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Journal Articles

Simulation of discharge in insulating gas from initial partial discharge to growth of a stepped leader using the percolation model

Sasaki, Akira; Kato, Susumu*; Takahashi, Eiichi*; Kishimoto, Yasuaki*; Fujii, Takashi*; Kanazawa, Seiji*

Japanese Journal of Applied Physics, 55(2), p.026101_1 - 026101_10, 2016/02

 Times Cited Count:2 Percentile:9.75(Physics, Applied)

A percolation model of discharge, which can reproduce stochastic behaviors of initial partial discharge to the growth of a stepped leader, is presented. The model uses macroscopic cells, from which a network of electric circuits is defined, and the spatial and temporal evolutions of the electric field and current in the discharge medium are calculated. For each cell, one of two states, either insulator or conductor, which corresponds to neutral gas or ionized plasmas, respectively, is decided. The decision is made on the basis of probability for each calculation cell at each time step, taking the effects of local electric field and current, which enhance ionization and sustain the discharge channel, respectively, into account. The stochastic behavior of discharge is discussed, in conjunction with the characteristic feature of ionization, that is, the ionization occurs not only ahead of the streamer tip where the electric field is enhanced but randomly in the discharge medium.

Journal Articles

A Percolation model of the streamer discharges

Sasaki, Akira; Kato, Susumu*; Takahashi, Eiichi*; Kanazawa, Seiji*

JPS Conference Proceedings (Internet), 1, p.015029_1 - 015029_4, 2014/03

Although streamer discharges have long been studied, the mechanism of sudden formation of the complex discharge path has not been fully understood. We show that a simulation based on the percolation model reproduces such development of the streamer. In the model, the discharge medium is divided into cells and is considered to form an electrical circuit network, which is used to calculate the current. In contrast to the characteristic feature of a single electron avalanche is explained by the Townsend theory, when the size of the system becomes greater, random formation of the avalanche in the medium and connection between them determines the propagation of the steamer, which is analyzed using the percolation model. Figure shows the simulated discharge from the initial pre-discharge activity near the electrode to rapid growth of the stepped leader, which causes breakdown.

Journal Articles

Percolation simulation of laser-guided electrical discharges

Sasaki, Akira; Kishimoto, Yasuaki*; Takahashi, Eiichi*; Kato, Susumu*; Fujii, Takashi*; Kanazawa, Seiji*

Physical Review Letters, 105(7), p.075004_1 - 075004_4, 2010/08

 Times Cited Count:10 Percentile:55.4(Physics, Multidisciplinary)

A three-dimensional simulation of laser guided-discharges based on the percolation is presented. The model includes both local growth of a streamer due to the enhanced electric field at the tip and propagation of a leader by remote ionization such that caused by runaway electrons. The stochastic behavior of the discharge through preformed plasma channel is reproduced by the calculation, which shows complex path with detouring and bifurcation. The probability of guiding is investigated with respect to the ionized, conductive fraction along the channel.

Journal Articles

Shaking table tests with large test specimens of seismically isolated FBR plants, 3; Ultimate behavior of upper structure and rubber bearings

Yabana, Shuichi*; Kanazawa, Kenji*; Nagata, Seiji*; Kitamura, Seiji; Sano, Takeshi*

Proceedings of 2009 ASME Pressure Vessels and Piping Division Conference (PVP 2009) (CD-ROM), 9 Pages, 2009/07

JAEA Reports

Experimental study on accelerator driven subcritical reactor, JAERI's nuclear research promotion program, H12-031 (Contract research)

Shiroya, Seiji*; Misawa, Tsuyoshi*; Unesaki, Hironobu*; Ichihara, Chihiro*; Kobayashi, Keiji*; Nakamura, Hiroshi*; Shin, Kazuo*; Imanishi, Nobutsugu*; Kanazawa, Satoshi*; Mori, Takamasa

JAERI-Tech 2004-025, 93 Pages, 2004/03

JAERI-Tech-2004-025.pdf:6.69MB

In view of the future plan of Research Reactor Institute, Kyoto University, the present study consisted of (1) the transmission experiments of high energy neutrons through materials, (2) experimental simulation of ADSR using the Kyoto University Critical Assembly(KUCA), and (3) conceptual neutronics design study on KUR type ADSR using the MCNP-X code. Through the present study, valuable knowledge on the basic nuclear characteristics of ADSR, which is indispensable to promote the study on ADSR, was obtained both theoretically and experimentally. For the realization of ADSR, it is considered to be necessary to accumulate results of research steadily. For this purpose, it is inevitable (1) to compile the more precise nuclear data for the wide energy range, (2) to establish experimental techniques for reactor physics study on ADSR including subcriticality measurement and absolute neutron flux measurement, and (3) to develop neutronics calculation tools which take into account the neutron generation process by the spallation reaction and the delayed neutron behavior.

