Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.4.059
Youngjun Choi, Dongmin Kim, Jeonwook Cho, K. Sim, Sung-Kyu Kim, Seokho Kim
{"title":"Increased impedance by quench at a shield layer of HTS power cable for fault current limiting function","authors":"Youngjun Choi, Dongmin Kim, Jeonwook Cho, K. Sim, Sung-Kyu Kim, Seokho Kim","doi":"10.9714/PSAC.2019.21.4.059","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.4.059","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"35 1","pages":"59-63"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.4.048
Y. G. Kim, Geonwoo Baek, Seunghak Han, Yojong Choi, Junseong Kim, Haeryong Jeon, T. Ko
{"title":"Hall voltage measurement with respect to internal layout of REBCO coated conductors in an external magnetic field","authors":"Y. G. Kim, Geonwoo Baek, Seunghak Han, Yojong Choi, Junseong Kim, Haeryong Jeon, T. Ko","doi":"10.9714/PSAC.2019.21.4.048","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.4.048","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"48-52"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.2.045
J. Bang, Seokho Kim, Jaemin Kim, Soobin An, C. Im, S. Hahn
This paper reports comparison between analytic and numerical simulation approaches for calculation of screening current and screening current induced field in a high temperature superconductor magnet. Bean slab model is adopted to calculate screening current and SCF analytically, while the finite element method numerically. A case study of screening current and SCF calculation are conducted with a magnet, a 7 T 68 mm cold-bore multi-width no-insulation GdBCO magnet built and tested by Massachusetts Institute of Technology Francis Bitter Magnet Laboratory. In this study, we assume the magnet is dunked in liquid nitrogen at 77 K. Furthermore, the simulation results are compared in terms of computation time and accuracy. Finally, discussion on the different methods together with the comparison between the calculations and experiment is provided.
本文报道了高温超导磁体中屏蔽电流和屏蔽电流感应场计算的解析方法与数值模拟方法的比较。采用Bean - slab模型对筛流和SCF进行解析计算，采用有限元法进行数值计算。以麻省理工学院Francis Bitter磁体实验室制造和测试的7 T 68 mm冷孔多宽无绝缘GdBCO磁体为例，进行了筛选电流和SCF计算的案例研究。在这项研究中，我们假设磁铁浸泡在77 K的液氮中。并从计算时间和精度两方面对仿真结果进行了比较。最后对不同的方法进行了讨论，并将计算结果与实验结果进行了比较。
{"title":"Comparison between analytic and numerical approaches to calculate screening current induced field in HTS magnet","authors":"J. Bang, Seokho Kim, Jaemin Kim, Soobin An, C. Im, S. Hahn","doi":"10.9714/PSAC.2019.21.2.045","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.2.045","url":null,"abstract":"This paper reports comparison between analytic and numerical simulation approaches for calculation of screening current and screening current induced field in a high temperature superconductor magnet. Bean slab model is adopted to calculate screening current and SCF analytically, while the finite element method numerically. A case study of screening current and SCF calculation are conducted with a magnet, a 7 T 68 mm cold-bore multi-width no-insulation GdBCO magnet built and tested by Massachusetts Institute of Technology Francis Bitter Magnet Laboratory. In this study, we assume the magnet is dunked in liquid nitrogen at 77 K. Furthermore, the simulation results are compared in terms of computation time and accuracy. Finally, discussion on the different methods together with the comparison between the calculations and experiment is provided.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"45-49"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/psac.2019.21.2.031
H. Hong, Hee-Won Kwon, Joon-Ha Kim, D. Ha, Young-Hun Kim
{"title":"Evaluation of contamination for the Andong-dam sediment and a magnetic separation for reducing the contamination level","authors":"H. Hong, Hee-Won Kwon, Joon-Ha Kim, D. Ha, Young-Hun Kim","doi":"10.9714/psac.2019.21.2.031","DOIUrl":"https://doi.org/10.9714/psac.2019.21.2.031","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"31-35"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.1.040
Jhongkwon Kim, Hyunjun Park, J. Bae, Sangkwon Jeong, D. Chang
{"title":"Investigation of amorphous material with ice for cold thermal storage","authors":"Jhongkwon Kim, Hyunjun Park, J. Bae, Sangkwon Jeong, D. Chang","doi":"10.9714/PSAC.2019.21.1.040","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.1.040","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"94 1","pages":"40-44"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.2.040
M. Kang, J. Joo, B. Jun, K. Choo, Chan-Joong Kim
{"title":"Effects of a compaction method for powder compacts on the critical current density of MgB 2 bulk superconductors","authors":"M. Kang, J. Joo, B. Jun, K. Choo, Chan-Joong Kim","doi":"10.9714/PSAC.2019.21.2.040","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.2.040","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"40-44"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.2.010
Yusuke Ito, Y. Akiyama
In order to improve resource value, separation of nonferrous metals obtained from crushed materials of home appliances is required. In this study, we aimed to develop a continuous separation system by magneto-Archimedes method using magnetic fluid as a medium and the permanent magnet as a magnetic field source. Firstly, the separation conditions were examined in which only copper is settled and the difference in levitation positions between aluminum and other metals are over 1 cm. Based on the results, levitation experiment of each metal and separation experiment from the mixture of nonferrous metals were confirmed. The separation experiment showed that the continuous separation of copper and aluminum from a mixture of nonferrous metals is possible.
