Search Results 1-20 of 364

  • Magnetoclinicity effect in compressible magnetohydrodynamic turbulence  [in Japanese]

    YOKOI Nobumitsu

    <p>多重スケールくりこみ摂動展開の方法で,強い圧縮性をもつ電磁流体乱流の乱流相関を解析した結果を示す.平均磁場の誘導方程式での乱流効果を表す乱流起電力には,非圧縮性で見られる通常のダイナモ諸項に加えて,圧縮性に固有の項が現れ,輸送係数が密度分散(密度ゆらぎの大きさ)で表される.特に,平均の密度勾配と磁場の傾きによる項があり,「傾磁場効果」(magnetoclinicity)と名付けら …

    SEISAN KENKYU 72(1), 25-29, 2020

    J-STAGE 

  • Correlation between MHD instability and hollow SXR emissivity distribution in RFP  [in Japanese]

    Sanpei Akio , Akiyama Tsuyoshi , Masamune Sadao , Yoshioka Satoshi , Okamoto Takayuki , Kai Eisaku , Masamichi Yu , Himura Haruhiko , Ohdachi Satoshi , Mizuguchi Naoki

    Meeting Abstracts of the Physical Society of Japan 73.2(0), 410-410, 2018

    J-STAGE 

  • Nonlinear growth of the Richtmyer-Meshkov instability in magnetized plasmas and magnetic field amplification  [in Japanese]

    Sano T. , Nishihara K. , Matsuoka C. , Wouchuk J. G.

    Meeting Abstracts of the Physical Society of Japan 73.1(0), 865-865, 2018

    J-STAGE 

  • Heuristic explanation of interchange instability in ideal MHD framework  [in Japanese]

    Ichiguchi Katsuji

    Meeting Abstracts of the Physical Society of Japan 73.1(0), 796-796, 2018

    J-STAGE 

  • Comparison of Rotation of Interchange Mode in Large Helical Device Plasmas with Various Ion Species

    TAKEMURA Yuki , WATANABE Kiyomasa , SAKAKIBARA Satoru , OHDACHI Satoshi , SUZUKI Yasuhiro , IDA Katsumi , YOSHINUMA Mikiro , YAMADA Ichihiro , LHD Experiment Group

    … <p>In order to clarify the mass effect and the atomic number effect on the rotation of the interchange MHD mode, the relationship between the mode rotation and the plasma rotation in hydrogen-rich plasmas is compared with that in helium-rich plasmas and deuterium-rich plasmas. …

    Plasma and Fusion Research 13(0), 3402037-3402037, 2018

    J-STAGE 

  • MHD Simulation of Merging Fueling Method Used for ST Plasma

    KOIKE Shintaro , TAKAHASHI Toshiki , MIZUGUCHI Naoki , MITARAI Osamu

    … <p>Three-dimensional resistive MHD simulation was carried out in order to develop a method to fuel the plasma core by merging two Spherical Torus (ST) plasmas. … A relatively small ST plasma was translated into the axial direction by external magnetic field control and made to collide with the larger ST. In this calculation, ballooning instability occurred in both plasmas during translation, while the magnetic surface was observed to collapse from the Poincare plot of the magnetic lines. …

    Plasma and Fusion Research 13(0), 1203008-1203008, 2018

    J-STAGE 

  • Influence of Inlet Ionization Degree on Performance of Seed-free MHD Generator  [in Japanese]

    Tsuruoka Mio , Tanaka Manabu , Okuno Yoshihiro

    … <p>Power generating characteristics of seed-free linear shaped Faraday type and disk shaped Hall type MHD generators are examined by two-dimensional numerical simulation with changing the inlet ionization degree. … At low inlet ionization degree, on the other hand, ionization instability occurs and the enthalpy extraction ratio decreases. … The net enthalpy extraction ratio decreases for an excessive inlet ionization degree because of a strong MHD interaction.</p> …

    IEEJ Transactions on Power and Energy 138(3), 236-241, 2018

    J-STAGE 

  • Short-wavelength analysis of magnetorotational instability of resistive MHD flows (Mathematical Analysis of Viscous Incompressible Fluid)

    Fukumoto Yasuhide , Zou Rong , Kirillov Oleg

    … For perfectly conducting fluid (ideal MHD), we use the Hain-Lüst equation, capable of dealing with perturbations over a wide range of the axial wavenumber k to take short wavelength approximation. …

    数理解析研究所講究録 (2058), 78-89, 2017-10

    IR 

  • Non-MHD effects in the nonlinear development of the MHD-scale Rayleigh-Taylor instability

    Takayuki Umeda , Yasutaka Wada

    … The nonlinear evolution of the Rayleigh-Taylor instability (RTI) at a density shear layer transverseto magnetic field in a collisionless plasma is investigated by means of a fully kineticVlasov simulation with two spatial and two velocity dimensions. … The primary RTI in the Hall-MHD regime develops asymmetrically in acoordinate axis parallel to gravity. …

    Physics of Plasmas (24), 072307-072307, 2017-07-07

    IR 

  • Nonlinear Dynamics of Non-uniform Current-Vortex Sheets in Magnetohydrodynamic Flows

    Matsuoka C , Nishihara K , Sano T

    Journal of Nonlinear Science 27(2), 531-572, 2017-04

    IR 

  • Development of Beam Emission Spectroscopy : Clarifying Spatiotemporal Structure of MHD and Turbulent Fluctuations  [in Japanese]

    小林 進二

    プラズマ・核融合学会誌 = Journal of plasma and fusion research 93(1), 2-9, 2017-01

  • Correlation between MHD instability and three dimensional structure of RFP  [in Japanese]

