Experimental Manufacture and Performance Evaluation of Linear Switched Reluctance Motor with HTS Excitation Windings
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Tadashi Hirayama, Satoshi Oto, Atsushi Higashijima, Shuma Kawabata This paper presents an experimental manufacture and performance evaluation of prototype linear switched reluctance motor with HTS excitation windings (HTS-LSRM). The Ag-alloy sheathed Bi-2223 tapes are used for HTS coils. We first present a structure of the prototype HTS-LSRM. Next, current-carrying properties of the HTS coils are measured. Furthermore, current and voltage waveforms are measured and we evaluation a control performance of the current and voltage. (Source: Physics Procedia)
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
One-dimensional Stress Evaluation of a Ring Bulk HTS with Shrinkage Fit by an Iron Ring
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): M. Tsuchimoto, M. Morita The stress distributions of a ring bulk high-Tc superconductor are studied in the one-dimensional numerical analysis. Boundary condition is derivated under shrinkage fit by an iron ring. Convergences of the solutions are compared with the simple iteration method and the successive approximation method. Maximum hoop stresses are evaluated during the field-cooled magnetization. Differences of the solutions are also discussed between the present and the previous boundary conditions. (Source: Physics Procedia)
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Study on the Magnetic Field Homogeneity of Stacked HTS Bulk Magnets Including the Deteriorated HTS Bulk by Crack for Compact NMR Relaxometry
We examined the effects of the stacking position of HTS bulk with the crack and the allowable range of degradation of HTS bulk to achieve the target field homogeneity of 150ppm/ cm3. (Source: Physics Procedia)
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Development of HTS Magnet for Rotating Gantry
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Kenji Tasaki, Kei Koyanagi, S. Shigeki Takayama, Yusuke Ishii, Tsutomu Kurusu, Naoyuki Amemiya, Toru Ogitsu, Yoshiyuki iwata, Koji Noda The effectiveness of heavy-ion radiotherapy for cancer treatment has been recognized by medical experts and the public. However, due to the large size of the equipment, this therapy has not been widely adopted. In particular, the rotating gantries used to irradiate patients with the heavy-ion beams from any direction may be as heavy as 600 tons in our estimation. By employing high-temperature superco...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Critical Current Test of Liquid Hydrogen Cooled HTC Superconductors under External Magnetic Field
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Yasuyuki Shirai, Masahiro Shiotsu, Hideki Tatsumoto, Hiroaki Kobayashi, Yoshihiro Naruo, Satoshi Nonaka, Yoshifumi Inatani High-Tc (HTC) superconductors including MgB2 will show excellent properties under temperature of Liquid Hydrogen (LH2:20K), which has large latent heat and low viscosity coefficient. In order to design and fabricate the LH2 cooled superconducting energy devices, we must clear the cooling property of LH2 for superconductors, the cooling system and safety design of LH2 cooled superconducting devices and electro-magneti...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
A Case Study of MgB2 and HTS Magnets Being Cooled and Cooled Down using a Hydrogen Thermal-siphon Cooling-loop with Coolers
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Michael A. Green When one fabricates a magnet using MgB2 or HTS conductors, the operating temperature of the magnet can be increased into the temperature range from about 15 to 30K. This temperature range is between the triple-point (13.8K) and the critical point of para-hydrogen (32.3K). Hydrogen has excellent heat transfer properties both as a liquid and as a gas at low temperature. The heat of vaporization of hydrogen is larger than any cryogenic fluid. In addition, the specific heat of the liquid and the gas is higher than any cryogenic fluid. H...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Design and Performance Analysis of an Iron Core-based No-Insulation HTS Magnet for HTS DC Induction Heating Machine
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Jongho Choi, Kwangmin Kim, Sung-Kyu Kim, Seokho Kim, Kideok Sim, Minwon Park, In-Keun Yu An energy efficiency of a high temperature superconducting (HTS) DC induction heating machine is improved up to 80∼90%. The core technology in the machine is to ensure its thermal stability during operation. In this paper, we presented design details and performance analysis results of no insulation HTS magnet with an iron core for an HTS DC induction heating machine. The HTS magnet was simulated by a finite element method and an equivalent circuit...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
R&D Progress of HTS Magnet Project for Ultrahigh-field MRI
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama An R&D project on high-temperature superconducting (HTS) magnets using rare-earth Ba2Cu3O7 (REBCO) wires was started in 2013. The project objective is to investigate the feasibility of adapting REBCO magnets to ultrahigh field (UHF) magnetic resonance imaging (MRI) systems. REBCO wires are promising components for UH...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Experimental Demonstration and Performance Estimation of a new Relaxation Oscillator Using a Superconducting Schmitt Trigger Inverter