Oral presentation

Ultimate behavior test of seismically isolated FBR plants with a large shaking table, 2; Test specimen and loading method

Yabana, Shuichi*; Kanazawa, Kenji*; Hirata, Kazuta*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Ultimate behavior test of seismically isolated FBR plants with a large shaking table, 7; Specimen structural health monitoring

Kanazawa, Kenji*; Nagata, Seiji*; Yabana, Shuichi*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Ultimate behavior tests of seismic isolation system for FBR with a large shaking table, 6; Simulation of ultimate behavior tests

Yabana, Shuichi*; Kanazawa, Kenji*; Nagata, Seiji*; Inaba, Satoru*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Simulation of probability and structure formation of discharge with percolation model

Sasaki, Akira; Takahashi, Eiichi*; Kato, Susumu*; Kishimoto, Yasuaki*; Kanazawa, Seiji*; Fujii, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Ultimate behavior tests of seismic isolation system for FBR with a large shaking table, 7; Modal identification based on test results

Nagata, Seiji*; Kanazawa, Kenji*; Hirata, Kazuta*; Sano, Takeshi*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Ultimate behavior tests of seismic isolation system for FBR with a large shaking table, 8; Horizontal dynamic characteristics of base-isolation system specimens

Kanazawa, Kenji*; Yabana, Shuichi*; Hirata, Kazuta*; Nakamura, Takashi*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Ultimate behavior tests of seismic isolation system for FBR with a large shaking table, 11; Evaluation of analytical models for ultimate behavior of seismically isolated structures

Yabana, Shuichi*; Kanazawa, Kenji*; Hirata, Kazuta*; Umeki, Katsuhiko*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Dynamic behavior of seismic base-isolated structure during large shaking table tests

Kanazawa, Kenji*; Nagata, Seiji*; Yabana, Shuichi*; Hirata, Kazuta*; Umeki, Katsuhiko*; Kitamura, Seiji

no journal, , 

no abstracts in English

Oral presentation

Percolation simulation of electrical discharges

Sasaki, Akira; Takahashi, Eiichi*; Kato, Susumu*; Kishimoto, Yasuaki*; Fujii, Takashi*; Kanazawa, Seiji*; Torii, Tatsuo

no journal, , 

no abstracts in English

Oral presentation

Discharge simulation using the percolation model

Sasaki, Akira; Torii, Tatsuo; Takahashi, Eiichi*; Kato, Susumu*; Kishimoto, Yasuaki*; Kanazawa, Seiji*; Fujii, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Percolation simulation of lightning discharge and analysis of laser-guided discharges

Sasaki, Akira; Torii, Tatsuo; Kato, Susumu*; Takahashi, Eiichi*; Fujii, Takashi*; Kanazawa, Seiji*; Kishimoto, Yasuaki*

no journal, , 

no abstracts in English

Oral presentation

Simulation of development of leader and streamer based on the percolation model

Sasaki, Akira; Takahashi, Eiichi*; Kato, Susumu*; Kishimoto, Yasuaki*; Fujii, Takashi*; Kanazawa, Seiji*

no journal, , 

The discharge simulation based on the percolation model is extended to include the dynamics of formation and extincition of the ionized region in the gas, and the temporal evolution of discharge current is calculated taking spatial capacitance and inductance into account. Calculations show prebreakdown activity appears in front of the protrution on the electrode after some delay from a high voltage is applied across the gap, which is followed by the development of the stepped leader and the establishment of a discharge path between the electrondes.

Oral presentation

Modeling discharge phenomena and simulation of stepped leaders

Sasaki, Akira; Kato, Susumu*; Takahashi, Eiichi*; Fujii, Takashi*; Kanazawa, Seiji*; Kishimoto, Yasuaki*

no journal, , 

no abstracts in English

Oral presentation

Modeling discharge phenomena and simulation of stepped leaders

Sasaki, Akira; Kato, Susumu*; Takahashi, Eiichi*; Fujii, Takashi*; Kanazawa, Seiji*; Kishimoto, Yasuaki*

no journal, , 

no abstracts in English

Oral presentation

Modeling of the temporal and spatial structure of discharge

Sasaki, Akira; Torii, Tatsuo; Takahashi, Eiichi*; Kato, Susumu*; Fujii, Takashi*; Kanazawa, Seiji*; Kishimoto, Yasuaki*

no journal, , 

no abstracts in English

31 (Records 1-20 displayed on this page)