Search Results 1-20 of 42

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  • Transition of flow field of acoustically levitated droplets with evaporation

    金子 暁子 , 阿部 豊 , Y. Sasaki , K. Kobayashi , K. Hasegawa , Akiko KANEKO , Yutaka ABE

    … We investigated the multidimensional velocity field of acoustically levitated droplets using stereoscopic particle image velocimetry. … Immediately following droplet levitation, toroidal vortices were generated in the droplet; … To investigate the driving force of the uniaxial rotation of the levitated droplet, we simulated the internal flow of the rotating droplet. …

    Physics of fluids 31(10), 102109, 2019-10

    IR 

  • Estimation of the <i>j </i>× <i>B </i>Force Produced by Electron Cyclotron Heating in HSX Plasma

    YAMAMOTO Yasuhiro , MURAKAMI Sadayoshi , CHANG Ching-Chieh , KUMAR Santhosh T.A. , TALMADGE Joseph N. , LIKIN Konstantin , ANDERSON David T.

    … Radial diffusion of energetic electrons by ECH produces a canceling return current, which then generates a <i>j </i>× <i>B </i>force that can play an important role in the toroidal rotation during ECH in HSX plasma. … We evaluate the <i>j </i>× <i>B </i>force and the collisional force due to the friction of the toroidal drift motion of the energetic electrons. …

    Plasma and Fusion Research 14(0), 3403105-3403105, 2019

    J-STAGE 

  • Poloidal Flow Velocity Measurement in High-Density NBI Plasmas of Heliotron J

    LU Xiangxun , MINAMI Takashi , OHSHIMA Shinsuke , YAMAMOTO Satoshi , YONEMURA Yuma , HAJI Naoyuki , WATANABE Shintaro , OKAZAKI Hisashi , KANAZAWA Tomomi , ADULSIRISWAD Panith , ISHIZAWA Akihiro , KOBAYASHI Shinji , NAKAMURA Yuji , KONOSHIMA Shigeru , MIZUUCHI Tohru , TANOHIRA Shun , IDA Katsumi , NISHIMURA Shin , NARUSHIMA Yoshiro , NAGASAKI Kazunobu , KADO Shinichiro , OKADA Hiroyuki

    … The evaluation of radial electric field based on the experimental results of toroidal and poloidal rotation velocities shows the formation of a large <i>E<sub>r</sub></i> …

    Plasma and Fusion Research 13(0), 1202077-1202077, 2018

    J-STAGE 

  • Observation of ELM mitigation by counter current direction NBI on EAST  [in Japanese]

    Huang Canbin , Kong Defeng , Lu Bo , Wang Liang

    … Statistics results show the ELM size decreases with increasing toroidal rotation velocity in counter current direction, and decreases with increasing density, which is consistent with previous BOUT++ simulation results. … Density and impurity accumulation was seen in less amplitude and frequency ELMs with lower toroidal rotation velocity. …

    Meeting Abstracts of the Physical Society of Japan 72.1(0), 372-372, 2017

    J-STAGE 

  • Particle Pinch Model of Passing/Trapped High-Z Impurity with Centrifugal Force Effect

    SHIMIZU Yusuke , FUJITA Takaaki , OKAMOTO Atsushi , ARIMOTO Hideki , HAYASHI Nobuhiko , HOSHINO Kazuo , NAKANO Tomohide , HONDA Mitsuru

    … It is found that the PHZ pinch is large for the barely trapped particles and the pinch velocity increases with the rotation velocity as in the original model.</p> …

    Plasma and Fusion Research 11(0), 2403082-2403082, 2016

    J-STAGE 

  • Analysis of Tungsten Transport in JT-60U Plasmas

    SHIMIZU Yusuke , FUJITA Takaaki , ARIMOTO Hideki , NAKANO Tomohide , HOSHINO Kazuo , HAYASHI Nobuhiko

    … <p>In JT-60U plasmas, increasing the toroidal rotation opposite to the plasma current (CTR rotation) enhances tungsten accumulation. … </i>have proposed two pinch models (i.e., PHZ pinch and Er pinch), which account for the effects of toroidal rotation and the radial electric field, respectively. …

    Plasma and Fusion Research 10(0), 3403062-3403062, 2015

    J-STAGE 

  • Two Point Correlation Technique for the Measurements of Poloidal Plasma Rotation by Heavy Ion Beam Probe

    ELISEEV Leonid , MELNIKOV Alexer , PERFILOV Stanislav , HIDALGO Carlos

    … The paper proposes a method to measure poloidal rotation velocity of toroidal plasma <i>v</i><sub>pol</sub> … and velocity of <i>E</i> … drift (<i>v</i><sub>E×B</sub>) at the same time as plasma rotation. … Experimental data shows that in low density ECRH plasma the rotation velocity coincides with <i>E</i> …

