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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 :
Volume & Issues
Volume 11, Issue 4 - Nov 2009
Volume 11, Issue 3 - Sep 2009
Volume 11, Issue 2 - May 2009
Volume 11, Issue 1 - Mar 2009
Selecting the target year
thin films on
(100) substrates prepared by the PLD process
Wee, Sung-Hun ; Moon, Seung-Hyun ; Yoo, Sang-Im ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 1~6
We report a successful fabrication of
(NdBCO) films on
(STO) (100) substrates by pulsed laser deposition (PLD) in a relatively wide processing window. Under various oxygen pressures controlled by either 1%
/Ar mixture gas or pure
gas, strongly c-axis oriented NdBCO films were grown at the substrate temperature
in 800 mTorr with 1%
/Ar gas and also in 400 and 800 mTorr with pure
gas. These samples exhibited
values over 90K and
at 77K in self-field (77K, sf). On the other hand,
were obtained at the temperature regions of
in 800 mTorr with 1%
/Ar gas at those of
in 800 mTorr with pure
gas. Unlike previous reports, resent results support that the PLD processing window for high-Jc NdBCO films is not narrow.
purity on the superconducting properties of top seeded melt growth processed
Choi, J.S. ; Park, S.D. ; Jun, B.H. ; Han, Y.H. ; Sung, T.H. ; Choo, K.N. ; Kim, C.J. ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 7~10
purity on the superconducting properties of top seeded melt growth (TSMG) processed
(Y1+x, x=0.1 and 0.2) superconductors were investigated.
(Y123) powder prepared using
with 99.75% purity and commercially available Y123 powder of 99.9% were used for the fabrication of single Y123 grain superconductors.
values of the Y1+x samples prepared using low purity Y123 powder were slightly lower than those of the samples prepared using a high purity powder. In addition to the lower
, an anomalous peak effect in the intermediate magnetic fields was observed in Y1+x samples prepared using the low purity
powder. The slight decrease in
and the anomalous peak effect are ascribed to the possible incorporation of a Y123 phase with impurity elements such as strontium and calcium included in the
powder of 99.7%. The result suggests that the low purity
powder of a low price can be used as a raw power for the fabrication of single grain YBCO bulk superconductors.
The comparison of critical currents measured by hall probe and transport methods for HTS coated conductor
Lee, Nam-Jin ; Oh, Sang-Soo ; Kim, Ho-Sup ; Ha, Dong-Woo ; Ha, Hong-Soo ; Ko, Rock-Kil ; Kim, Tae-Hyung ; Kim, Hae-Jong ; Song, Kyu-Jeong ; Moon, Seung-Hyun ; Youm, Do-Jun ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 11~14
We estimated the critical current distribution of the long length CCs using hall probe method, and checked the reliability by comparing with the four-probe dc transport method. The deviation ratio of
(a measured critical current by four probe dc transport method) and
(calculated critical current by formula (3).) was nearly smaller than 12%. The Hall probe method appeared powerful to evaluate the critical current of CCs in a reel to reel system.
Influence of multiple holes on the magnetic properties of YBCO superconductor
Oh, W.S. ; Oh, S.K. ; Jang, G.E. ; Kim, C.J. ; Han, Y.H. ; Jung, S.Y. ; Sung, T.H. ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 15~19
(YBCO) superconductor was manufactured with the top-seeded melt grown method. The 9, 16, and 25 holes, as small as 0.7mm in diameter, parallel to the c-axis were mechanically drilled. Magnetic flux mapping and levitation force were measured and compared to estimate the influence of multiple holes on the magnetic properties of YBCO superconductor at 77K. According to the measurements, the maximum magnetic flux density obtained from the plain sample was 2.48kG, while the maximum magnetic flux density of the sample with 25 holes was low as around 2.29kG. The levitation force measured on the sample with 9 holes increased from 91N to 105N. The levitation force measured on the samples with 9 holes is relatively higher than the plain sample without any holes. In this case, increase of the levitation force in the perforated samples could be explained by enhancement of the cooling efficiency more effectively. We investigated that the magnetic properties of YBCO superconductor were strongly influenced by the artificial holes.
Operating analysis of linear type magnetic flux pump
Chung, Y.D. ; Yang, S.E. ; Ko, T.K. ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 20~24
In order to explain the operating characteristics of LTMFP in a wide range of driving frequency, an analytical equation that takes into account the detailed behavior of the normal spot is necessary. In this paper, based on the phenomenon of magnetic diffusion of the superconductor we modified the theoretical equations for pumping action in LTMFP. The modified equations explained well the pumping actions under the different load magnets. These results are important to explain the pumping tendency of the LTMFP according to driving frequency.
