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Superconducting Magnet for the JT-60SA JT-60SA超导磁体
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-08-25 DOI: 10.2221/JCSJ.44.346
Kiyoshi Yoshida
{"title":"Superconducting Magnet for the JT-60SA","authors":"Kiyoshi Yoshida","doi":"10.2221/JCSJ.44.346","DOIUrl":"https://doi.org/10.2221/JCSJ.44.346","url":null,"abstract":"The upgrading of the JT-60U to the JT-60SA has started in a joint effort by the Japanese government (JA) and European commission (EU) under the framework of the Broader Approach (BA) Agreement. The superconducting magnet system for the JT-60SA consists of 18 toroidal field (TF) coils, a central solenoid (CS) with four modules, and six equilibrium field (EF) coils. The TF case encloses the winding pack and is the main structural component of the magnet system. The CS consists of independent winding pack modules, which are hung from the top of the TF coils through its pre-load structure. The six EF coils are attached to the TF coil case through supports with flexible plates that allow radial displacement. The CS modules operate at high field and use a Nb3Sn superconductor. The TF coils and EF coils use NbTi superconductors. This paper describes the technical requirements, operational interface and detailed manufacturing design outline of the superconducting magnet system for the JT-60SA.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114756532","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
TFA-MOD プロセスにおけるマルチターン式 Reel-to-Reel 本焼成炉の開発 tft - mod工艺中的多轮式Reel-to-Reel本烧结炉的开发
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-04-25 DOI: 10.2221/JCSJ.44.164
正志 三浦, 裕士 市川, 泰範 須藤, 正晃 吉積, 穣 山田, 輝郎 和泉, 融 塩原
{"title":"TFA-MOD プロセスにおけるマルチターン式 Reel-to-Reel 本焼成炉の開発","authors":"正志 三浦, 裕士 市川, 泰範 須藤, 正晃 吉積, 穣 山田, 輝郎 和泉, 融 塩原","doi":"10.2221/JCSJ.44.164","DOIUrl":"https://doi.org/10.2221/JCSJ.44.164","url":null,"abstract":"We developed a new multi-turning system reel-to-reel (MT-RTR) system furnace with a vertical gas flow mode to increase the production rate of the crystallization step and attained a uniform reaction for the tapes in the multi-turn system. We fabricated YBCO films with different conditions including partial pressures of water vapor, the total pressure and the gas flow volume using the MT-RTR furnace with the vertical gas flow system, in order to investigate these influence of the processing parameters on the growth rate and the superconducting properties of the YBCO films. It was found that the growth rate of the YBCO layer increased under the conditions of the high gas flow rate, the low total pressure and the high partial water vapor pressure. As a result, 21 times higher Jc value was attained with the 17 times faster growth rate than that before optimizing the processing parameters in the crystallization step. This is thought to be due to the suppression of the coarsening of Y2Cu2O5 and CuO particles in the precursor film. Consequently, a high Ic,end-to-end value of 250 A/cm-w was achieved in a 5 m-long tape fabricated at a production rate of 3 m/h using only 2 lanes of the entire MT-RTR crystallization furnace originally designed for 10 lanes.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117301911","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: 1
Fundamental Study on Generation Characteristics of a HTS Induction/Synchronous Machine 高温超导感应/同步电机发电特性的基础研究
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-03-25 DOI: 10.2221/JCSJ.44.112
Taketsune Nakamura, Y. Ogama, K. Matsumura, T. Nishimura, K. Nagao, N. Kashima, S. Nagaya
{"title":"Fundamental Study on Generation Characteristics of a HTS Induction/Synchronous Machine","authors":"Taketsune Nakamura, Y. Ogama, K. Matsumura, T. Nishimura, K. Nagao, N. Kashima, S. Nagaya","doi":"10.2221/JCSJ.44.112","DOIUrl":"https://doi.org/10.2221/JCSJ.44.112","url":null,"abstract":"This paper describes a fundamental study on the generation characteristics of a high Tc superconducting induction/synchronous machine (HTS-ISM), with a structure the same as squirrel-cage induction machines. Bi-2223/Ag multifilamentary tapes are utilized for the fabrication of the secondary windings, and a commercialized 3-phase, 4-pole stator is introduced. The fabricated HTS-ISM is immersed in liquid nitrogen, and then operated at a frequency of 60 Hz. It is shown for the first time that our HTS machine can generate active power at synchronous speed when the primary windings are excited. This indicates that synchronous generation can be realized with the simple structure of HTS-ISM.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125119443","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: 9
Methods for Estimating the Radiation Heat Transfer in Metal Pipe 金属管道辐射传热的估算方法
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2009-02-25 DOI: 10.2221/JCSJ.44.77
T. Tomaru