    Plasma and Fusion Research 7(0), 2402064-2402064, 2012

    J-STAGE 

  • Measurement of Ion Temperature and Toroidal Rotation Velocity Using Charge Exchange Recombination Spectroscopy in Heliotron J

    LEE Hyunyong , MURAKAMI Sadayoshi , NAKAMURA Yuji , HANATANI Kiyoshi , KONOSHIMA Shigeru , OHSHIMA Shinsuke , MUKAI Kiyofumi , KAGAWA Tasuku , SANO Fumimichi , KOBAYASHI Shinji , MINAMI Takayuki , KADO Shinichiro , MIZUUCHI Tohru , NAGASAKI Kazunobu , OKADA Hiroyuki , MINAMI Takashi , YAMAMOTO Satoshi

    … We applied this system is applied to an NBI plasma and the time evolution of the ion temperature and the toroidal rotation velocity profile are successfully obtained. …

    Plasma and Fusion Research 7(0), 1402019-1402019, 2012

    J-STAGE 

  • Quasisymmetric toroidal plasmas with large mean flows

    H. Sugama , T.-H. Watanabe , M. Nunami , S. Nishimura

    … Geometric conditions for quasisymmetric toroidal plasmas with large mean flows on the order of the ion thermal speed are investigated. …

    Physics of Plasmas Vol.18(Issue 8), 82505, 2011-01-01

    IR 

  • Development of Advanced Tokamak Operation Scenarios in JT-60U and JT-60SA

    SUZUKI Takahiro , the JT-60 Team

    … was limited by the appearance of the Resistive Wall Mode (RWM) when the toroidal rotation velocity at the q = 3 surface decreased to below the critical velocity. …

    Plasma and Fusion Research (5), S2008-S2008, 2010

    J-STAGE 

  • Stability and Confinement Studies of High-Performance NBI Plasmas in the Large Helical Device Toward a Steady-State Helical Fusion Reactor

    Yasuhiko TAKEIRI , Akio KOMORI , Hiroshi YAMADA , Kazuo KAWAHATA , Takashi MUTOH , Nobuyoshi OHYABU , Osamu KANEKO , Sinsaku IMAGAWA , Yoshio NAGAYAMA , Kiyomasa WATANABE , Takashi SHIMOZUMA , Katsumi IDA , Ryuichi SAKAMOTO , Masahiro KOBAYASHI , Akio SAGARA , Kenichi NAGAOKA , Mikiro YOSHINUMA , Satoru SAKAKIBARA , Yasuhiro SUZUKI , Masayuki YOKOYAMA , Shigeru SUDO , Osamu MOTOJIMA , LHD Experimental Group the

    … Transport analysis shows improvement of ion transport, and the Ti-increase tends to be accompanied by a large toroidal rotation velocity of the order of 50 km/s in the core region. …

    Plasma and Fusion Research (Vol.3), S1001-1 -S1001-8, 2008-01-01

    IR 

  • Improvement of Ion Confinement in Core Electron-Root Confinement (CERC) Plasmas in Large Helical Device

    Yasuhiko TAKEIRI , Masayuki YOKOYAMA , Kenichi NAGAOKA , Katsumi IDA , Shin KUBO , Takashi SHIMOZUMA , Hisamichi FUNABA , Masaki OSAKABE , Katsunori IKEDA , Katsuyoshi TSUMORI , Yashihide OKA , Mikiro YOSHINUMA , Shigeru MORITA , Motoshi GOTO , Kazumichi NARIHARA , Ichihiro YAMADA , Kenji TANAKA , Osamu KANEKO , Akio KOMORI , Experimental Group LHD

    Toroidal rotation is driven in the co-direction by applying ECRH, and the toroidal rotation velocity is increased with the Ti rise. … A correlation between the Ti rise and toroidal rotation is suggested. …

    Plasma and Fusion Research (Vol.3), S1031-1 - S1031-5, 2008-01-01

    IR 

  • Improvement of Ion Confinement in Core Electron-Root Confinement (CERC) Plasmas in Large Helical Device

    TAKEIRI Yasuhiko , TSUMORI Katsuyoshi , OKA Yashihide , YOSHINUMA Mikiro , MORITA Shigeru , GOTO Motoshi , NARIHARA Kazumichi , YAMADA Ichihiro , TANAKA Kenji , KANEKO Osamu , KOMORI Akio , YOKOYAMA Masayuki , LHD Experimental Group , NAGAOKA Kenichi , IDA Katsumi , KUBO Shin , SHIMOZUMA Takashi , FUNABA Hisamichi , OSAKABE Masaki , IKEDA Katsunori

    Toroidal rotation is driven in the co-direction by applying ECRH, and the toroidal rotation velocity is increased with the T<sub>i</sub> … rise and toroidal rotation is suggested. …

