Y. Hamaji, M. Tokitani, R. Sakamoto, S. Masuzaki, H. Tamura, A. Sagara
ACT2 (Active Cooling Teststand 2), a high heat flux test facility using electron beam has been upgraded from ACT facility and started the operation. A new electron gun enables the steady state and transient heat load on actively cooled samples. ACT2 can achieve large loaded area with steady state reactor relevant heat flux (∼ 20 MW/m2) up to 200 × 200 mm2 and simulation of edge localized modes with short pulse length (∼ 100 μs). Beam profile was obtained about 9 mm with graphite probes. The heat flux is obtained by water calorimetry and measurement of the current through the samples.
{"title":"ACT2: a High Heat Flux Test Facility using Electron Beam for Fusion Application","authors":"Y. Hamaji, M. Tokitani, R. Sakamoto, S. Masuzaki, H. Tamura, A. Sagara","doi":"10.1585/PFR.11.2405089","DOIUrl":"https://doi.org/10.1585/PFR.11.2405089","url":null,"abstract":"ACT2 (Active Cooling Teststand 2), a high heat flux test facility using electron beam has been upgraded from ACT facility and started the operation. A new electron gun enables the steady state and transient heat load on actively cooled samples. ACT2 can achieve large loaded area with steady state reactor relevant heat flux (∼ 20 MW/m2) up to 200 × 200 mm2 and simulation of edge localized modes with short pulse length (∼ 100 μs). Beam profile was obtained about 9 mm with graphite probes. The heat flux is obtained by water calorimetry and measurement of the current through the samples.","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"589 1","pages":"281"},"PeriodicalIF":0.0,"publicationDate":"2016-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77312080","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}
As the capability of a supercomputer is improved, the sizes of simulation and its output data also become larger and larger. Visualization is usually carried out on a researcher’s PC with interactive visualization software after performing the computer simulation. However, the data size is becoming too large to do it currently. A promising answer is in-situ visualization. For this case a simulation code is coupled with the visualization code and visualization is performed with the simulation on the same supercomputer. We developed an in-situ visualization tool for particle-in-cell (PIC) simulation and it is provided as a Fortran’s module. We coupled it with a PIC simulation code and tested the coupled code on Plasma Simulator supercomputer, and ensured that it works.
{"title":"Development of In Situ Visualization Tool for PIC Simulation","authors":"N. Ohno, H. Ohtani","doi":"10.1585/PFR.9.3401071","DOIUrl":"https://doi.org/10.1585/PFR.9.3401071","url":null,"abstract":"As the capability of a supercomputer is improved, the sizes of simulation and its output data also become larger and larger. Visualization is usually carried out on a researcher’s PC with interactive visualization software after performing the computer simulation. However, the data size is becoming too large to do it currently. A promising answer is in-situ visualization. For this case a simulation code is coupled with the visualization code and visualization is performed with the simulation on the same supercomputer. We developed an in-situ visualization tool for particle-in-cell (PIC) simulation and it is provided as a Fortran’s module. We coupled it with a PIC simulation code and tested the coupled code on Plasma Simulator supercomputer, and ensured that it works.","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"17 1","pages":"434"},"PeriodicalIF":0.0,"publicationDate":"2015-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78764472","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 : 2015-04-14DOI: 10.1142/9789812831033_0007
T. Watanabe, G. Gnudi
{"title":"A New Algorithm for Differential-Algebraic Equations Based on HIDM","authors":"T. Watanabe, G. Gnudi","doi":"10.1142/9789812831033_0007","DOIUrl":"https://doi.org/10.1142/9789812831033_0007","url":null,"abstract":"","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"5 1","pages":"165"},"PeriodicalIF":0.0,"publicationDate":"2015-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89813531","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 : 2015-04-14DOI: 10.1007/978-94-009-0315-9_149
S. Takeuchi
{"title":"A Kinetic Model of Magnetic Field Reconnection","authors":"S. Takeuchi","doi":"10.1007/978-94-009-0315-9_149","DOIUrl":"https://doi.org/10.1007/978-94-009-0315-9_149","url":null,"abstract":"","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"1 1","pages":"581-582"},"PeriodicalIF":0.0,"publicationDate":"2015-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75485946","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 : 2014-12-19DOI: 10.13538/J.1001-8042/NST.25.S010401
Kawano Takao, Ohashi Hidemichi, Hamada Yohsei, and Jamsranjav Erdenetog