Electrical Insulation Design of a 154kV-Class HTS Power Cable
Choi, Jin-Wook ; Kwag, Dong-Soon ; Choi, Jae-Hyeong ; Kim, Hae-Jong ; Cho, Jeon-Wook ; Kim, Sang-Hyun ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 25~28
A 154kV class high-temperature superconducting (HTS) power cable system is developing in Korea. For insulation design of this cable, it is important that study on cryogenic electrical insulation design to develop the cold dielectric type HTS cable because the cable is operated under the high voltage environment in cryogenic temperature. Therefore, this paper describes a design method for the electrical insulation layer of the cold dielectric type HTS cable adopting the partial discharge-free design under ac stress, based on the experimental results such a ac breakdown strength, partial discharge inception stress,
-n characteristics, and impulse breakdown strength of liquid nitrogen/laminated polypropylene paper (LPP) composite insulation system in which the mini-model cable is immersed into pressurized liquid nitrogen.
A Study on the Electrical and Mechanical Properties of Conduction Cooling HTS SMES
Choi, Jae-Hyeong ; Choi, Jin-Wook ; Shin, H.S. ; Kim, H.J. ; Seong, K.C. ; Kim, S.H. ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 29~32
The conduction cooling HTS SMES magnet is operated in cryogenic temperature. The insulation design at cryogenic temperature is an important element that should be established to accomplish miniaturization that is a big advantage of HTS SMES. However, the behaviors of insulators for cryogenic conditions in air or vacuum are virtually unknown. Therefore, we need active research and development of insulation concerning application of the conduction cooling HTS SMES. Specially, this paper was studied about high vacuum and cryogenic temperature breakdown and flashover discharge characteristics between cryocooler and magnet-coil. The breakdown and surface flashover discharge characteristics were experimented at cryogenic temperature and vacuum. Also, we were experimented about mechanical properties of 4-point bending test. From the results, we confirmed that about research between cryocooler and magnet-coil established basic data in the insulation design.
Test Result Analysis of a 1MW HTS Motor for Industry Application
Baik, S.K. ; Kwon, Y.K. ; Kim, H.M. ; Lee, E.Y. ; Kim, Y.C. ; Park, H.J. ; Kwon, W.S. ; Park, G.S. ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 33~36
A 1 MW class HTS (High-Temperature Superconducting) synchronous motor has been developed. This motor is aimed to be utilized for industrial application such as large motors operating in large plants. The HTS field coil of the developed motor is cooled by way of neon thermo siphonmechanism and the stator (armature) coil is cooled by water through hollow copper conductor. This paper also describes evaluation of some electrical parameters from performance test results of our motor, which was conducted at steady state in generator mode and motor mode. Open and short circuit tests were conducted in generator mode while a 1.1 MW rated induction machine was rotating the HTS machine. Electrical parameters such as mutual inductance and synchronous inductance are deduced from these tests. Load test was done upto rating torque during motor mode and efficiency was measured at each load torque.
Transparent cryogenic thermosiphon using
mixture as the working fluid
Lee, Ji-Sung ; Jeong, Sang-Kwon ; Ko, Jun-Seok ; Kim, Young-Kwon ; Jung, Se-Yong ; Han, Young-Hee ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 37~40
A mixed working fluid has a potential to widen the operation temperature range of the thermosiphon. In this study, the thermosiphon using
mixture as the working fluid is fabricated and tested to verify its transient thermo hydraulic characteristic. A transparent pyrex glass tube was used for the thermosiphon itself and the vacuum chamber was also fabricated by glass to visualize the internal state of thermo siphon. Onset of condensation temperature was related to the partial pressure of
. Two solidifications were observed and condensate temperature range of mixed working fluid was from 160K to 70.7K with
Cooling Performance Test of the KEPCO HTS Power Cable
Yang, H.S. ; Kim, D.L. ; Sohn, S.H. ; Lim, J.H. ; Choi, H.O. ; Choi, Y.S. ; Ryoo, H.S. ; Hwang, S.D. ;
Progress in Superconductivity and Cryogenics, volume 11, issue 2, 2009, Pages 41~43
The HTS power cable system of 3-phase 100-m class has been tested at the KEPCO's Gochang power testing center in Korea during 8,000 hours or more for investigating long-term operating performance. The system is rated 22.9kV, 1250A and is cooled with sub cooled liquid nitrogen. Several cooling performance tests such as cooling capacity, heat load, AC loss, temperature stability and thermal cycle were performed at operating temperature of 66.4K and several different temperatures.