{"title":"Methods for Estimating the Radiation Heat Transfer in Metal Pipe","authors":"T. Tomaru","doi":"10.2221/JCSJ.44.77","DOIUrl":"https://doi.org/10.2221/JCSJ.44.77","url":null,"abstract":"The heat transfer equation derived from the Stefan-Boltzmann law is frequently used to calculate the heat load due to thermal radiation in a cryogenic apparatus. This equation expresses heat transfer from one surface to the other, and includes no information on structures between these surfaces. In the case of thermal radiation through a metal pipe, which exists between different temperature regions, its reflection and conduction in the pipe (funneling) have to be considered. This effect is much larger than the simple estimation derived from the solid angle between these temperature regions. In this paper, the heat transfer equation derived from a ray-trace model and an experiment conducted to confirm it are described. Moreover, the reduction experiment of this heat load using metal baffles is also reported.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134406940","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
Double-loop Thermoacoustic Stirling Cooler : II. Measurements of Acoustic Streaming Velocity 双回路热声斯特林冷却器:2。声流速度的测量
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2008-12-25 DOI: 10.2221/JCSJ.43.543
T. Biwa
{"title":"Double-loop Thermoacoustic Stirling Cooler : II. Measurements of Acoustic Streaming Velocity","authors":"T. Biwa","doi":"10.2221/JCSJ.43.543","DOIUrl":"https://doi.org/10.2221/JCSJ.43.543","url":null,"abstract":"In thermoacoustic devices with a looped tube, it has been pointed out that acoustic streaming circulating the loop leads to unwanted heat loss. In this research,, we measured the acoustic streaming velocity in a double-loop thermoacoustic Stirling cooler, and show that the streaming circulating the loop accounts for a heat loss of 150 W when input heat to the prime-mover loop is 408 W. It is also shown that the installation of an elastic membrane effectively suppresses the heat loss and thereby increases the performance of the prime-mover loop and cooler loop.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122985695","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
Double-loop Thermoacoustic Stirling Cooler : I. Work Flow Measurements 双回路热声斯特林冷却器:1 .工作流程测量
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2008-12-25 DOI: 10.2221/JCSJ.43.536
T. Biwa
{"title":"Double-loop Thermoacoustic Stirling Cooler : I. Work Flow Measurements","authors":"T. Biwa","doi":"10.2221/JCSJ.43.536","DOIUrl":"https://doi.org/10.2221/JCSJ.43.536","url":null,"abstract":"We built and tested a double-loop thermoacoustic Stirling cooler. The cooler consists of a prime-mover loop, a branch resonator and a cooler loop. Work flow measurements were conducted to evaluate the efficiency of the cooler. It was found that efficiency corresponding to 6.6% of the Carnot efficiency was expected for the prime-mover loop, whereas a Carnot efficiency of 11.5% was expected for the cooler loop. Measurement of heat rejected by cooling water showed that unwanted heat loss significantly lowered the efficiency in the prime-mover loop. When the effective input heat to the regenerator was used to estimate the efficiency, the efficiency was found to be 20.4% of the Carnot efficiency, comparable to that of mechanical Stirling engines.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"299 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130118395","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: 1
超伝導リングサイクロトロン（SRC）の概要 超导环形回旋加速器(SRC)简介
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2008-11-25 DOI: 10.2221/JCSJ.43.452
広樹 奥野
{"title":"超伝導リングサイクロトロン（SRC）の概要","authors":"広樹 奥野","doi":"10.2221/JCSJ.43.452","DOIUrl":"https://doi.org/10.2221/JCSJ.43.452","url":null,"abstract":"The RIKEN Nishina Center began construction of the Radioactive Isotope Beam Factory (RIBF) in 1997, and succeeded in commissioning the beam of its accelerator complex at the end of 2006. The world’s first superconducting ring cyclotron (SRC) is the final booster in the RIBF accelerator complex. It is capable of accelerating all-element heavy ions to a speed of about 70% of the speed of light. Assembly of the superconducting sector magnets was completed in August 2005. The superconducting coils were successfully cooled down and excited for tests on many operational aspects: magnetic force, coil protection and quality of magnetic field, showing that they work as designed. After a series of tests the other components were installed and tested under stray fields from the sector magnets. Local magnetic shields were supplied for the components that could not work under the stray fields. After setting the beam vacuum and radio frequency, beam commissioning started. The first beam was extracted at the end of 2006, and the first uranium beam was extracted in March 2007.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126192546","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
Quantitative Analysis of Normal Zone Propagation in MgB2 Superconducting Wires MgB2超导导线中正常区传播的定量分析
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2008-10-25 DOI: 10.2221/JCSJ.43.423
