scholarly journals Influence of Iron Core on Critical Current and Inductance of an HTS Double Pancake Coil

2018 ◽  
Vol 228 ◽  
pp. 03002
Author(s):  
Meiying Yin ◽  
Yong Zhao ◽  
Zhuyong Li ◽  
Yanling Hu ◽  
Ping Rui ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current ◽  
Magnetic Circuit ◽  
Critical Currents ◽  
Measured Data ◽  
Iron Core ◽  
Dc Magnetic Field ◽  
Pancake Coil ◽  
Double Pancake ◽  
Good Agreement

In a high temperature superconducting (HTS) DC induction heater, an HTS coil and an iron core are essential to generate DC magnetic field and form the magnetic circuit. To understand effect of the iron core on the critical current and the inductance of the HTS coil, we prepared a double pancake coil (DPC) and an iron core in this study, and measured the critical current and inductance of the DPC. The experimental results were compared with the numerically calculated ones as well. The measured critical currents of the DPC without and with the iron core are 89 A and 84 A, respectively. Thus, the iron core does affect the critical current. Moreover, the measured inductances are 6.94 mH and 45 mH. The measured data of the critical currents and the inductances are in good agreement with the calculated results

Effect of Magnetic Fields on the Resistance and Microstructure of Al-Cu Alloy during Solidification Processing

2011 ◽  
Vol 287-290 ◽  
pp. 2916-2920
Author(s):  
Chun Yan Ban ◽  
Peng Qian ◽  
Xu Zhang ◽  
Qi Xian Ba ◽  
Jian Zhong Cui
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Turning Points ◽  
Probe Method ◽  
Solidification Processing ◽  
Ac Magnetic Field ◽  
Dc Magnetic Field ◽  
Cu Alloy ◽  
The Difference ◽  
Good Agreement

The resistance of Al-21%Cu alloy under no magnetic field, DC magnetic field and AC magnetic field from liquid to solid was measured by a four-probe method. The difference of resistance versus temperature curves (R-T curves) was analyzed. It is found that the R-T curves of Al-21%Cu alloy are monotone decreasing and have two obvious turning points. Under DC magnetic field, the liquidus and solidus temperatures of the alloy both decrease, while under AC magnetic field, the liquidus and solidus temperatures both increase. There is a good agreement between the microstructure of quenching sample and R-T curves. The mechanism of the effect of magnetic fields was discussed.

scholarly journals Experimental Study on Ferromagnetic Shunt Effects on the Critical Current of BSCCO Tape in Stacked Conductors

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
J. Sun ◽  
H. Ohara ◽  
S. Yamaguchi
Keyword(s):  
Magnetic Field ◽  
Critical Current ◽  
Layer Structure ◽  
Strong Dependence ◽  
Critical Currents ◽  
Ferromagnetic Materials ◽  
Field Analysis ◽  
Test Facility ◽  
Feeding Mode ◽  
Magnetic Field Analysis

In the 200 m high temperature superconducting (HTS) cable test facility at Chubu University constructed in 2010, a three-layer structure of the tapes in the cable is employed for obtaining the high current capacity up to 2 kA. Previous study shows that the critical current is affected by the layout of the tapes such as gaps and the current feeding mode. In the stacked tape conductors, the critical current of BSCCO tapes shows strong dependence on the current feeding directions between the tapes. The critical current is improved when the opposite-direction current is applied to them and degraded for the same-direction current feeding mode because of strong magnetic field interaction between them from the transport current in each tape. This paper presents the measurements of the critical currents of a BSCCO tape in the stacked conductors with the ferromagnetic materials. By using the ferromagnetic materials surrounding the tapes, self-field of HTS tapes is affected and their critical currents are improved by more than 10%. Ferromagnetic shunt effects on the critical current of HTS tape are reported through the magnetic field analysis.

