Teion Kogaku (journal of The Cryogenic Society of Japan)最新文献_第2页

Thermal Stability of Small Coil using Ta Barrier MgB_2 Wire Ta势垒MgB_2线小线圈的热稳定性

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2010-01-25 DOI: 10.2221/JCSJ.45.15

和英田中, Tanaka Kazuhide, Nakao Akihiro, 彰浩中尾, 浦竹勇希寛, Uratake Yukihiro, Kajikawa Kazuhiro, 一弘柁川, 和夫船木, Funaki Kazuo, Okada Michiya, 道哉岡田

{"title":"Thermal Stability of Small Coil using Ta Barrier MgB_2 Wire","authors":"和英田中, Tanaka Kazuhide, Nakao Akihiro, 彰浩中尾, 浦竹勇希寛, Uratake Yukihiro, Kajikawa Kazuhiro, 一弘柁川, 和夫船木, Funaki Kazuo, Okada Michiya, 道哉岡田","doi":"10.2221/JCSJ.45.15","DOIUrl":"https://doi.org/10.2221/JCSJ.45.15","url":null,"abstract":"Synopsis : We have fabricated a small test coil with an AlN former by employing Cu-Ni sheathed Ta barrier MgB 2 multifilamentary wire made in a wind-and-react process. An overcurrent was applied to the coil conduction-cooled in an initial temperature range between 10 K and 30 K to investigate its thermal stability by measuring the temperature distribution in the winding and the terminal voltage after application of the overcurrent. The experimental results show that the permissive temperature rise without thermal runaway decreases with the initial temperature, while total heat generation at the time of thermal runaway is at a maximum when the initial temperature is approximately 14 K. We also numerically calculated the responses of the test coil to the overcurrent by simulating the electrical and thermal processes using the finite element method and V-I characteristics of the coil. The comparisons with the experimental results show that the electrical and thermal responses are reproduced well using the numerical model.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125452674","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}

引用次数: 0

Dy-Ba-Cu-O系バルク電流リードの冷凍機による伝導冷却状態での通電特性 di - ba - cu - o类大宗电流导线的制冷机的传导冷却状态下的通电特性

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2010-01-25 DOI: 10.2221/JCSJ.45.22

英一手嶋, 充紀森田, 正文小方, 賢長嶋, 勝岩松

引用次数: 0

特集「超伝導体における磁束ピンニング」によせて特集“超导体中的磁通引针”

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.516

照男松下, 利治冨中

引用次数: 0

RE-211相粒子を添加した(Nd, Eu, Gd)Ba2Cu3Oy超電導体の高温度領域の磁束ピンニング特性添加了RE-211相粒子的(Nd, Eu, Gd)Ba2Cu3Oy超电导体的高温度区域的磁通引针特性

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.579

勝木内, Nahid Mohammed, 荘司小田部, 照男松下, Muralidhar Miryala

引用次数: 1

IBAD/CVD-YBCOテープ線材のピンニング特性の超電導層厚依存性 IBAD/CVD-YBCO胶带线材的引针特性对超导层厚度的依赖性

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.565

祐治高橋, 携造姫木, 勝木内, 照男松下, 浩二式町, 智則渡部, 直二鹿島, 重夫長屋

引用次数: 0

Temperature Changes and Magnetic Properties of Melt-textured Superconducting Bulk Magnets in the Magnetizing Processes using Quasi-static Magnetic Fields 准静态磁场磁化过程中熔融织构超导体磁体的温度变化和磁性能

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.587

T. Oka, K. Yokoyama, H. Fujishiro, K. Noto

{"title":"Temperature Changes and Magnetic Properties of Melt-textured Superconducting Bulk Magnets in the Magnetizing Processes using Quasi-static Magnetic Fields","authors":"T. Oka, K. Yokoyama, H. Fujishiro, K. Noto","doi":"10.2221/JCSJ.44.587","DOIUrl":"https://doi.org/10.2221/JCSJ.44.587","url":null,"abstract":"The temperature changes and magnetic-field trapping behaviors of melt-textured, single-domain Sm-Ba-Cu-O bulk superconductors have been precisely investigated for magnetizing processes by means of quasi-static magnetic fields such as field cooling (FC) and zero field cooling (ZFC). The experiments were conducted in the temperature range of 40-80 K by simultaneously measuring both the temperature and magnetic flux density. According to the balance of heat generation and drainage, the temperature evolution profiles show distinctive behaviors of the invading and exhausting magnetic fluxes into and out of the HTS bulk magnet. The average temperature change during the FC process reached the maximum value of 4.63 K when the sweep rate was 11.3 mT/s and the initial temperature was 45.6 K. In the ZFC process, both the temperature and magnetic flux density kept increasing gradually even after the external magnetic field stopped growing at 5 T in the ascending field process. The highest temperature rise due to the flux motion reached 4.6 K even when the sample was magnetized with at sweeping rate of 11.3 mT/s. As the behavior of temperature rise was different between the ascending and descending field processes, it is suggested that the magnetic fluxes in the processes invade and diffuse under different heating characteristics.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126973958","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}

