the middle domain could also get a good result such as the uniformity of trapped flux is good. In order to improve the current experimental magnetization conditions for further improvement, two sheets of iron were designed to attach two poles of the electromagnet (Lakeshore, Model EM4-CV) for increasing the magnetizing area, and that all domains of a bulk multi-seeded HTS can be magnetized in one time. Firstly, the appropriate size and thickness of the iron sheets was simulated and optimized by Comsol Multiphysics. It has been found that the magnetic field between two poles was highest when the thickness of iron was 2 mm and the length was 68 mm. Then, the simulating and optimization results had been verified by the following experiments. According to the comparison experiments, it is proved that to choose the magnetization method that only magnetizing the middle domain with the improved setup is helpful to obtain larger and more homogeneous magnetic flux for the bulk multi-seeded HTS magnet due to the added iron sheets.

Small, modular and economically attractive fusion enabled by high temperature superconductors

2019 ◽  
Vol 377 (2141) ◽  
pp. 20180354 ◽  
Author(s):  
Dennis Whyte
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Fields ◽  
Current Density ◽  
High Temperature Superconductors ◽  
Fusion Energy ◽  
High Magnetic Fields ◽  
Operating Temperatures ◽  
The Magnetic Field ◽  
Game Changer

The advantages of high magnetic fields in tokamaks are reviewed, and why they are important in leading to more compact tokamaks. A brief explanation is given of what limits the magnetic field in a tokamak, and why high temperature superconductors (HTSs) are a game changer, not just because of their higher magnetic fields but also for reasons of higher current density and higher operating temperatures. An accelerated pathway to fusion energy is described, defined by the SPARC and ARC tokamak designs. This article is part of a discussion meeting issue ‘Fusion energy using tokamaks: can development be accelerated?’.

Specific features of penetration and trapping of a magnetic flux in film and bulk YBCO high-temperature superconductors

2018 ◽  
Vol 32 (31) ◽  
pp. 1850346
Author(s):  
Kh. R. Rostami
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Flux ◽  
External Field ◽  
High Temperature Superconductors ◽  
Interaction Mechanism ◽  
Differential Method ◽  
Bulk Ybco ◽  
The Magnetic Field ◽  
Insight Into

An oscillatory differential method of local diagnostics of superconductors is applied to the analysis of the trapped magnetic flux and the effective demagnetization factor in YBCO samples. Regular steps over certain intervals of the external field are observed on the magnetic-field dependence of these parameters. It is demonstrated that, as the external field increases, crystallites in a sample are decomposed into sub- and nanocrystallites with a size much less than the penetration depth [Formula: see text] of the magnetic field. The first critical thermodynamic magnetic fields of sub- and nanocrystallites are determined. These results allow one to reveal the interaction mechanism between magnetic and crystalline microstructures of superconductors and provide a deeper insight into the physical processes that occur in high-temperature superconductors (HTSCs) in a magnetic field.

Levitation force of multi-block YBaCuO bulk high temperature superconductors

2001 ◽  
Vol 11 (1) ◽  
pp. 1808-1811 ◽  
Author(s):  
S.Y. Wang ◽  
J.S. Wang ◽  
Z.Y. Ren ◽  
H. Jiang ◽  
M. Zhu ◽  
...  
Keyword(s):  
High Temperature ◽  
Levitation Force ◽  
High Temperature Superconductors ◽  
Ybacuo Bulk

scholarly journals DEVELOPMENT AND TESTING PROTOTYPE OF HTS MODULE FOR THE SYSTEM OF MAGNETIC LEVITATION OF VEHICLE

2015 ◽  
Vol 1 (1) ◽  
pp. 37-48
Author(s):  
Anna Andreevna Demina ◽  
A V Safonov ◽  
O A Kovalchuk ◽  
E R Zapretilina ◽  
I Yu Rodin ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Nitrogen ◽  
Permanent Magnets ◽  
Magnetic Levitation ◽  
High Temperature Superconductors ◽  
Liquid Nitrogen Temperature ◽  
Magnetic Systems ◽  
Working Model ◽  
The Magnetic Field ◽  
Prospects Of Application