A Novel Method to Eliminate the Screening Current–Induced Magnetic Field in a Non-insulated REBCO Double Pancake Coil

2020 ◽  
Vol 33 (6) ◽  
pp. 1729-1735
Author(s):  
Lei Wang ◽  
Qiuliang Wang ◽  
Lang Qin ◽  
Kangshuai Wang ◽  
Jianhua Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Induced Magnetic Field ◽  
Pancake Coil ◽  
Novel Method ◽  
Double Pancake

SUPERCONDUCTING FILM WITH AN ARRAY OF MAGNETIC NANOSTRIPES

2013 ◽  
Vol 27 (15) ◽  
pp. 1362020 ◽  
Author(s):  
K. KIM ◽  
K. K. D. RATHNAYAKA ◽  
I. F. LYUKSYUTOV ◽  
D. G. NAUGLE
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Critical Current ◽  
Film Surface ◽  
Critical Currents ◽  
Superconducting Film ◽  
Insulating Layer ◽  
Field Effects ◽  
Matching Field ◽  
The Magnetic Field

We present studies of the transport properties of a Sn superconducting film with an array of parallel nickel magnetic nanostripes (800 nm period) deposited on top of a germanium insulating layer covering the Sn film surface. The critical current parallel to the stripes is larger than the critical current perpendicular to the stripes. Both critical currents demonstrate strong hysteresis and matching field effects. We have observed strong hysteresis in the resistance dependence on the magnetic field.

scholarly journals Experimental Verification of the Magnetic Field Topography inside a small Hall Thruster

2021 ◽  
Vol 21 (5) ◽  
pp. 150-157
Author(s):  
Maciej Jakubczak ◽  
Jacek Kurzyna ◽  
Arsenii Riazantsev
Keyword(s):  
Magnetic Field ◽  
Magnetic Circuit ◽  
Hall Thruster ◽  
Detailed Knowledge ◽  
Hall Thrusters ◽  
Robust Method ◽  
Actual Distribution ◽  
Hall Sensors ◽  
The Magnetic Field ◽  
Good Agreement

Abstract The magnetic circuit of a 500 W class Hall thruster, an electric propulsive device for spacecraft, was characterized experimentally and the results compared with simulation in order to verify the design. The commercial 3D gaussmeter, which was used in this work, was additionally recalibrated to compensate for translation and rotation of individual Hall sensors inside the probe. The Stokes stream function approach was applied to reconstruct the magnetic field topography in the thruster. The procedure, carried out on four different cases, yielded very good agreement between simulations and measurements, even for cusped configurations. Presented technique could be used as a robust method of verification of new magnetic circuit designs not only for Hall thrusters but also for a wide class of plasma devices for which detailed knowledge about actual distribution of magnetic field is crucial for optimization.

scholarly journals Strain in YBCO Double-Pancake Coil With Stainless Steel Overband Under External Magnetic Field

2015 ◽  
Vol 25 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Youngjae Kim ◽  
Seungyong Hahn ◽  
John Voccio ◽  
Jungbin Song ◽  
Juan Bascunan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Stainless Steel ◽  
External Magnetic Field ◽  
Pancake Coil ◽  
Double Pancake

Abrikosov Monopole Vortices and Their Images in a Circular Josephson Tunnel Junction

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1265-1270 ◽  
Author(s):  
M. P. Lisitskii ◽  
R. Cristiano ◽  
C. Nappi ◽  
E. Esposito ◽  
L. Frunzio ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Critical Current ◽  
Tunnel Junction ◽  
Perpendicular Magnetic Field ◽  
Simulation Data ◽  
Parallel Magnetic Field ◽  
Josephson Tunnel ◽  
The Magnetic Field ◽  
Good Agreement

We present the results of a numerical simulation of the dependence of the Josephson critical current on the parallel magnetic field in the presence of a large number of Abrikosov 'monopole' vortices for the case of a circular junction. The influence of the junction edge on the distribution of the magnetic field of each vortex was taken into account by introducing image monopole vortices. Our simulations show that the dependence of the Josephson critical current on the parallel magnetic field (the Ic vs Hpar dependence) critically depends on the existence of a vortex located near the center of the junction. The simulation data are compared with experiments made on circular Nb/Al-AlOx/Nb junctions. A good agreement has been found between calculated and Ic vs Hpar dependences measured after the application of a perpendicular magnetic field.

Axial compressive stress dependence of critical current of REBCO double-pancake coil

2021 ◽  
pp. 1-1
Author(s):  
Yoh Nagasaki ◽  
Satoshi Sasaki ◽  
Masaki Maruyama ◽  
Daisuke Miyagi ◽  
Makoto Tsuda ◽  
...  
Keyword(s):  
Critical Current ◽  
Compressive Stress ◽  
Stress Dependence ◽  
Pancake Coil ◽  
Axial Compressive Stress ◽  
Double Pancake
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