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Transport Current Distribution of a SmBCO Coated Conductor
Lee, Jae-Young,Yoo, Jae-Un,Lee, Sang-Moo,Jung, Ye-Hyun,Youm, Do-Jun,Kim, Ho-Sup,Ha, Hong-Soo,Oh, Sang-Soo The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.4
The transport current distribution across the tape width of a SmBCO coated conductor was investigated. The current distribution was estimated by applying an inversion process to the field distribution measured in the vicinity of the tape by using a scanning Hall probe method. The obtained result is well consistent with one predicted by the Bean model, however, at the edges the current are not constant and do not generally plateau, on the contrary.
Thick SmBCO/IBAD-MgO Coated Conductor for High Current Carrying Power Applications
Hong-Soo Ha,Jung-Hun Lee,Rock-Kil Ko,Ho-Sup Kim,Ho-Kyum Kim,Seung-Hyun Moon,Chan Park,Do-Jun Youm,Sang-Soo Oh IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>Long-length (Sm<SUB>1+x</SUB>B<SUB>2-x</SUB>C<SUB>3</SUB>O<SUB>7-y</SUB>) coated conductor was fabricated using ion beam assisted deposition (IBAD)-MgO template (LaMnO<SUB>3</SUB>/IBAD - MgO/Y<SUB>2</SUB>O<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Hastelloy) by the reactive co-evaporation method for electric power applications. SmBCO superconducting layers with thicknesses from 1 to 3 ¿m were deposited to investigate the effect of SmBCO thickness on the in-plane texture, surface morphology and superconducting properties. In this study, the optimal deposition conditions were examined to make thick SmBCO coated conductor without degradation of critical current density. The oxygen partial pressure and temperature were controlled in the range of 1~20 mTorr and 600 ~ 800°C, respectively. SmBCO/IBAD-MgO coated conductors showed high critical current densities over 2.0 MA/cm<SUP>2</SUP> with small amount of degradation by increasing the thickness of superconducting layer up to 3 ¿m. The critical current of 637.5 A/cm-w (J<SUB>C</SUB> = 2.12 MA/cm<SUP>2</SUP>) at 77 K in self- field was obtained in 3 ¿m-thick and 1 m long coated conductor. This is the highest critical current reported so far of the coated conductor with SmBCO superconducting layer deposited by co-evaporation.</P>
위상차를 갖고 변화하는 자기장과 전류가 동시에 가해진 $Sm_1Ba_2Cu_3O_{7-\delta}$ Coated Conductor의 자기이력 손실
이상무,정예현,곽기성,이준규,유재은,염도준,김호섭,하홍수,오상수,Lee, Sang-Moo,Jung, Ye-Hyun,Kwak, Ki-Sung,Rhee, Joon-Kyu,Yoo, Jae-Un,Youm, Do-Jun,Kim, Ho-Sup,Ha, Hong-Soo,Oh, Sang-Soo 한국초전도학회 2009 Progress in superconductivity Vol.10 No.2
The magnetic field profiles near the surface of a $Sm_1Ba_2Cu_3O_{7-\delta}$ coated conductor(CC-tape) under magnetic field and current that were applied simultaneously with phase differences ${\phi}s$ were measured using scanning Hall probe method. Measurements were carried out along the elliptic load lines with $\phi=90^{\circ}\;and\;45^{\circ}$ for some $B_{peak},\;I_{peak}$ values. From the measured field profiles, sheet current density J(x, $B_a,\;I_a$) and magnetic flux density $B_0(x,\;B_a,\;I_a)$ profiles in the CC-tape were calculated. Using these J(x, $B_a,\;I_a$) and $B_0(x,\;B_a,\;I_a)$ profiles, we estimated the hysteresis energy loss Q in the CC-tape. The estimated Qs, together with our previous results for $\phi=0^{\circ}$ from [9], were compared with theoretical values based on Brandt's calculation.
Angular dependence of critical current of SmBCO coated conductor fabricated by co-evaporation method
Ho-Sup Kim,Hong-Soo Ha,Sang-Soo Oh,Kyu-Jeong Song,Rock-Kil Ko,Dong-Woo Ha,Tae-Hyung Kim,Do-Jun Youm,Nam-Jin Lee,Seung-Hyun Moon,Sang Im Yoo,Chan Park 한국초전도저온학회 (구 한국초전도저온공학회) 2008 한국초전도저온공학회논문지 Vol.10 No.2
Scanning Hall probe를 이용한 coated conductor의 field profile 측정과 current profile 계산
유재은,이상무,정예현,이재영,정용환,염도준,김호섭,하홍수,오상수,Yoo, Jae-Un,Lee, Sang-Moo,Jung, Ye-Hyun,Lee, Jae-Young,Jung, Yong-Hwan,Youm, Do-Jun,Kim, Ho-Sup,Ha, Hong-Soo,Oh, Sang-Soo 한국초전도학회 2007 Progress in superconductivity Vol.8 No.2
We measured the field profiles, H(x)'s of coated conductors by using scanning Hall probe method when various magnetic fields, $H{_\alpha}'s$ or currents, I's were applied. From the measured field profiles, we calculated the current profiles, J(x)'s by the inversion method. The calculated J(x)'s of coated conductors show some different properties from the standard critical state model. $J{_c}'s$ are inhomogeneous varying with the positions and are not constant when $H_{\alpha}$ or I changes. And when I decreases the features of current reversion are remarkably different from the model.
