FEM-simulation of superconducting linear acceleration system for pellet injection

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1469-1475
Author(s):  
Teruou Takayama ◽  
Takazumi Yamaguchi ◽  
Ayumu Saitoh ◽  
Atsushi Kamitani
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Applied Magnetic Field ◽  
Integration Method ◽  
Fem Simulation ◽  
Linear Acceleration ◽  
Regularization Technique ◽  
Acceleration Time ◽  
Pellet Injection ◽  
Improper Integrals

In order to simulate the high-temperature superconducting (HTS) linear acceleration (SLA) system for the pellet injection, the integration method of the applied magnetic field generated from the acceleration coil has been proposed. To this end, the regularization technique is used in the evaluation of the improper integrals, and simultaneously, a FEM code is developed for analyzing the shielding current density in an HTS film. In addition, the SLA system has been simulated using the code. The results of the computations show that the accuracy of the applied magnetic field is considerably improved. In this sense, the regularization technique is a useful tool. Also by locating the outer coil, the acceleration time during which the pellet speed reaches 5 km/s is about 3.5 times shorter than that of the only use of the inner coil. These results mean that the outer coil is effective in the improvement of the acceleration performance for the SLA system.

MAGNETIC HYSTERESIS OF HIGH-TEMPERATURE YBa2Cu3Ox-AgO SUPERCONDUCTORS: EXPLANATION OF MAGNETIC SUSPENSION

1988 ◽  
Vol 02 (07) ◽  
pp. 869-874 ◽  
Author(s):  
C.Y. HUANG ◽  
Y. SHAPIRA ◽  
E.J. MCNIFF ◽  
P.N. PETERS ◽  
B.B. SCHWARTZ ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Simple Model ◽  
Hysteresis Loop ◽  
Applied Magnetic Field ◽  
Magnetic Hysteresis ◽  
Magnetic Suspension ◽  
Pinning Centers ◽  
Strong Pinning

We have measured the magnetization M of superconducting YBa 2 Cu 3 O x- AgO composites with T c approximately equal to 92K as a function of an applied magnetic field H at 77 and 87K. A very pronounced M-H hysteresis loop occurs even at 87K, indicating the presence of extremely strong pinning centers. The results of these measurements, together with a simple model, explain quantitatively why these superconductors could be suspended below a magnet.

scholarly journals Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor

Nature ◽  
2002 ◽  
Vol 415 (6869) ◽  
pp. 299-302 ◽  
Author(s):  
B. Lake ◽  
H. M. Rønnow ◽  
N. B. Christensen ◽  
G. Aeppli ◽  
K. Lefmann ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Applied Magnetic Field ◽  
High Temperature Superconductor ◽  
Antiferromagnetic Order

scholarly journals High-Temperature Anyon Superconductivity

1997 ◽  
Vol 11 (01) ◽  
pp. 1-8 ◽  
Author(s):  
E. J. Ferrer ◽  
R. Hurka ◽  
V. De La Incera
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Boundary Conditions ◽  
Applied Magnetic Field ◽  
Short Range ◽  
Superconducting Materials ◽  
Finite Density ◽  
High Temperature Superconducting

The screening of an applied magnetic field in a charged anyon fluid at finite density (μ≠0) and temperature (T≠0) is investigated. Using the semi-infinite sample boundary conditions we find, at densities typical of high-temperature superconducting materials, that the anyon fluid exhibits a superconducting behavior. The total Meissner screening is characterized by two penetration lengths, corresponding to two short-range eigenmodes of propagation within the anyon fluid.

scholarly journals Increase in Critical Current Density for Increasing Applied Magnetic Field in a High-Temperature Superconducting Superlattice

2018 ◽  
Author(s):  
Shinichi Ishiguri ◽  
Shotaro Tawara
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Applied Magnetic Field ◽  
Stationary Wave ◽  
Superconducting Layer ◽  
High Temperature Superconducting ◽  
Insulator Layers