和夫 船木, Funaki Kazuo, Kubo Teruaki, 輝朗 久保, Nakao Akihiro, 彰浩 中尾, Sato Seiki, 誠樹 佐藤, 政晃 松尾, Matsuo Masaaki, 一弘 柁川, Kajikawa Kazuhiro, 和英 田中, Tanaka Kazuhide, Okada Michiya, 道哉 岡田, Kumakura Hiroaki, 浩明 熊倉, 秀美 林, Hayashi Hidemi
{"title":"Quantitative Analysis of Normal Zone Propagation in MgB2 Superconducting Wires","authors":"和夫 船木, Funaki Kazuo, Kubo Teruaki, 輝朗 久保, Nakao Akihiro, 彰浩 中尾, Sato Seiki, 誠樹 佐藤, 政晃 松尾, Matsuo Masaaki, 一弘 柁川, Kajikawa Kazuhiro, 和英 田中, Tanaka Kazuhide, Okada Michiya, 道哉 岡田, Kumakura Hiroaki, 浩明 熊倉, 秀美 林, Hayashi Hidemi","doi":"10.2221/JCSJ.43.423","DOIUrl":"https://doi.org/10.2221/JCSJ.43.423","url":null,"abstract":"Synopsis: As a thermal property of MgB2 wires, we observed the propagation velocity of a normal zone for those immersed in liquid helium. The normal zone propagation was initiated by a resistive heater and the propagation velocity was estimated from the response of voltage difference between potential taps attached to the wire in a transverse magnetic field. The specimen was a mono-filamentary bare wire with a composite sheath of iron and copper. A part of the wire was cooled directly by liquid helium and the other was covered with a vacuum-grease layer for thermal insulation. The propagation velocity observed in each part was of a very low level in comparison with typical ones for usual NbTi wires, which may come from the high critical temperature and the low overall current density. We numerically calculate the propagation velocity with transient cooling models and discuss the normal zone propagation in relation to the cooling processes. We also evaluated the propagation of the normal zone in the MgB2 wires with advanced transport properties, which were attained in short specimens, under the condition of conduction cooling in a wide range of operation temperatures.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127169707","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: 1
Transport Properties of Bi_2Sr_2CaCu_2O_8 Materials with In-field Heat-treatment 场内热处理Bi_2Sr_2CaCu_2O_8材料的输运性质
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2008-09-25 DOI: 10.2221/JCSJ.43.387
Inoue Takushi, S. Awaji, K. Takahashi, P. Badica, G. Nishijima, Kazuo Watanabe
{"title":"Transport Properties of Bi_2Sr_2CaCu_2O_8 Materials with In-field Heat-treatment","authors":"Inoue Takushi, S. Awaji, K. Takahashi, P. Badica, G. Nishijima, Kazuo Watanabe","doi":"10.2221/JCSJ.43.387","DOIUrl":"https://doi.org/10.2221/JCSJ.43.387","url":null,"abstract":"The transport properties for in-field heat-treated monocore and multicore Bi2Sr2CaCu2O8 (Bi2212) tapes and multicore Bi2212 round wires were measured in detail. We found that the in-field heat-treatment enhances not only the critical current density Jc but also the n-value for all samples used in this study. These enhancements for the monocore tapes were more remarkable, compared in those of the multicore tapes and wires. Therefore the in-field heat-treatment is more effective for the Bi2212 tapes with a large core size. Microstructure observation shows that the grain size of the monocore tapes decreases as the result of in-field heat treatment. The analysis based on the percolation model related to the local Jc distribution suggests that the in-field heat-treatment increases the m-value, which determines the shape of the local Jc distribution and is related to the n-values. The two Jc distribution model can explain that the increases in n- and m-values are due to the decreases in the aspect ratio of the grains during in-field heat treatment.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128282306","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
シャドウグラフ法による狭い平行平板間内に現れる過熱He II-過熱He I界面の可視化 在狭窄平行平板之间出现的过热He II-过热He I界面通过阴影图可视化
Teion Kogaku (journal of The Cryogenic Society of Japan) Pub Date : 2008-03-25 DOI: 10.2221/JCSJ.43.94
卓雄 高田, 正秀 村上, 誠宏 木村, 久恭 小林
{"title":"シャドウグラフ法による狭い平行平板間内に現れる過熱He II-過熱He I界面の可視化","authors":"卓雄 高田, 正秀 村上, 誠宏 木村, 久恭 小林","doi":"10.2221/JCSJ.43.94","DOIUrl":"https://doi.org/10.2221/JCSJ.43.94","url":null,"abstract":"A study on visualization of superheated He II —superheated He I interface in a narrow channel between parallel walls as a result of heating was investigated using a shadowgraph method. It was confirmed that a superheated state was readily created in the narrow channel that simulates cooling channels of superconducting magnets. Superheated He II-superheated He I interface transiently appeared above 2.0 K up to lambda temperature when applying small heat flux. The boiling accompanying with superheated He II- superheated He I interface that was repeatedly generated and collapsed was found to have a high heat transfer coefficient.","PeriodicalId":285677,"journal":{"name":"Teion Kogaku (journal of The Cryogenic Society of Japan)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133985431","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: 1
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