{"title":"Study on separation of nonferrous metal utilizing magneto-Archimedes method","authors":"Yusuke Ito, Y. Akiyama","doi":"10.9714/PSAC.2019.21.2.010","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.2.010","url":null,"abstract":"In order to improve resource value, separation of nonferrous metals obtained from crushed materials of home appliances is required. In this study, we aimed to develop a continuous separation system by magneto-Archimedes method using magnetic fluid as a medium and the permanent magnet as a magnetic field source. Firstly, the separation conditions were examined in which only copper is settled and the difference in levitation positions between aluminum and other metals are over 1 cm. Based on the results, levitation experiment of each metal and separation experiment from the mixture of nonferrous metals were confirmed. The separation experiment showed that the continuous separation of copper and aluminum from a mixture of nonferrous metals is possible.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"10-14"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.2.015
Chisato Mukuta, Y. Akiyama
In the mine exploration sites, sustainable treatment system of mine water with energy saving and minimized chemical additives is required. Since most of the mine water contains highly-concentrated ferrous ion, it is necessary to study on the removal method of iron ions. We propose the system consisting of two processes; precipitation process by air oxidation using solid catalyst-modified magnetite and separation process combining gravitational sedimentation and magnetic separation using a permanent magnet. Firstly, in the precipitation process (a former process of the system), we succeeded to prepare solid catalyst-modified magnetite. Air oxidation using solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material showed high iron removal capability. Secondly, in the separation process (latter process of the system), solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material can be separated by a superconducting bulk magnet and a permanent magnet.
{"title":"Fundamental study on sustainable treatment system of mine water using magnetized solid catalyst","authors":"Chisato Mukuta, Y. Akiyama","doi":"10.9714/PSAC.2019.21.2.015","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.2.015","url":null,"abstract":"In the mine exploration sites, sustainable treatment system of mine water with energy saving and minimized chemical additives is required. Since most of the mine water contains highly-concentrated ferrous ion, it is necessary to study on the removal method of iron ions. We propose the system consisting of two processes; precipitation process by air oxidation using solid catalyst-modified magnetite and separation process combining gravitational sedimentation and magnetic separation using a permanent magnet. Firstly, in the precipitation process (a former process of the system), we succeeded to prepare solid catalyst-modified magnetite. Air oxidation using solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material showed high iron removal capability. Secondly, in the separation process (latter process of the system), solid catalyst-modified magnetite using Fe2(SO4)3 as a starting material can be separated by a superconducting bulk magnet and a permanent magnet.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"15-21"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.4.029
A. Molodyk, A. Markelov, A. Valikov, V. Chepikov, A. Petrzhik, B. Massalimov, P. Degtyarenko, R. Uzkih, A. Soldatenko, K. Sim, Soon Hwang
2G HTS wire with high engineering current density is desired for applications where compact, high power density superconducting equipment is important. We have succeeded in enhancing engineering current density of commercial SuperOx 2G HTS wire based on GdBCO by increasing the HTS layer thickness without fast degradation of the HTS film microstructure. This was possible after improving the temperature uniformity along the HTS film deposition zone. In particular, the wire engineering current density was increased from 700-770 A/mm (for a 65 μm-thick wire without stabilisation) or 430-480 A/mm (for a 105 μm-thick stabilised wire) at the beginning of this study to almost 1200 A/mm (for a 67 μm-thick wire without stabilisation) or 770 A/mm (for a 107 μm-thick stabilised wire) at completion of this study.