    Sanpei Akio , Mizuguchi Naoki , Akiyama Tsuyoshi , Masamune Sadao , Tsuboi Ryosuke , Nakanoboh Shun , Emori M. , Kunita Satoshi , Makizawa Haruka , Himura Haruhiko , Ohdachi Satoshi

    … て自発的にヘリカル変形した領域内で高βプラズマが実現する現象が観測されている.低アスペクト比RFP装置「RELAX」において,ヘリカル可視光源の回転/非回転と周辺トロイダル磁場の反転度合い,並びに主要モードの振る舞いとが相関を示す結果が得られている.本講演では,周辺磁場揺動解析結果と軟X線画像及び可視光像の時間発展計測の結果から,RFPにおけるMHD不安定性と三次元構造の相関を議論する.</p> …

    Meeting Abstracts of the Physical Society of Japan 72.1(0), 873-873, 2017

    J-STAGE 

  • Experimental Study on Slowing-Down Mechanism of Locked-Mode-Like Instability in LHD

    TAKEMURA Yuki , YOSHINUMA Mikiro , TSUCHIYA Hayato , YAMADA Ichihiro , LHD Experiment Group , WATANABE Kiyomasa , TOKUZAWA Tokihiko , SAKAKIBARA Satoru , NARUSHIMA Yoshiro , OKAMOTO Masaaki , OHDACHI Satoshi , SUZUKI Yasuhiro , IDA Katsumi

    … <p>In order to clarify the mechanism responsible for slowing down the precursor of an instability in Large Helical Device (LHD), whose behavior is similar to the locked mode instability in tokamaks, the spatial structure of the precursor of the locked-mode-like instability, and the relationship between the rotation of the precursor and the <b>E </b>× <b>B </b>rotation were experimentally investigated. …

    Plasma and Fusion Research 12(0), 1402028-1402028, 2017

    J-STAGE 

  • Secondary instabilities in the collisionless Rayleigh-Taylor instability: Full kinetic simulation

    Umeda Takayuki , Wada Yasutaka

    … The nonlinear evolution of the Rayleigh-Taylor instability (RTI) at a density shear layer transverse to magnetic field in collisionless plasma is investigated by means of a fully kinetic Vlasov simulation with two spatial and two velocity dimensions. … The primary RTI in the MHD regime develops symmetrically in a coordinate axis parallel to gravity as seen in the previous MHD simulations. …

    Physics of Plasmas (23), 112117-112117, 2016-11-18

    IR 

  • MHD Flow Behavior in Non-equilibrium Disk MHD Generator with Swirl Vanes  [in Japanese]

    市ノ木山 大輝 , 藤野 貴康

    電気学会研究会資料. FTE = The papers of Technical Meeting on "Frontier Technology and Engineering", IEE Japan 2016(39-52), 13-18, 2016-11-11

  • Magnetic Field Amplification by the Richtmyer-Meshkov Instability Driven by Shock Waves  [in Japanese]

    SANO Takayoshi

    「磁場」と「乱流混合」が様々なプラズマ現象でホットなキーワードとなっている.ここでは,衝撃波によって励起される界面不安定であるRichtmyer-Meshkov不安定と磁気乱流の関係に着目する.磁化プラズマ中で界面不安定が成長することで,磁力線が引き延され磁場が効率的に増幅される.この特徴について,主に磁気流体シミュレーションを用いた解析結果を簡単に紹介する.

    プラズマ・核融合学会誌 92(2), 83-86, 2016-02

    NDL Digital Collections 

  • Analysis of tearing instability in finite beta plasmas based on extended MHD models  [in Japanese]

    Ito A. , Ramos J.J.

    … <p>有限ベータプラズマにおける巨視的な不安定性であるテアリング不安定性に対して、二流体効果や有限ラーマー半径効果、そして流体モーメントのクロージャに対する非Maxwell成分の効果を導入した拡張MHD方程式から導出した線形固有モード方程式に対する数値解析を行う。 …

    Meeting Abstracts of the Physical Society of Japan 71.2(0), 661-661, 2016

    J-STAGE 

  • Internal structure of locked mode like instability excited in LHD  [in Japanese]

    Takemura Yuki , Watanabe Kiyomasa , Tokihiko Tokuzawa , Sakakibara Satoru , Narushima Yoshiro , Masaaki Okamoto , Tsuchiya Hayato , Yamada Ichihiro

    … <p>LHDの低磁気シア領域では低次MHDモードが成長し、中心電子温度の劣化をもたらす。 …

    Meeting Abstracts of the Physical Society of Japan 71.2(0), 647-647, 2016

    J-STAGE 

  • Non-Ideal Ballooning Mode Instability with Real Electron Inertia

    SETO Haruki , YAGI Masatoshi , AIBA Nobuyuki , MATSUYAMA Akinobu , DUDSON Benjamin D. , XU Xueqiao

    … <p>Impacts of electron inertia with an electron skin depth (ESD) longer than the realistic value used in early numerical studies on non-ideal ballooning modes (NIBMs) are numerically investigated by a linearized 3-field reduced MHD model. …

    Plasma and Fusion Research 11(0), 1203122-1203122, 2016

    J-STAGE 

  • Generation Characteristics of Xenon-Driven High Temperature Inert Gas Plasma Disk-Shaped MHD Generator  [in Japanese]

    Tanaka Manabu , Izumi Yuichiro , Okuno Yoshihiro

    MHD (magnetohydrodynamic) electrical power generation experiments have been conducted with a seed-free high temperature inert gas plasma in a disk-shaped Hall-type generator driven by a single-pulsed shock tunnel. … The unstable and non-uniform plasma attributed to ionization instability is observed at a high magnetic flux density and a high load resistance. …

    IEEJ Transactions on Power and Energy 136(2), 205-210, 2016

    J-STAGE 

Page Top