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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Progress in Superconductivity and Cryogenics
Journal Basic Information
Journal DOI :
The Korea Institute of Applied Superconductivity and Cryogenics
Editor in Chief :
Hyung-Seop Shin, Won-Nam Kang
Volume & Issues
Volume 8, Issue 4 - Nov 2006
Volume 8, Issue 3 - Sep 2006
Volume 8, Issue 2 - Apr 2006
Volume 8, Issue 1 - Mar 2006
Selecting the target year
A Review on AC Loss Characteristics of High
Amemiya, N. ; Jiang, Z. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 1~7
This paper reviews AC loss characteristics of high
superconductors. The mechanisms of AC loss generation are explained briefly, and AC losses are classified by the magnetic field components which generate them. A couple of analytical formulae of AC losses, which are useful for simple and rough AC loss estimations, are presented. AC loss characteristics of single BSCCO multifilamentary conductors and single YBCO coated conductors are reviewed based on previous experimental and numerical studies. AC loss characteristics of those two types of practical high
superconductors are compared with each other.
The Study of Different Buffer Structure on Ni-W Tape for SmBCO Coated Conductor
Kim, T.H. ; Kim, H.S. ; Oh, S.S. ; Ko, R.K. ; Ha, D.W. ; Song, K.J. ; Lee, N.J. ; Yang, J.S. ; Jung, Y.H. ; Youm, D.J. ; Park, K.C. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 8~11
High temperature superconducting coated conductor has various buffer structures on Ni-W alloy. We comparatively studied the growth conditions of a multi buffer layer
and a single buffer layer
on textured Ni-W alloy tapes. XRD data showed that the qualities of in-plane and out-of-plane textures of the two type buffer structures were good. Also, we investigated the properties of SmBCO superconducting layer that was deposited on the two type buffer structure. The SmBCO superconducting properties on the single and multi buffer structure showed different critical current values and surface morphologies. FWHM of In-plane and out-of-plane textures were
in the top CeO2 layer of the multi-buffer layers of
single buffer layer.
SmBCO superconducting layers were deposited on two type buffer layer.
of SmBCO deposited on single and multi buffer were 90 A/cm, 150 A/cm and corresponding
at 77K in self-field, respectively.
Long Length YBCO Coated Conductors Prepared by an MOD Process on Buffered Metallic Tapes
Chung, Kook-Chae ; Yoo, Jai-Moo ; Ko, Jae-Woong ; Kim, Young-Kuk ; Kim, Tae-Hyung ; Ko, Rock-Kil ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 12~14
YBCO coated conductors have been fabricated by the reel-to-reel processing using TFA-MOD method. In this work, the fluorine-free Y & Cu precursor solution was synthesized to shorten the calcining time by reducing the evolution of HF gas, thus the meter-long YBCO precursor films can be made within few hours by the continuous slot-die coating & calcination step using the F-free Y & Cu precursor solution. The annealing step was followed to make the YBCO films by the reel-to-reel method with the vertical gas flow system onto the moving tape. To increase the growth rate of the YBCO films by enhancing the removal of HF gas, the low total pressure was adopted in the annealing processing. And the water partial pressure and the oxygen partial pressure were varied to optimize the growth conditions of the MOD-YBCO films on the buffered metal tape. FE-SEM and XRD were used to investigate the surface morphologies and the texture of the meter-long YBCO films. The end-to-end critical current
of 63A/cm-width and the critical current density
with the thickness of
were obtained in the 0.42m long coated conductor.
Thin Films Fabricated by Pulsed Laser Deposition
Song, S.H. ; Ko, K.P. ; Song, K.J. ; Moon, S.H. ; Yoo, S.I. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 15~18
REBCO coated conductors (RE: rare earth elements) have recently drawn great attention since they are known to possess stronger flux pinning centers in high magnetic fields compared with YBCO coated conductors. In this study,
was selected to investigate the influence of the distance between target and substrate and substrate temperature on the superconducting properties of GdBCO films on the
substrate. Samples were fabricated by pulsed laser deposition (PLD) with a Nd:YAG laser (355nm). Under a given oxygen pressure of 800mTorr, we changed the distance between target and substrate from 5.5cm to 7.0cm and the substrate temperature from
. The crystallinity and texture of GdBCO films were analyzed by X-ray diffraction (XRD), and the surface morphology was observed by the scanning electron microscopy (SEM). Tc and Jc values were measured by the four point probe method. High quality GdBCO films with Tc of 89.7K and Jc over
at 77 K in self field were successfully fabricated by optimizing processing parameters. The detailed processing conditions, microstructure and superconducting properties will be presented for a discussion.