Application of reflow soldering method for laminated high temperature superconductor tapes
Lee, Nam-Jin,Oh, Sang-Soo,Kim, Ho-Sup,Ha, Dong-Woo,Ha, Hong-Soo,Ko, Rock-Kil,Shin, Hyung-Seop,Youm, Do-Jun The Korean Society of Superconductivity and Cryoge 2010 한국초전도저온공학회논문지 Vol.12 No.2
A lamination system using reflow soldering was developed to enhance the mechanical properties of high temperature superconductor (HTS) tape. The laminated coated conductor tape was fabricated using the continuous lamination process. The mean, maximum, and minimum tensile loads in a T-peel test of the laminated coated conductor were 9.9 N, 12.5 N, and 7.6 N, respectively. The critical current ($I_c$) distributions of the non-laminated and laminated coated conductor were compared using anon-contact Hall probe method. The transport $I_c$ nearly matched the non-contact $I_c$; however, some degraded Ic regions were found on the length of 800 cm of laminated coated conductor. We confirmed that the cause of the partially degraded $I_c$ was due to an increase in line tension by (1) solidification induced by a change of composition that usually occurs in molten brass (Cu, Zn) in solder, or (2) non-homogeneity of the thickness of the coated conductor or metal tapes. We suggest that reflow soldering is a promising method for reinforced HTS tape if the controlling solder thickness and lamination guide are modified.
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 The Korean Society of Superconductivity and Cryoge 2009 한국초전도저온공학회논문지 Vol.11 No.2
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 $I_{c-T}$ (a measured critical current by four probe dc transport method) and $I_{c-H}$ (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.
Angular dependence of critical current of SmBCO coated conductor fabricated by co-evaporation method
Kim, Ho-Sup,Ha, Hong-Soo,Oh, Sang-Soo,Song, Kyu-Jeong,Ko, Rock-Kil,Ha, Dong-Woo,Kim, Tae-Hyung,Youm, Do-Jun,Lee, Nam-Jin,Moon, Seung-Hyun,Yoo, Sang-Im,Park, Chan The Korean Society of Superconductivity and Cryoge 2008 한국초전도저온공학회논문지 Vol.10 No.2
Angular dependence of critical current density of SmBCO coated conductor fabricated by co-evaporation method was investigated. For comparison, three samples were fabricated by a co-evaporation method and one sample was fabricated by a pulsed laser deposition process. The deposition system, named EDDC (Evaporation using Drum in Dual Chambers), is a batch type co-evaporation system, which is composed of reaction chamber and evaporation chamber. The normalized critical current density ratio ($I_c/I_c$(H//ab-plane)) of EDDC-SmBCO samples was found to be higher than that of PLD-YBCO sample in the whole range of angle. While the EDDC-SmBCO samples evidently had a peak at the angle of H//c-axis in the plot of the angular dependence of critical current, the normalized critical current of PLD-YBCO sample decreased monotonically without any peak as angle increased. The field dependence of critical current under the magnetic field parallel to the normal direction of those samples showed similar aspect in the range of $0\;G{\sim}5000\;G$.
Ho-Sup Kim,Sang-Soo Oh,Nam-Jin Lee,Seung-Kyu Baik,Dong-Woo Ha,Rock-Kil Ko,Hong-Soo Ha,Tae-Hyung Kim,Do-Jun Youm,Seung-Hyun Moon,Chan Park IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>The Hall probe measurement system was used to measure the critical current distribution of superconducting coated conductor. The system consists of reel to reel moving apparatus, 7 array Hall probe, a rotary encoder and permanent magnet. The magnetic field profile across the width of superconducting coated conductor using Bean's critical state model was calculated. The effect of various parameters of the formulas on the magnetic field distribution and the effect of shape and size of artificial defects, which were formed on the surface of SmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-d</SUB>(SmBCO) coated conductor using laser marking system, on the Hall probe magnetic field signal of the Hall probe measurement system was investigated.</P>