引用次数: 0

Influences of Microstructure on Critical Current Properties in MgB_2 Superconducting Bulk Fabricated using a Premix-PICT Method 微结构对预混合- pict法制备MgB_2超导体临界电流特性的影响

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.613

Y. Shimada, T. Ohashi, S. Hata, Ikeda Ken-ichi, H. Nakashima, Toshihiko Mochizuki, Shimoyama Jun-ichi, S. Horii, K. Kishio

引用次数: 2

Fabrication and Superconducting Properties of Alternately-layered MgB_2/Ni Thin Films with Different Ni-layer Spacing 不同镍层间距MgB_2/Ni薄膜的制备及其超导性能

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.603

章彦田中, Tanaka Akira, 俊哉土井, Doi Toshiya, Iwasaki Ikumi, 育美岩崎, Hakuraku Yoshinori, 善則白樂, 仁北口, Kitaguchi Hitoshi, 高橋健一郎, Takahashi Ken-ichiro, 聰波多, Hata Satoshi

{"title":"Fabrication and Superconducting Properties of Alternately-layered MgB_2/Ni Thin Films with Different Ni-layer Spacing","authors":"章彦田中, Tanaka Akira, 俊哉土井, Doi Toshiya, Iwasaki Ikumi, 育美岩崎, Hakuraku Yoshinori, 善則白樂, 仁北口, Kitaguchi Hitoshi, 高橋健一郎, Takahashi Ken-ichiro, 聰波多, Hata Satoshi","doi":"10.2221/JCSJ.44.603","DOIUrl":"https://doi.org/10.2221/JCSJ.44.603","url":null,"abstract":"We will show the superconducting properties of alternately-layered MgB2/Ni thin films inserted as very thin (1 nm) nickel layers between MgB2 layers a few tens of nanometers thick. The MgB2/Ni thin films were prepared on silicon (100) substrates by sequentially switching electron-beam evaporation and coaxial vacuum arc evaporation techniques without post-annealing. In this study, we prepared alternately layered MgB2/Ni thin films with varying Ni-layer spacings. The Ni layer spacings were set to 32, 23 and 16 nm, respectively. The MgB2/Ni thin films were neither inter-diffusion nor chemical reactions between MgB2 and Ni. Clear enhancements of the Jc were observed in the MgB2/Ni thin films when the magnetic fields were applied parallel to the inserted Ni layers, and the peak positions in the Fp–B curves shifted to higher magnetic fields with the decrease of the Ni-layer spacing. These results clearly indicate that the Ni layers inserted in alternately-layered MgB2/Ni thin films work as very effective flux-pinning centers.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114876265","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}

引用次数: 2

Flux-pinning Properties and Microstructure in SmBa_2Cu_3O_y Thin Films with BaZrO_3 Nanorods 含BaZrO_3纳米棒SmBa_2Cu_3O_y薄膜的磁通钉钉性能和微观结构

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.549

T. Ozaki, Y. Yoshida, Y. Ichino, Y. Takai, A. Ichinose, K. Matsumoto, M. Mukaida, S. Horii

{"title":"Flux-pinning Properties and Microstructure in SmBa_2Cu_3O_y Thin Films with BaZrO_3 Nanorods","authors":"T. Ozaki, Y. Yoshida, Y. Ichino, Y. Takai, A. Ichinose, K. Matsumoto, M. Mukaida, S. Horii","doi":"10.2221/JCSJ.44.549","DOIUrl":"https://doi.org/10.2221/JCSJ.44.549","url":null,"abstract":"Self-organized BaZrO3 (BZO) nanorods in REBa2Cu3Oy superconducting films are known as promising artificial pinning centers. Previously, we have reported high-Jc Sm1+xBa2-xCu3Oy (SmBCO) films fabricated by a low-temperature growth (LTG) technique. The LTG technique expands the range of the deposition temperature in which the REBCO films show c-axis orientation, and makes it possible to control the crystal grain size and number density. In this study, in order to tune the pinning properties, we fabricated SmBCO films with BZO nanorods (LTG-SmBCO + BZO films) using the LTG technique and investigated the influence of the LTG technique on the growth of BZO nanorods and pinning properties in SmBCO films. With decreasing deposition temperature of the upper layer in the LTG-SmBCO + BZO films, the diameter of the films was decreased and the number density of BZO nanorods was increased, producing a high matching field, Bφ. Additionally, remarkable upturn shifts in the irreversibility field line and plateau regions in the magnetic-field dependence of Jc were observed in the range of Bφ/3 B Bφ. These results indicate that the nature of the Bose-glass-like state of vortices localized on c-axis-correlated pinning centers emerges in the range of Bφ/3 B Bφ.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128313684","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}

引用次数: 4

Angular Dependence of Electric Field vs. Current Density Characteristics in YBa_2Cu_3O_y Superconducting Thin Film with Columnar Defects 具有柱状缺陷的YBa_2Cu_3O_y超导薄膜中电场与电流密度特性的角依赖性

Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-12-25 DOI: 10.2221/JCSJ.44.517

T. Fujiyoshi, T. Sueyoshi, M. Haruta, K. Yonekura, T. Ikegami, N. Ishikawa, S. Awaji, Kazuo Watanabe

引用次数: 0