In the present work, a superlattice structure comprising superconducting and insulator layers is studied. Here, if a magnetic field is applied parallel to the layers, the lack of a pinning center leads to a novel transition; in particular, as the applied magnetic field is reduced, the stationary wave surrounding the magnetic flux quantum in the superconducting layer eventually collides with the superconducting–insulating interfaces on both sides because its radius becomes larger than the width of the superconducting layer. At this instant, the stationary wave will collapse, and a transition will occur: the magnetic quanta are collapsed and thus the uniform magnetic field distribution is achieved, which corresponds to the transition from the superconducting state to the normal state over critical current. Considering a one-dimensional model of the structure, a critical current density equation is derived that indicates an increase in the critical current density for increased applied magnetic field. Subsequently, the same calculation was conducted after changing the direction of the magnetic field component, and the combination of these two calculations expresses the anisotropic property of the structure. The phenomenon is also predicted for anisotropic critical current density. This phenomenon is an important discovery that helps manufacture high-temperature superconducting tape as well as large high-temperature superconducting coils.

scholarly journals FEM Simulation of Axisymmetric Pellet Injection System Using HTS Linear Acceleration

2019 ◽  
Vol 14 (0) ◽  
pp. 3401077-3401077 ◽  
Author(s):  
Teruou TAKAYAMA ◽  
Takazumi YAMAGUCHI ◽  
Ayumu SAITOH ◽  
Atsushi KAMITANI ◽  
Hiroaki NAKAMURA
Keyword(s):  
Fem Simulation ◽  
Linear Acceleration ◽  
Injection System ◽  
Pellet Injection

Influence of the physical parameters on the limits of magnetic stiffness of high-Tc superconducting levitation systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 221-227
Author(s):  
Xianfeng Zhao ◽  
Zhiqi Zhou ◽  
Yuan Liu ◽  
Luquan Yang
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Applied Magnetic Field ◽  
Physical Parameters ◽  
High Temperature Superconducting ◽  
Magnetic Stiffness ◽  
Superconducting Levitation

Magnetic stiffness is one of the important stability parameters of high temperature superconducting levitation systems. Till to now, great efforts have been made to understand levitation properties including flux penetration, magnetization curves, levitation force, ac susceptibilities, etc. In this paper we present a quadratic approximation method for the limit of magnetic stiffness in a high temperature superconducting levitation system based on Kim’s critical state model and Ampère law. The system is composed with a cylindrical permanent magnet (PM) and a coaxial high temperature superconductor (HTS). It is found that the limit of magnetic stiffness depends upon both the penetration history of shielding currents distribution in HTS and applied magnetic field gradients. Furthermore, the influence of the physical parameters, such as critical current density in HTS and applied magnetic field, on the limits of magnetic stiffness is investigated in detail. The obtained results display that magnetic stiffness decreases with the increasing of critical current density, since shielding currents have not penetrated into the large portion of the HTS. With the increase of applied magnetic field, the magnetic stiffness obtain a larger magnification factor. It is related to the increase of the shielding current penetration volume and the internal magnetic field in HTS.

scholarly journals Inhomogeneous Magnetic Response in Anyon Fluid at High Temperature

1998 ◽  
Vol 12 (23) ◽  
pp. 955-963
Author(s):  
E. J. Ferrer ◽  
V. de La Incera
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Applied Magnetic Field ◽  
Energy Gap ◽  
Spatial Arrangement ◽  
Homogeneous Magnetic Field ◽  
Magnetic Response ◽  
Spatial Periodicity

The charged anyon fluid in the presence of an externally applied constant and homogeneous magnetic field is investigated at temperatures larger than the energy gap (T ≫ ω c ). It is shown that the applied magnetic field inhomogeneously penetrates the sample with a spatial periodicity depending on a wavelength that decreases with temperature. The distribution of charges in the (T ≫ ω c )-phase acquires a periodic spatial arrangement.

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