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Takeshi Onomi An experimental demonstration and performance estimation of a superconducting relaxation oscillator using the Schmitt trigger inverter are reported. The superconducting Schmitt trigger inverter is composed of a threshold gate that uses coupled superconducting quantum interference devices. The oscillator is based on the general concept of using the Schmitt trigger inverter and a delayed feedback loop. The oscillation frequency is characterized by the circuit parameters of the delayed feedback loop and the hysteresis structure of the Sch...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Heating Effect of Mesa-type Intrinsic Josephson Junction Stacks Using Pulse Current Measurement
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): Dai Oikawa, Shinya Iwatsuka, Toko Sugiura, Hiroya Andoh, Takehiko Tsukamoto We experimentally investigated the self-heating effect of large-scale mesa-type intrinsic Josephson junction stacks in the single-crystal Bi-2212 using pulse current measurement techniques. In addition, the effects of contact resistance between the electrodes and top of the mesa were studied. The current-voltage (I-V) characteristics obtained by using the pulse measurement technique showed significantly improved voltage suppression compared to the dc measurement. Fur...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Polarization Enhancement of Terahertz Radiation Generated by Intrinsic Josephson Junctions in a Truncated Edge Square Bi2Sr2CaCu2O8+δ Mesa
In this study, we investigated the terahertz radiation from a truncated edge square mesa structure made from a superconducting Bi2Sr2CaCu2O8+δ. Using a commercial software, the polarization characteristics were determined, and introduced, while accounting for the skin effect. The axial ratio was enhanced in the simulation by performing a parametric study on the design. (Source: Physics Procedia)
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Effect of SnO, MgO and Ag2O Mix-doping on the Formation and Superconducting Properties of Bi-2223 Ag/tapes
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): X.Y. Lu, D. Yi, H. Chen, A. Nagata The Ag/tapes with the composition Bi1.8Pb0.4Sr1.9Ca2.1Cu3.5Oy + x wt% SnO + y wt% MgO + z wt% Ag2O (x = 0, 0.2, 0.4; y = 0, 0.2; z = 0, 0.2) were prepared by sintering at 835°C for 120h after partial-melting at 845°C for 1h. The individual SnO doping, SnO and Ag2O mix-doping, and SnO and MgO mix-doping all decrease the conversion of Bi-2212 phase to Bi-2223 phase. The tape with individual 0.4 wt% SnO doping shows the lowest conversion and the lowest critical current density. However, the SnO, MgO and Ag2O m...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Characteristics of Critical Current of HTS Conductor on Round Core
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): X. Zhan, L. Ren, Z. Wang, Y. Xu The bend and transposition of high-temperature superconductors (HTS) have great influence on the characteristics of critical current. For Conductor on Round Core (CORC), twist pitch and diameter will influence the characteristics of critical current. The influence of twist pitch and diameter on the critical current characteristics of CORC was studied. In this paper, the simulation of magnetic field distribution of the conductor using FEM was accomplished, and the critical current of the conductor was calculated ...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
AC Loss Calculation of REBCO Cables by the Combination of Electric Circuit Model and 2D Finite Element Method
This study investigates the losses in a two conducting-layer REBCO cable fabricated by researchers at Furukawa Electric Co. Ltd. The losses were calculated using a combination of my electric circuit (EC) model with a two-dimensional finite element method (2D FEM). The helical pitches of the tapes in each layer, P 1 and P 2, were adjusted to equalize the current in both cable layers, although the loss calculation assumed infinite helical pitches and the same current in each layer at first. The results showed that the losses depended on the relative tape-position angle between the layers (θ/θ’), because the vertical fiel...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
Critical Current Properties in Longitudinal Magnetic Field of YBCO Superconductor with APC
Publication date: 2016 Source:Physics Procedia, Volume 81 Author(s): R. Kido, M. Kiuchi, E.S. Otabe, T. Matsushita, A.K. Jha, K. Matsumoto The critical current density (J c) properties of the Artificial Pinning Center (APC) introduced YBa2Cu3O7 (YBCO) films in the longitudinal magnetic field were measured. Y2O3 or Y2BaCuO5 (Y211) was introduced as APCs to YBCO, and YBCO films with APC were fabricated on SrTiO3 single crystal substrate. The sizes of Y2O3 and Y211 were 5—10 nm and 10—20 nm, respectively. As a result, J c enhancement in the longitudinal magnetic field was observed in Y2O3 introduced YBCO f...
Source: Physics Procedia - May 9, 2016 Category: Physics Source Type: research