Buffer Layer Using MOD Process
Kim, Young-Kuk ; Yoo, Jai-Moo ; Chung, Kook-Chae ; Ko, Jae-Woong ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 19~21
Biaxially textured Ni was fabricated by electrodeposition process and delaminated from the biaxially textured cathode surface for further buffer layer deposition process. Those electrode posited Ni substrates showed well-developed biaxial texture and smooth surface. In order to improve the thermal stability of Ni substrates, Mn was alloyed by adding Mn precursor into the electrodeposition bath. Subsequently,
buffer layers are deposited by MOD process to prevent interfacial reaction between superconductor and substrates. In particular, Bismuth oxide was added to
to realize lower temperature processing of buffer layers. The microstructure and texture development of each layers have been investigated. Preliminary results shows that all electro/chemical process can be a candidate for cost effective route to YBCO coated conductor.
Computation of the Current Limiting Behavior of BSCCO-2212 High-Temperature Superconducting Tube with Shunt Coils
Kim, H.M. ; Park, K.B. ; Lee, B.W. ; Oh, I. ; Sim, J. ; Hyun, O.B. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 22~25
This paper deals with the computation of the current limiting behavior of high-temperature superconducting (HTS) modules for the superconducting fault current limiter (SFCL). The SFCL module consists of a monofilar type BSCCO-2212 tube and a shunt coil made of copper or brass. The shunt coil is connected to the monofilar superconducting tube in parallel. Through analysis of the quench behavior of the monofilar component with shunt coils, it is achieved to drive an equivalent circuit equation from the experimental circuit structure. In order to analyze the quench behavior of the SFCL module, we derived a partial differential equation technique. Inductance of the monofilar component and the impedance of the shunt coil are calculated by Bio-Savart and Ohm's formula, respectively. We computed the quench behavior using the calculated values, and compared the results with experimental results for the quench characteristics of a component. The results of computation and test agreed well each other, and it was concluded that the analytic result could be applied effectively to design of the distribution-level SFCL system.
Effect of Epoxy Cracking on Initial Quench Behavior about High Field Superconducting Magnet
Lee, B.S. ; Kim, D.L. ; Choi, Y.S. ; Yang, H.S. ; Yoo, J.S. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 26~29
The study to be presented related on initial behavior of quench concerned with many considerations, such as epoxy impregnated coil, critical current density related on strain and temperature, winding effect and behavior of internal superconducting wire. Especially, the deformation behavior of coils under magnetic field and thermal contractions at cryogenic temperatures to be dealt with the analytical method related on Fracture Mechanics. From the results, we know that the strain by self weight contribute to epoxy cracking at the edge of deformed coils and the deformation behavior relate on epoxy cracking must be dealt with biaxial loading problem. Then, the epoxy crack on
under biaxial loading have been propagated with inclined crack angle and joined superconducting wire. Also, we can explain transfer of epoxy crack propagation energy from epoxy resin to superconducting wire.
Design Considerations of Cryogenic Cooling System for High Field Magnets
Choi, Yeon-Suk ; Kim, Dong-Lak ; Lee, Byoung-Seob ; Yang, Hyung-Suk ; Yoo Jong-Shin ; Painter Thomas A. ; Miller John R. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 30~33
Several crucial issues are discussed in the design of cryogenic cooling system for high field magnets. This study is mainly motivated by our ongoing program to develop a 21 T Fourier Transform Ion Cyclotron Resonance Mass Spectrometer (FT-ICR MS). The magnets of this system will be built horizontally to accomplish the requirement of user friendliness and reliability, and the replenishment of cryogen will not be necessary by a closed-loop cooling concept. The initial cool-down and safety are basically considered in this paper. The effects of the helium II volume and the gap distance of the weight load relief valve (or safety valve) on the cool-down time and temperature rising during an off-normal state are discussed. The total amount of cryogenic cooling loads and the required helium flow rate during cool-down are also estimated by a relevant heat transfer analysis. The temperatures of cryogen-free radiation shield are finally determined from the refrigeration power of a cryocooler and the total cryogenic loads.
Cycle Analysis on LNG Boil-off Gas Re-Liquefaction Plant
Chin, Y.W. ;
Progress in Superconductivity and Cryogenics, volume 8, issue 4, 2006, Pages 34~38
Cycle analysis was performed in order to find the optimum design point of the LNG Boil-off gas re-liquefaction system. Thermodynamic analysis revealed the system could be defined by three state variables. Thus the system performance could be described by the three cold endpoint temperatures of the three-pass heat exchanger. This enabled us to investigate the cycle performance in terms of the heat exchanger parameters. To get access to the cycle states of higher system performances, larger heat exchangers were found necessary. Also the thermal pinch in cryogenic heat exchangers was found to act as a limiting factor to the system performance.