{"title":"Shielding effect on tritium water monitoring system based on CaF2 flow-cell detector","authors":"Kawano Takao, Ohashi Hidemichi, Hamada Yohsei, and Jamsranjav Erdenetog","doi":"10.13538/J.1001-8042/NST.25.S010401","DOIUrl":"https://doi.org/10.13538/J.1001-8042/NST.25.S010401","url":null,"abstract":"","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"155 1","pages":"157"},"PeriodicalIF":0.0,"publicationDate":"2014-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73690435","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 : 2014-02-12DOI: 10.1016/B978-008042688-4/50142-3
A. Iwamoto, T. Mito, K. Takahata, N. Yanagi, J. Yamamoto
{"title":"Heat Transfer Characteristics of a Prototype Pool Boiling Superconductor to Liquid Helium","authors":"A. Iwamoto, T. Mito, K. Takahata, N. Yanagi, J. Yamamoto","doi":"10.1016/B978-008042688-4/50142-3","DOIUrl":"https://doi.org/10.1016/B978-008042688-4/50142-3","url":null,"abstract":"","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"67 1","pages":"40"},"PeriodicalIF":0.0,"publicationDate":"2014-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82265606","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}
{"title":"\"Hot Electron Spectra in Plain, Cone and Integrated Targets for FIREX-I Using Electron Spectrometer\"","authors":"T. Ozaki, H. Shiraga, Y. Arikawa","doi":"10.1585/PFR.8.2404125","DOIUrl":"https://doi.org/10.1585/PFR.8.2404125","url":null,"abstract":"","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"101 1","pages":"540"},"PeriodicalIF":0.0,"publicationDate":"2013-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75277561","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 : 2013-02-20DOI: 10.1051/EPJCONF/20123202007
S. Kubo, H. Takahashi, T. Shimozuma, Y. Yoshimura, M. Nishiura, H. Igami, S. Ogasawara, R. Makino
The central bulk electron temperature of more than 20 keV is achieved in LHD as a result of increasing the injection power and the lowering the electron density near 2 10 18 m 3 . Such collision-less regime is important from the aspect of the neoclas- sical transport and also the potential structure formation. The presences of appreciable amount of high energy electrons are indicated from hard X-ray PHA, and the discrep- ancy between the stored energy and kinetic energy estimated from Thomson scattering. ECE spectrum are also sensitive to the presence of high energy electrons and discussed by solving the radiation transfer equation. The ECRH power absorption to the bulk and the high energy electrons are dramatically affected by the acceleration and the confinement of high energy electrons. The heating mechanisms and the acceleration process of high energy electrons are discussed by comparing the experimental results and the ray tracing calculation under assumed various density and mean energy of high energy electrons.
{"title":"Influence of High Energy Electrons on ECRH in LHD","authors":"S. Kubo, H. Takahashi, T. Shimozuma, Y. Yoshimura, M. Nishiura, H. Igami, S. Ogasawara, R. Makino","doi":"10.1051/EPJCONF/20123202007","DOIUrl":"https://doi.org/10.1051/EPJCONF/20123202007","url":null,"abstract":"The central bulk electron temperature of more than 20 keV is achieved in LHD as a result of increasing the injection power and the lowering the electron density near 2 10 18 m 3 . Such collision-less regime is important from the aspect of the neoclas- sical transport and also the potential structure formation. The presences of appreciable amount of high energy electrons are indicated from hard X-ray PHA, and the discrep- ancy between the stored energy and kinetic energy estimated from Thomson scattering. ECE spectrum are also sensitive to the presence of high energy electrons and discussed by solving the radiation transfer equation. The ECRH power absorption to the bulk and the high energy electrons are dramatically affected by the acceleration and the confinement of high energy electrons. The heating mechanisms and the acceleration process of high energy electrons are discussed by comparing the experimental results and the ray tracing calculation under assumed various density and mean energy of high energy electrons.","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"1 1","pages":"98"},"PeriodicalIF":0.0,"publicationDate":"2013-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90739080","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}
I. Tolstikhina, V. P. Shevelko, D. Kato, I. Murakami, H. Sakaue
The influence of the isotope effect (mass dependence) on the charge exchange process in low-energy collisions of ions and atoms sputtered from Plasma Facing Components (PFC) with hydrogen isotopes (H, D and T) is studied using the adiabatic theory of transitions in slow collisions developed by E. Solov’ev [Sov. Phys. Uspekhi 32, 228 (1989) [1]]. Results of the numerical calculations are presented for the charge-exchange cross sections of Li, Be, C ions colliding with hydrogen isotopes and for the inverse reactions.
