Search Results 1-20 of 161

  • Vortex crystals on the surface of a torus

    Sakajo Takashi

    This article is part of the theme issue 'Topological and geometrical aspects of mass and vortex dynamics'.

    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377(2158), 2019-09-30

    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 

  • Theoretical Study of Relation between Anomalous Resistivity and Toroidal Spin-Up of Field-Reversed Configurations

    TAKAHASHI Toshiki , URANO Takahiro

    … We propose a hypothesis that an anomalous resistivity produces a difference in the time change rate of the angular momentum of ions and electrons, resulting in the rotation of ions.</p> …

    Plasma and Fusion Research 14(0), 2403037-2403037, 2019

    J-STAGE 

  • High Pressure-type Rotary Blood Pump with a New Principle

    Ariyoshi Koki , Hara Shintaro , Isoyama Takashi , Saito Itsuro , Ono Toshiya , Abe Yusuke

    … To provide a blood pump that can be operated at a lower rotational speed than conventional centrifugal blood pumps, we propose a novel high-pressure type rotary blood pump named the toroidal convolution pump (TCP). … In the TCP, fluid that acquires centrifugal force from rotation of the impeller is returned to the impeller through the flow path and again acquires centrifugal force. …

    Advanced Biomedical Engineering 7(0), 141-145, 2018

    J-STAGE  Ichushi Web 

  • 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

    Canbin Huang , Hanada Kazuaki , Kong Defeng

    Proceedings of International Exchange and Innovation Conference on Engineering & Sciences (IEICES) (3), 73-74, 2017-10-19

    IR  DOI 

  • Toroidal angular momentum balance during rotation changes induced by electron heating modulation in tokamak plasmas

    井戸村 泰宏

    … An electron heating modulation numerical experiment based on a global full-f gyrokinetic model shows that transitions from ion temperature gradient driven (ITG) turbulence to trapped electron mode (TEM) turbulence induced by electron heating generate density peaking and rotation changes. …

    Physics of Plasmas 24(8), 080701\_1-080701\_5, 2017-08

    IR 

  • A study on a swirl flow instability induced by a rotating cylinder between coaxial two disks  [in Japanese]

    KANG Donghyuk , SATO Kotaro , YOKOTA Kazuhiko

    … They were combing and forming one croissant-shaped toroidal vortex (CTV), which was rotating around the cylinder. … The frequencies of vortex rotation agreed in the experiment, the two and three-dimensional simulations. …

    Transactions of the JSME (in Japanese) 83(850), 17-00038-17-00038, 2017

    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 

  • Spectroscopic measurement of impurity ion toroidal rotation in the QUEST with multi-line-of-sight.  [in Japanese]

    Nii Kuniaki , Shikama Taiichi , Fujikawa Akinobu , Hanada Kazuaki , Zushi Hideki , Onchi Takumi , Hasuo Masahiro

    <p>トカマクプラズマ周辺部における水素イオンと原子の相互作用を解明するため,水素イオンと熱平衡状態にあると仮定した不純物イオンのトロイダル回転を計測した.中央平面を14個のリング状の領域に分割し,14本の視線で計測した発光線に逆変換を行うことで,各領域内で一定とした発光強度,温度,トロイダル速度を求めた.プラズマ周辺部の原子圧力の変化によりイオンのトロイダル速度が減少,反転する現象が …

    Meeting Abstracts of the Physical Society of Japan 71.2(0), 690-690, 2016

    J-STAGE 

  • Effects of changes in densities and inertial forces due to toroidal rotation on heat transport in JT-60U  [in Japanese]

    Narita Emi , Honda Mitsuru , Yoshida Maiko , Hayashi Nobuhiko , Urano Hajime , Ide Shunsuke

    <p>JT-60Uにおける標準的なH-mode放電では、トロイダル回転方向はプラズマ周辺部の性能に影響を及ぼすが、中心部の熱輸送は回転方向によらないことが知られている。一方、緩やかな内部輸送障壁を持つ正磁気シアの放電では、回転方向による中心部での熱輸送の変化が報告されている。両放電をジャイロ運動論コードで解析した結果、回転速度とその勾配の関係に両者に相違があるために慣性力の影響が異なる …

    Meeting Abstracts of the Physical Society of Japan 71.2(0), 604-604, 2016

    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 

  • Proposal for the Method of Maintaining Breeder Blankets in the LHD-Type Helical Fusion Reactor FFHR

    GOTO Takuya , MIYAZAWA Junichi , TAMURA Hitoshi , TANAKA Teruya , YANAGI Nagato , SAGARA Akio , the FFHR Design Group

