Nonlinear Simulation of Collapse Phenomenon in Helical Plasma with a Large Pressure Gradient
スポンサーリンク
概要
- 論文の詳細を見る
Nonlinear magnetohydrodynamics (MHD) simulations are conducted for a helical plasma with a large pressure gradient to investigate the collapse event induced by MHD instabilities. The simulation results show that the ballooning-like instabilities on an intermediate spatial scale induce disordering of structures in the barrier region and a drop in the central pressure. It was revealed that the core pressure fall is related to disordering of the magnetic field structure. The simulation results are compared qualitatively with the experimental observations of the collapse events in the superdense core state of the Large Helical Device (LHD). Compared with our previous simulation studies of similar situations in the spherical tokamak (ST) plasma, the results for the helical cases show milder collapses than those in the ST case.
著者
-
OHYABU Nobuyoshi
National Insitute for Fusion Science
-
Suzuki Yasuhiro
National Agriculture And Food Res. Organization (naro) National Inst. Of Crop Sci.
-
MIZUGUCHI Naoki
National Institute for Fusion Science
-
OHYABU Nobuyoshi
National Institute for Fusion Science, Toki 509-5292, Japan
関連論文
- Theoretical Modeling of Transport Barriers in Helical Plasmas
- Abrupt Flushing of High-Density Core in Internal Diffusion Barrier Plasmas and its Suppression by Plasma Shape Control in LHD
- Stability and Confinement Studies of High-Performance NBI Plasmas in the Large Helical Device Toward a Steady-State Helical Fusion Reactor
- Achievement of 10 keV Central Electron Temperatures by ECH in LHD
- Effect of Rotational Transform and Magnetic Shear on Confinement of Stellarators
- Retention and Desorption of Hydrogen and Helium in Inner Wall Material Used for The Large Helical Device (LHD) : Simulation experiments using a glow discharge apparatus
- Prevention of Reversed Flow in Gas Divertor with High Vacuum Chamber
- Local Impurity Deposition in a Magnetic Island by Means of a Tracer-Encapsulated Solid Pellet in the LHD
- Analysis of Radial Electric Field Bifurcation in LHD Based on Neoclassical Transport Theory
- シート・プラズマ中のヘリウムイオン温度
- LHDダイバータ模擬実験のための高熱流シートプラズマ開発研究
- Extension of Improved Particle and Energy Confinement Regime in the Core of LHD Plasma
- Identification of gene for rice (Oryza sativa) seed lipoxygenase-3 involved in the generation of stale flavor and development of SNP markers for lipoxygenase-3 deficiency
- Monte Carlo Study Based on a Real Coordinate System for Tangentially Injected High-Energy Particles in the Large Helical Device
- Analysis of Expression of Genes for Mitochondrial Aldehyde Dehydrogenase in Maize during Submergence and Following Re-aeration
- A rice mutant with enhanced amylose content in endosperm without affecting amylopectin structure
- Electron Confining Potential When the Electrons Have Finite Axial Loss Time
- Neutron and Fast Atom Spectrometry Using Natural Diamond Detectors
- Impurity Retention Effect in the Edge Ergodic Layer of the Large Helical Device
- Potential Formation in a High-Temperature Divertor Plasma
- A New Boundary Control Scheme for Simultaneous Achievement of H-Mode and Radiative Cooling (SHC Boundary)
- Plasma Plugging in Gas Divertor
- Magnetic reconnection and relaxation phenomena in Spherical Tokamak
- Evaluation of a Quantitative Method for Trace Impurities in Arsenous Acids by Synchrotron Radiation X-ray Fluorescence Spectrometry and Inductively Coupled Plasma-Atomic Emission Spectrometry
- Molecular Characterization of Wx-mq, a Novel Mutant Gene for Low-amylose Content in Endosperm of Rice (Oryza sativa L.)