{"title":"2G HTS wire with enhanced engineering current density attained through the deposition of HTS layer with increased thickness","authors":"A. Molodyk, A. Markelov, A. Valikov, V. Chepikov, A. Petrzhik, B. Massalimov, P. Degtyarenko, R. Uzkih, A. Soldatenko, K. Sim, Soon Hwang","doi":"10.9714/PSAC.2019.21.4.029","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.4.029","url":null,"abstract":"2G HTS wire with high engineering current density is desired for applications where compact, high power density superconducting equipment is important. We have succeeded in enhancing engineering current density of commercial SuperOx 2G HTS wire based on GdBCO by increasing the HTS layer thickness without fast degradation of the HTS film microstructure. This was possible after improving the temperature uniformity along the HTS film deposition zone. In particular, the wire engineering current density was increased from 700-770 A/mm (for a 65 μm-thick wire without stabilisation) or 430-480 A/mm (for a 105 μm-thick stabilised wire) at the beginning of this study to almost 1200 A/mm (for a 67 μm-thick wire without stabilisation) or 770 A/mm (for a 107 μm-thick stabilised wire) at completion of this study.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"90 1","pages":"29-33"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.9714/PSAC.2019.21.2.022
S. Nishijima
The superconducting magnetic separation system has been developing to separate the iron oxide scale from the feed water of the thermal power plant. The accumulation in the boiler lowers the heat exchange rate or in the worst case damages it. For this reason, in order to prevent scale generation, controlling pH and redox potential is employed. However, these methods are not sufficient and then the chemical cleaning is performed regularly. A superconducting magnetic separation system is investigated for removing iron oxide scale in a feed water system. Water supply conditions of the thermal power plant are as follows, flow rate 400 t / h, flow speed 0.2 m / s, pressure 2 MPa, temperature 160 200 ° C, amount of scale generation 50 120 t / 2 years. The main iron oxide scale is magnetite (ferromagnetic substance) and its particle size is several tens μm. As the first step we are considering to introduce the system to the chemical cleaning process of the thermal power plant instead of the thermal power plant itself. The current status of development will be reported.
利用超导磁选系统分离热电厂给水中的氧化铁垢是目前研究的课题。锅炉中的积聚降低了热交换率，在最坏的情况下损坏了热交换率。因此，为了防止水垢的产生，需要控制pH和氧化还原电位。然而，这些方法是不够的，然后定期进行化学清洗。研究了一种超导磁选系统去除给水系统中的氧化铁垢。火电厂供水条件为:流量400 t / h，流速0.2 m / s，压力2 MPa，温度160 200℃，水垢产生量50 120 t / 2年。氧化铁主要为磁铁矿(铁磁性物质)，粒度为几十μm。作为第一步，我们正在考虑将该系统引入热电厂的化学清洗过程，而不是热电厂本身。将报告目前的发展状况。
{"title":"Removal of iron oxide scale from feed-water in thermal power plant using superconducting magnetic separation","authors":"S. Nishijima","doi":"10.9714/PSAC.2019.21.2.022","DOIUrl":"https://doi.org/10.9714/PSAC.2019.21.2.022","url":null,"abstract":"The superconducting magnetic separation system has been developing to separate the iron oxide scale from the feed water of the thermal power plant. The accumulation in the boiler lowers the heat exchange rate or in the worst case damages it. For this reason, in order to prevent scale generation, controlling pH and redox potential is employed. However, these methods are not sufficient and then the chemical cleaning is performed regularly. A superconducting magnetic separation system is investigated for removing iron oxide scale in a feed water system. Water supply conditions of the thermal power plant are as follows, flow rate 400 t / h, flow speed 0.2 m / s, pressure 2 MPa, temperature 160 200 ° C, amount of scale generation 50 120 t / 2 years. The main iron oxide scale is magnetite (ferromagnetic substance) and its particle size is several tens μm. As the first step we are considering to introduce the system to the chemical cleaning process of the thermal power plant instead of the thermal power plant itself. The current status of development will be reported.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"21 1","pages":"22-25"},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71376678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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