    … A simple segmentation in a plane with a constant toroidal angle was proposed by utilizing the flexible arrangement capacity of the coolant path in the blanket module with a molten salt tritium breeder. … Moreover, it was found that all blanket modules can be extracted by a combination of uniaxial movements and poloidal rotation without cutting of the coolant pipes inside the vacuum vessel.</p> …

    Plasma and Fusion Research 11(0), 2405047-2405047, 2016

    J-STAGE 

  • 19pAD-5 Gyrokinetic analyses of effects of toroidal rotation on heat transport in JT-60U  [in Japanese]

    Narita E. , Honda M. , Yoshida M. , Hayashi N. , Urano H. , Ide S.

    Meeting Abstracts of the Physical Society of Japan 71.1(0), 849, 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 

  • Investigation of Toroidal Acceleration and Potential Acceleration Forces in EAST and J-TEXT Plasmas

    WANG Fudi , WU Bin , CHEN Zhongyong , BITTER Manfred , HILL Kenneth , RICE John , MORITA Shigeru , LI Yadong , ZHUANG Ge , YE Minyou , WAN Baonian , LYU Bo , SHI Yuejiang , EAST Team , PAN Xiayun , CHENG Zhifeng , CHEN Jun , CAO Guangming , WANG Yuming , HAN Xiang , LI Hao

    … <p>Experiments were performed on EAST and J-TEXT for ohmic plasmas with net counter- and co-current toroidal acceleration generated by density ramping-up and ramping-down. … Core toroidal rotation is increasing with <i>T</i><sub>e</sub>/<i>T</i><sub>i</sub> … There may be certain correlation between rotation variation and temporal change in density fluctuation intensity. …

    Plasma and Fusion Research 10(0), 3402069-3402069, 2015

    J-STAGE 

  • Gyrokinetic Analyses of Core Heat Transport in JT-60U Plasmas with Different Toroidal Rotation Direction

    NARITA Emi , HONDA Mitsuru , HAYASHI Nobuhiko , URANO Hajime , IDE Shunsuke , FUKUDA Takeshi

    … In these ITB plasmas, it has been found that the electron temperature ITB is steeper when toroidal rotation is in a co-direction with respect to the plasma current than when toroidal rotation is in a counter-direction. … To clarify the relationship between the direction of toroidal rotation and heat transport in the ITB region, we examine dominant instabilities using the flux-tube gyrokinetic code GS2. …

    Plasma and Fusion Research 10(0), 1403019-1403019, 2015

    J-STAGE 

  • Measurement of Ion Temperature and Flow in RF Start-Up Plasmas in TST-2 and LATE

    TSUDA Shintaro , EJIRI Akira , TANAKA Hitoshi , TAKASE Yuichi , UCHIDA Masaki , MAEKAWA Takashi , TSUJII Naoto , TAKEUCHI Toshihiro

    … and toroidal flow <i>V<sub>φ</sub></i> … The poloidal flow velocities were comparable to the toroidal velocities. …

    Plasma and Fusion Research 10(0), 1202064-1202064, 2015

    J-STAGE 

  • Countercurrent Chromatographic Separation of Proteins Using an Eccentric Coiled Column with Synchronous and Nonsynchronous Type-J Planetary Motions

    SHINOMIYA Kazufusa , YOSHIDA Kazunori , TOKURA Koji , TSUKIDATE Etsuhiro , YANAGIDAIRA Kazuhiro , ITO Yoichiro

    … The partition efficiency was evaluated with two different column configurations, eccentric coil and toroidal coil, on the separation of a set of stable protein samples including cytochrome C, myoglobin and lysozyme with a polymer phase system composed of 12.5% (w/w) polyethylene glycol 1000 and 12.5% (w/w) dibasic potassium phosphate. … Better peak resolution was obtained by the eccentric coil than by the toroidal coil using either lower or upper phase as the mobile phase. …

    Analytical Sciences 31(3), 211-218, 2015

    J-STAGE  Ichushi Web 

  • A new simple model for the solar activity cycle

    YOKOI Nobumitsu

    … The basic scenario for the solar activity cycle in this approach is as follows: The toroidal field is induced by the toroidal rotation in mediation by the turbulent cross helicity. … Then due to the $¥alpha$ or helicity effect, the poloidal field is generated from the toroidal field. … The cross helicity with this opposite sign induces a reversed toroidal field. …

    SEISAN KENKYU 67(1), 17-23, 2015

    J-STAGE 

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