Search Results 1-20 of 308

  • Consideration of the Influence of Coil Misalignment on the Chinese First Quasi-Axisymmetric Stellarator Magnetic Configuration

    SHIMIZU Akihiro , XIONG Guozhen , XU Yuhong , LIU Hai , ZHANG Xin , HUANG Jie , WANG Xianqu , TANG Changjian , YIN Dapeng , WAN Yi , CFQS Team , LIU Haifeng , KINOSHITA Shigeyoshi , ISOBE Mitsutaka , OKAMURA Shoichi , OGAWA Kunihiro , NAKATA Motoki , SATAKE Shinsuke , SUZUKI Chihiro

    … Calculation results show that if the magnitude of displacement is less than 10 mm, the effects on these physical properties are small, and the good neoclassical transport property is retained.</p> …

    Plasma and Fusion Research 14(0), 3403151-3403151, 2019


  • Comparisons of the Plasma Performance of Future Thailand Tokamak using Various External Heating Schemes

    BUARUK Suphachok , MAKMOOL Thanaphan , PROMPING Jiraporn , ONJUN Thawatchai , SANGAROON Siriyaporn , WISITSORASAK Apiwat , GARCIA Jeronimo , CHATTHONG Boonyarit

    … The code consists of a 1D transport solver with general 2D magnetic equilibria, and includes several heat, particle and impurities transport models as well as heat, particle and momentum sources. … In this work, a combination of a mixed Bohm/gyro-Bohm anomalous transport model and an NCLASS neoclassical transport model are used to calculate plasma core diffusivities. …

    Plasma and Fusion Research 14(0), 3403153-3403153, 2019


  • Global Effects on the Variation of Ion Density and Electrostatic Potential on the Flux Surface in Helical Plasmas

    FUJITA Keiji , SATAKE Shinsuke , KANNO Ryutaro , NUNAMI Masanori , NAKATA Motoki , GARCÍA-REGAÑA José Manuel

    … <p>Since the observation of impurity hole in LHD, which contradicts the prediction of the conventional neoclassical transport theory, several attempts have been made to explain the mechanism behind the phenomenon. … Here, a global neoclassical simulation code FORTEC-3D is applied to evaluate Φ<sub>1</sub>, including the global effects, for the first time. …

    Plasma and Fusion Research 14(0), 3403102-3403102, 2019


  • Recent Progress in the Numerical Simulation Reactor Research Project

    SUGAMA Hideo , the Numerical Simulation Reactor Research Project Group

    … In NSRP, eight task groups are organized to cover a wide range of fusion simulation subjects: plasma fluid equilibrium stability, energetic-particle physics, integrated transport simulation, neoclassical and turbulent transport simulation, peripheral plasma transport, plasma-wall interaction, multi-hierarchy physics, and simulation science basis. …

    Plasma and Fusion Research 14(0), 3503059-3503059, 2019


  • Configuration Property of the Chinese First Quasi-Axisymmetric Stellarator

    SHIMIZU Akihiro , HUANG Jie , WANG Xiangqu , LIU Hai , TANG Changjian , CFQS team , LIU Haifeng , ISOBE Mitsutaka , OKAMURA Shoichi , NISHIMURA Shin , SUZUKI Chihiro , XU Yuhong , ZHANG Xin , LIU Bing

    … Next, the effects of the bootstrap current on the quasi-axisymmetric property and the neoclassical diffusion coefficient were estimated. … The bootstrap current little affected the quasi-axisymmetric property, and a good neoclassical transport property was maintained.</p> …

    Plasma and Fusion Research 13(0), 3403123-3403123, 2018


  • Plasma Scenario Study for HT-6M Tokamak Using BALDUR Integrated Predictive Modeling Code

    PROMPING Jiraporn , SANGAROON Siriyaporn , WISITSORASAK Apiwat , CHATTHONG Boonyarit , PICHA Roppon , ONJUN Thawatchai

    … In these simulations, a combination of turbulence and neoclassical transports is used for predicting thermal and particle transport. …

    Plasma and Fusion Research 13(0), 3403094-3403094, 2018


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

    井戸村 泰宏

    … Toroidal angular momentum balance during the rotation changes is revealed by direct observation of toroidal angular momentum conservation, in which in addition to ion turbulent stress, ion neoclassical stress, radial currents, and toroidal field stress of ions and electrons are important. … Toroidal torque flipping between ITG and TEM phases is found to be related to reversal of the ion radial current that indicates coupling of particle and momentum transport channels. …

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


  • Study on the effect of bootstrap current on the MHD equilibrium and neoclassical transport in FFHR-d1  [in Japanese]

    Satake S. , Huang B. , Goto T. , Suzuki Y. , Kanno R.

    <p>ヘリカル型核融合炉FFHR-d1のデザインにおいて、これまであまり考慮されていなかったブートストラップ電流によるMHD平衡への影響や、ブートストラップ電流込みの平衡磁場中での新古典径方向粒子・熱輸送の評価を数値シミュレーションする。この際、MHD平衡計算とブートストラップ電流の計算を繰り返して自己無矛盾な平衡解を探す。ブートストラップ電流のプラズマベータ値や衝突周波数依存性につい …

    Meeting Abstracts of the Physical Society of Japan 72.1(0), 820-820, 2017


  • Neoclassical transport characteristics and particle transport modeling in TASK/TX  [in Japanese]

    Honda Mitsuru , Fukuyama Atsushi , Nakata Motoki

    <p>軸対称磁気座標系における流体型輸送コードTASK/TXはモーメント法に基づく新古典輸送を自前で計算出来るため、外部の新古典輸送コードを必要としない。新古典諸量をMatrix InversionやNCLASSの結果と比較し妥当性を検証するとともに、遷移的な状況でのTASK/TXの優位性を示す。ビーム入射時における新古典諸量の変化についても言及する。更に、乱流粒子束のモデリングと計算 …