    Plasma and Fusion Research (3), S1031-S1031, 2008

    J-STAGE 

  • Plasma Rotation Measurements by Passive Spectroscopic Method in the HYBTOK-II using a Dynamic Ergodic Divertor

    HASEBE Yu , OKAMOTO Masaaki , KAJITA Shin , OHNO Noriyasu , TAKAMURA Shuichi

    … Plasma rotation or its shear is important in the formation of a transport barrier. … It is believed that a rotating helical magnetic field generated by a dynamic ergodic divertor (DED) can generate a rotational torque in tokamak plasmas, and therefore control the rotation profiles. …

    Plasma and Fusion Research (3), S1015-S1015, 2008

    J-STAGE 

  • Physics Mechanisms of Toroidal Rotation Profile and Properties of Momentum Transport in JT-60U

    YOSHIDA Maiko , KAMADA Yutaka , TAKENAGA Hidenobu , SAKAMOTO Yoshiteru , URANO Hajime , OYAMA Naoyuki , MATSUNAGA Go , the JT-60 Team

    … The roles of momentum transport on the toroidal rotation velocity (V<sub>t</sub>) profile and the properties of transport coefficients are found by transient momentum transport analysis. … The perturbation technique enables us to evaluate the momentum diffusivity (χ<sub>φ</sub>) and the convection velocity (V<sub>conv</sub>), and to calculate V<sub>t</sub> …

    Plasma and Fusion Research (3), S1007-S1007, 2008

    J-STAGE 

  • Stability and Confinement Studies of High-Performance NBI Plasmas in the Large Helical Device Toward a Steady-State Helical Fusion Reactor

    TAKEIRI Yasuhiko , WATANABE Kiyomasa , SHIMOZUMA Takashi , IDA Katsumi , SAKAMOTO Ryuichi , KOBAYASHI Masahiro , SAGARA Akio , NAGAOKA Kenichi , YOSHINUMA Mikiro , SAKAKIBARA Satoru , SUZUKI Yasuhiro , KOMORI Akio , YOKOYAMA Masayuki , SUDO Shigeru , MOTOJIMA Osamu , the LHD Experimental Group , YAMADA Hiroshi , KAWAHATA Kazuo , MUTOH Takashi , OHYABU Nobuyoshi , KANEKO Osamu , IMAGAWA Sinsaku , NAGAYAMA Yoshio

    … Transport analysis shows improvement of ion transport, and the T<sub>i</sub>-increase tends to be accompanied by a large toroidal rotation velocity of the order of 50 km/s in the core region. …

    Plasma and Fusion Research 3(0), S1001-S1001, 2008

    J-STAGE 

  • 2P1-A21 Fundamental Study of a Continuously Variable Transmission Using Quadric Crank Chains  [in Japanese]

    YUKAWA Toshihiro

    … As for rotation power generated by engine power in the vehicle, the transmission is a mechanism to adjust power/torque transmitted to the wheel, and the rotation speed of the wheel. … CVTs include belt type CVT and toroidal CVT. … For the toroidal CVT, two rollers are being pushed by strong compression power. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2008(0), _2P1-A21_1-_2P1-A21_2, 2008

    J-STAGE 

  • Fast Ion Dynamics in Magnetically Confined Plasma Measured by Collective Thomson Scattering

    BINDSLEV Henrik , HOEKZEMA J. A. , OOSTERBEEK J. W. , PORTE Laurie , the TEXTOR team , NIELSEN Stefan K. , KORSHOLM Søren B. , MEO Fernando , MICHELSEN Poul K. , MICHELSEN Susanne , TSAKADZE Erekle L. , WOSKOV Paul , WESTERHOF Egbert

    … Here we present CTS measurements of the TEXTOR tokamak plasma which show fast ions responding to sawteeth and display slowdown evolution of the fast ion velocity distribution after switch off of neutral beam heating. … The toroidal rotation velocity of the bulk ions is inferred from the measurements. …

    Plasma and Fusion Research (2), S1023-S1023, 2007

    J-STAGE 

  • Self-Similar Solutions for ADAF with Toroidal Magnetic Fields

    AKIZUKI Chizuru , FUKUE Jun

    … We examined the effect of toroidal magnetic fields on a viscous gaseous disk around a central object under an advection-dominated stage. … We found self-similar solutions for the radial infall velocity, rotation velocity, and sound speed, with an additional parameter, Beta [= c^2_A/(2c^2_S)], where C_A is the Alfven speed and C_s is the isothermal sound speed. …

    Publications of the Astronomical Society of Japan 58(2), 469-475, 2006-04-25

    IR  References (36) Cited by (1)

  • 01pA19P Influence of anisotropic loss of alpha particles in velocity space on toroidal plasma rotation in a fusion reactor  [in Japanese]

    Kobayashi Yuki , Saigusa Mikio , Hamamatsu Kiyotaka

    プラズマ・核融合学会年会予稿集 (22), 175, 2005

    NDL Digital Collections 

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