{"title":"Influence of the Isotope Effect on the Charge-exchange Process between Hydrogen Isotopes and Ions and Atoms of Plasma Facing Component Materials","authors":"I. Tolstikhina, V. P. Shevelko, D. Kato, I. Murakami, H. Sakaue","doi":"10.1585/PFR.7.2401078","DOIUrl":"https://doi.org/10.1585/PFR.7.2401078","url":null,"abstract":"The influence of the isotope effect (mass dependence) on the charge exchange process in low-energy collisions of ions and atoms sputtered from Plasma Facing Components (PFC) with hydrogen isotopes (H, D and T) is studied using the adiabatic theory of transitions in slow collisions developed by E. Solov’ev [Sov. Phys. Uspekhi 32, 228 (1989) [1]]. Results of the numerical calculations are presented for the charge-exchange cross sections of Li, Be, C ions colliding with hydrogen isotopes and for the inverse reactions.","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"38 1","pages":"325"},"PeriodicalIF":0.0,"publicationDate":"2012-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90525293","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}
M. Emoto, C. Suzuki, M. Yoshida, Yasuhiro Suzuki, K. Ida, Y. Nagayama
More than 100 diagnostic devices are attached to the vacuum vessel of the Large Helical Device (LHD); they measure various aspects of the plasma physics. Because the shape of the LHD plasma is not symmetric, each diagnostic obtains the physical values in a different cross section. For example, the Thomson scattering system measures the electron temperature profile in the horizontally elongated cross section, and the laser interferometer measures the line-integrated electron density profile in the vertically elongated cross section. To analyze the data obtained by different diagnostics, their measurement positions must be mapped to a unified coordinate system, the flux coordinate system. Therefore, the authors have been building a database to map the physical coordinates to the flux coordinates. A system for mapping the electron temperature profile to the flux coordinates, TSMAP, has been developed using the database. The profiles calculated by TSMAP are fundamental data for analyzing the plasma physics during an experiment. Therefore, they must be obtained as soon as possible. However, the execution of TSMAP requires computational power, and the performance of a typical personal computer is not high enough to keep up with the 3-min plasma discharge cycle. To increase the performance, the authors use a parallel computing approach. Because the fitting calculation for each time is independent, the calculations for different times can be executed simultaneously. Using this approach, the authors increased the performance by 25 times, achieving a 25-s execution time.
{"title":"Performance Improvement in Real-Time Mapping of Thomson Scattering Data to Flux Coordinates in LHD","authors":"M. Emoto, C. Suzuki, M. Yoshida, Yasuhiro Suzuki, K. Ida, Y. Nagayama","doi":"10.1585/PFR.7.2405058","DOIUrl":"https://doi.org/10.1585/PFR.7.2405058","url":null,"abstract":"More than 100 diagnostic devices are attached to the vacuum vessel of the Large Helical Device (LHD); they measure various aspects of the plasma physics. Because the shape of the LHD plasma is not symmetric, each diagnostic obtains the physical values in a different cross section. For example, the Thomson scattering system measures the electron temperature profile in the horizontally elongated cross section, and the laser interferometer measures the line-integrated electron density profile in the vertically elongated cross section. To analyze the data obtained by different diagnostics, their measurement positions must be mapped to a unified coordinate system, the flux coordinate system. Therefore, the authors have been building a database to map the physical coordinates to the flux coordinates. A system for mapping the electron temperature profile to the flux coordinates, TSMAP, has been developed using the database. The profiles calculated by TSMAP are fundamental data for analyzing the plasma physics during an experiment. Therefore, they must be obtained as soon as possible. However, the execution of TSMAP requires computational power, and the performance of a typical personal computer is not high enough to keep up with the 3-min plasma discharge cycle. To increase the performance, the authors use a parallel computing approach. Because the fitting calculation for each time is independent, the calculations for different times can be executed simultaneously. Using this approach, the authors increased the performance by 25 times, achieving a 25-s execution time.","PeriodicalId":7974,"journal":{"name":"Annual Report of National Institute for Fusion Science","volume":"313 1","pages":"39"},"PeriodicalIF":0.0,"publicationDate":"2012-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77623774","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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