    Meeting Abstracts of the Physical Society of Japan 72.1(0), 821-821, 2017


  • Impacts of External Momentum Torque on Impurity Particle Transport in LHD

    NUNAMI Masanori , SATO Masahiko , NAKATA Motoki , TODA Shinichiro , SUGAMA Hideo , YOKOYAMA Masayuki , YAMAGUCHI Hiroyuki

    … <p>Particle transport processes of impurity ions in a multi-ion-species plasma in the Large Helical Device are investigated by neoclassical transport simulations. …

    Plasma and Fusion Research 12(0), 1203039-1203039, 2017


  • Implementation of Neoclassical Effects in Momentum Transport Analysis at LHD

    BECKERS Jasper , IDA Katsumi , YOSHINUMA Mikirou , EMOTO Masahiko , SEKI Ryosuke , YOKOYAMA Masayuki , JASPERS Roger

    … At NIFS plasma rotation and momentum transport of the Large Helical Device (LHD) plasma is analysed using a code suite called TASK3D-a. … In this work neoclassical effects, which can be especially significant in non-axisymmetric plasmas, were implemented in TASK3D-a. …

    Plasma and Fusion Research 12(0), 1402006-1402006, 2017


  • Benchmark of the Bootstrap Current Simulation in Helical Plasmas

    HUANG Botsz , SATAKE Shinsuke , KANNO Ryutaro , SUGAMA Hideo , GOTO Takuya

    <p>The importance of the parallel momentum balance on the bootstrap current evaluation in non-axisymmetric systems is demonstrated by the benchmarks among the local drift-kinetic equation solver …

    Plasma and Fusion Research 12(0), 1203004-1203004, 2017


  • Transport Simulation of Core Plasmas  [in Japanese]

    菅野 龍太郎 , 佐竹 真介 , 沼波 政倫 , 仲田 資季 , 登田 慎一郎 , 山岸 統 , 洲鎌 英雄 , 渡邉 智彦 , 石澤 明宏

    プラズマ・核融合学会誌 = Journal of plasma and fusion research 92(11), 794-805, 2016-11

  • Saturation Mechanism of Decaying Ion Temperature Gradient Driven Turbulence with Kinetic Electrons

    IDOMURA Yasuhiro

    … It is found that significant electron transport occurs even in the ITG turbulence, and both ion and electron temperature profiles are relaxed. … On the other hand, in the kinetic electron case, passing electrons transport shows fine resonant structures at mode rational surfaces, which generate corrugated density profiles. … Such corrugated density profiles lead to fine radial electric fields following the neoclassical force balance relation. …

    Plasma and Fusion Research 11(0), 2403006-2403006, 2016

    IR  J-STAGE 

  • Estimations of Beam-Beam Fusion Reaction Rates in the Deuterium Plasma Experiment on LHD

    HOMMA Masayuki , MURAKAMI Sadayoshi , NUGA Hideo , YAMAGUCHI Hiroyuki

    … <p>Beam-beam nuclear fusion reactions in the Large Helical Device (LHD) deuterium plasma are investigated by the Global NEoclassical Transport (GNET) code, which can solve the five-dimensional drift kinetic equation using Monte Carlo methods. …

    Plasma and Fusion Research 11(0), 2403109-2403109, 2016


  • Simulation Study of Energetic Triton Confinement in the D-D Experiment on LHD

    HOMMA Masayuki , MURAKAMI Sadayoshi , ISOBE Mitsutaka , TOMITA Hideki , OGAWA Kunihiro

    … The confinement of energetic tritons is investigated by the Global NEoclassical Transport (GNET) code, which can solve the five-dimensional drift kinetic equation using Monte Carlo methods. …

    Plasma and Fusion Research 10(0), 3403050-3403050, 2015


  • Simulation on Sawtooth Period Control in Tokamak Plasma

    NATSUME Hiroki , FUJITA Takaaki , ARIMOTO Hideki , YAMAZAKI Kozo

    … <p>The sawtooth period control is important in inductive operation of tokamak plasma because the sawteeth with long periods trigger the neoclassical tearing modes (NTMs) which reduce the plasma confinement capability significantly. … We studied the effect of the sawtooth period control by the electron cyclotron current drive (ECCD) in ITER using the 1.5-dimensional transport code TOTAL. …

    Plasma and Fusion Research 10(0), 3403051-3403051, 2015


  • Analysis of Tungsten Transport in JT-60U Plasmas

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

    … We introduce them to the integrated transport code TOTAL. … The tungsten accumulation in the PHZ pinch model was 1.4 - 2.2 times higher than predicted by neoclassical transport only.</p> …

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


  • Nonlinear Stability of Externally Induced Magnetic Islands in Multi-Helicity Helical Systems


    … <p>Self-healing (spontaneous shrinkage) of externally induced magnetic islands is a critical issue in helical systems, where helical ripple-induced neoclassical viscous torques play essential roles. … It is newly found that self-healing thresholds considerably depend on magnetic axis positions, which is due to neoclassical viscous torques depending on effective helical ripple rates.</p> …

    Plasma and Fusion Research 10(0), 1203014-1203014, 2015


  • Formulation of Two-Dimensional Transport Modeling in Tokamak Plasmas

    SETO Haruki , FUKUYAMA Atsushi

    … A two-dimensional transport modeling applicable to a whole tokamak plasma is proposed. … The model is derived from the multi-fluid equations and Maxwell's equations and the moment approach of neoclassical transport is employed as fluid closures. … The multi-fluid equations consist of the equations for particle density, momentum, energy and total heat flux transport for each plasma species. …

    Plasma and Fusion Research (9), 2014-01-31


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