- Physics of Heliotron J Confinement
- Density Collapse and Fluctuation Observed in Poloidally Rotating Plasma on TU-Heliac
- Effects of Rotating Magnetic Islands Driven by External Perturbation Fields in the TU-Heliac
- Effects of Magnetic Islands Produced by External Perturbation Fields in the Tohoku University Heliac
- Numerical Diagnostics of the Electrostatic Potential Perturbed by Magnetic Islands
- Forensic Discrimination of Sheet Glass by a Refractive-Index Measurement and Elemental Analysis with Synchrotron Radiation X-ray Fluorescence Spectrometry
- Nondestructive Analysis of Silver in Gold Foil Using Synchrotron Radiation X-ray Fluorescence Spectrometry
- Monte-Carlo Simulation of Neoclassical Transport in Magnetic Islands and Ergodic Regions
- Simulation Data Analysis by Virtual Reality System
- Effect of Toroidal Current on Rotational Transform Profile by MHD Activity Measurement in Heliotron J
- Forensic Discrimination of Sheet Glass Exposed to High Temperature by the Determination of Trace Impurities Using ICP-MS
- Nonlinear Simulation of Edge-Localized Mode in Spherical Tokamak
- Forensic Discrimination of Bottle Glass by Refractive Index Measurement and Analysis of Trace Elements with ICP-MS
- Forensic Discrimination of Lead-Tin Solder Based on the Trace Impurity Analysis by ICP-AES
- High Temperature Divertor Plasma Operation
- Particle Orbit Analysis in the Finite Beta Plasma of the Large Helical Device using Real Coordinates
- Determination of Trace Impurities in Lead Shotgun Pellets by ICP-MS
- Effects of the Stochasticity on Transport Properties in High-β LHD
- Monte-Carlo Study Based on Real Coordinates for Perpendicularly Injected High-Energy Ions in the LHD High-Beta Plasma
- Design Support System with Haptic Feedback and Real-Time Interference Function
- The Amylose Content and Amylopectin Structure Affect the Shape and Hardness of Rice Bread
- Advanced Probe Measurement System in TU-Heliac
- Genetic analysis of the low-amylose characteristics of rice cultivars Oborozuki and Hokkai-PL9
- High-Density, Low Temperature Ignited Operations in FFHR
- Transport Study of LHD High-Beta Plasmas Based on Power Balance Analysis with TASK3D Code Module
- Effects of Water Soaking on Bread-Making Quality of Brown Rice Flour
- Effects of Magnetic Islands on Poloidal Flow in TU-Heliac
- Nonlinear Simulation of Collapse Phenomenon in Helical Plasma with a Large Pressure Gradient
- Density Regimes of Complete Detachment and Serpens Mode in LHD
- A New Explanation for Toroidal Spin-Up of a Field-Reversed Configuration
- Investigation of Carbon Films on Material Probes in the Vicinity of Local Island Divertor in the Large Helical Device
- New Control Method of the Unstable Operating Point in the FFHR Helical Reactor
- Pellet Injection and Internal Diffusion Barrier Formation in Large Helical Device
- Characteristics of Radiating Collapse at the Density Limit in the Large Helical Device
- Heat- and Particle-Deposition Distribution on Helical Divertor Plates in LHD During Real-Time Magnetic-Axis Swing Operations
- New Calibration Method of Magnetic Measurements Based on the MHD Equilibrium with the Ergodic Region
- LHD Bootstrap Current Coefficient Calculations with the VENUS+δ f code
- Microwave Imaging Reflectometry Experiment in TPE-RX
- Study of Magnetic Island Using a 3D MHD Equilibrium Calculation Code
- Performance Improvement in Real-Time Mapping of Thomson Scattering Data to Flux Coordinates in LHD
- Neoclassical Transport Properties in High-Ion-Temperature Hydrogen Plasmas in the Large Helical Device (LHD)
- Comparative Study of Magnetic Field Configurations of LHD and CHS based on the Boundary Shape Analysis