In recent years increasingly discusses the prospects of application of high-temperature superconductors (HTS) as the winding current-carrying elements of magnetic systems for various purposes. It seems particularly attractive possibility of such systems at liquid nitrogen temperature. The article describes the prototype of module of the magnetic system which is made on the basis of high-temperature superconducting tapes, designed for the installation and testing on a working model of a static levitation. In the working model levitation of the platform carried by the interaction of the magnetic field of the assembly of permanent magnets mounted on the platform with a field similar to assemblies located in the track structure. Compact HTS module replaces the two assemblies of permanent magnets mounted on the platform. Each block of the module represents HTS racetrack coil with current inputs, power structure, positioning system and bracing which is placed in a cryostat, providing at minimum wall thickness of the required mechanical strength and thermal insulation at liquid nitrogen temperature. The prototype of unified superconducting module successfully passed preliminary tests.

Temperature Dependence of Total AC Loss in High-Temperature Superconducting Tapes

2009 ◽  
Vol 19 (4) ◽  
pp. 3637-3644 ◽  
Author(s):  
Doan N. Nguyen ◽  
Pamidi V. P. S. S. Sastry ◽  
David C. Knoll ◽  
Justin Schwartz
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Temperature Dependence ◽  
High Temperature Superconductors ◽  
Ac Loss ◽  
Ac Losses ◽  
Transport Losses ◽  
Set Up ◽  
Interesting Behavior ◽  
The Magnetic Field

A versatile experimental facility was designed and set up to measure transport ac losses, magnetization ac losses, and total ac losses in high-temperature superconductors at variable temperatures. Several sets of measurements were carried out in the temperature range of 35 K to 100 K. Sample temperature during the measurements could be controlled within plusmn0.5 K of set temperature. Temperature dependence of transport losses reflects variation of critical current density of the tapes with temperature. Temperature dependence of magnetization losses exhibits an interesting behavior with a peak, whose position shifts to lower temperatures as the magnetic field is increased. Experimental data of ac losses at various temperatures are compared with those calculated using numerical methods. Generally, the simulated results reproduce well the experimental data.

Transport Properties over Critical Currents for Ag-Sheathed Bi2Sr2CaCu2O8 Superconductors with Different E-J Dependence

2006 ◽  
Vol 47 ◽  
pp. 118-123 ◽  
Author(s):  
K. Watanabe ◽  
T. Inoue ◽  
Satoshi Awaji ◽  
Gen Nishijima ◽  
Ken Ichiro Takahashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
High Temperature ◽  
Electric Field ◽  
Current Density ◽  
High Temperature Superconductors ◽  
Grain Morphology ◽  
Critical Currents ◽  
Heat Treated ◽  
The Magnetic Field

The current-carrying properties beyond a critical current determined by a voltage criterion for Ag-sheathed Bi2Sr2CaCu2O8 (Ag/Bi2212) superconductors are examined at 10 K and 20 K in magnetic fields. We prepared the in-field heat-treated Ag/Bi2212 wires, in order to obtain the magnetic field alignment microstructure for Ag/Bi2212. The electric field and current density (E-J) properties were evaluated for Ag/Bi2212 wires with and without the in-field heat-treatment. We found that the E-J properties for the in-field heat-treated Ag/Bi2212 wires differ from those for the out-of-field heat-treated ones, and are analogous to the E-J dependence for Bi-system high temperature superconductors with the sintered-like grain morphology.

scholarly journals Pseudogap Isotope Effect as a Probe of Bipolaron Mechanism in High Temperature Superconductors

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4973
Author(s):  
Victor D. Lakhno
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Isotope Effect ◽  
High Temperature Superconductors ◽  
Translation Invariant ◽  
Pseudogap Phase ◽  
The Magnetic Field

A theory of a pseudogap phase of high-temperature superconductors where current carriers are translation invariant bipolarons is developed. A temperature of T* a transition from a pseudogap phase to a normal one is calculated. For the temperature of a transition to the pseudogap phase, the isotope coefficient is found. It is shown that the results obtained, in particular, the possibility of negative values of the isotope coefficient, are consistent with the experiment. New experiments on the influence of the magnetic field on the isotope coefficient are proposed.

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