A5057564025- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Ion-surface interactions and analysis
- Nuclear and radioactivity studies
- Catalytic Processes in Materials Science
- Industrial Gas Emission Control
- Groundwater flow and contamination studies
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Electrohydrodynamics and Fluid Dynamics
- Characterization and Applications of Magnetic Nanoparticles
- Advanced oxidation water treatment
- Tribology and Lubrication Engineering
- Fusion materials and technologies
- Plasma Applications and Diagnostics
- Magnetic properties of thin films
- Theoretical and Computational Physics
- Geomagnetism and Paleomagnetism Studies
- Gas Sensing Nanomaterials and Sensors
- Geotechnical and Geomechanical Engineering
- Slime Mold and Myxomycetes Research
- Electrostatic Discharge in Electronics
Japan Coast Guard Academy
2002-2022
Himeji University
1993-2004
University of Hyogo
2004
Osaka University
1999-2001
In the Helicity Injected Spherical Torus device [Nagata et al., Proceedings of 17th International Atomic Energy Agency Fusion Conference, Yokohama, 1998 (International Agency, Vienna, 1998) CD-ROM, EXP4/10], internal magnetic field and current density structures spherical torus (ST) plasmas sustained by coaxial helicity injection (CHI) have been revealed via intensive measurements. The configuration ST plasma formed CHI is in good agreement with results numerical equilibrium fitting...
During the sustained phase of spheromak operation in flux amplification compact toroid device, detailed observations were made on discrete relaxation and toroidal current regeneration events that occurred throughout a typical quasiregular cycle. Measurements indicate over such cycle there appears to be global self-organizing phenomenon which involves both collapse subsequent recovery closed surfaces. At point recovery, partially relaxed state is characterized by value \ensuremath{\lambda}...
Experiments on additional heating by neutral beam injection and application of a low frequency wave to plasma with an extremely high averaged beta value about 90% - field reversed configuration (FRC) are carried out using the FRC Injection Experiment (FIX) apparatus. These experiments made possible translating produced in formation region theta pinch confinement order secure better accessibility facilities control density. By determining appropriate geometry mirror ratio region, it became...
Abstract Reaction byproducts from degradation of aqueous phenol by contact gas d.c. corona discharge with treated water were analyzed liquid chromatography. According to the retention time, three byproducts, pyrocatechol, hydroquinone, 1,4‐benzoquinone, identified. Also, acetic acid was detected as a final relatively stable byproduct A simple reaction model in which relevant elementary reactions are assumed be first order proposed correlate practical behavior processes.
A two-dimensional magnetohydrodynamic (MHD) simulation of an axial magnetic compression on a field-reversed configuration (FRC) plasma is carried out for the parameter range corresponding experiment conducted FRC Injection Experiment (FIX) [S. Okada et al., 17th IAEA Fusion Energy Conference 1998 (International Atomic Agency, Vienna) (in press)]. The results show that during initial stage front part mainly compressed radially, and after this stage, primarily axial. Of particular interest...
A novel remote dry processing of specific reactive negative ions with a deflection and focusing system is being developed to precisely control their energy, flux reaching position on the nanoscale. The trajectory simulations ion extraction transport for design this apparatus have been carried out using SIMION software. It found from simulation results that beams good characteristics, high directivity appropriate current amount can be successfully extracted plasma source transported reactor...
Abstract A new remote dry processing with a focusing and deflection system is proposed to accurately control the energy, flux, arrival position of reactive particle species on nanoscale. The trajectory simulations negative ion extraction transport for designing compact separator based concept are performed using SIMION software. In separator, beam extracted from plasma source can be deflected in two stages through pairs magnets by selecting only specific ions so that it laterally drawn out....
Two-fluid flowing equilibrium configurations of a helicity-driven spherical torus (HD-ST) in the realistic confinement region, including flux conserver and coaxial helicity source, are numerically determined by means combination finite difference boundary element methods. It is found from numerical results that electron fluid near central conductor tied to vacuum toroidal field ion not. The magnetic change high-q HD-ST (safety factor, q>1) with paramagnetic low-β (volume average β...
A two-fluid flowing equilibrium of a helicity-injected spherical torus (HI-ST) plasma in the more realistic region, including flux conserver and coaxial helicity source, is numerically determined by using combination finite difference boundary element methods. It found from numerical results that magnetic configurations change high-q HI-ST (safety factor q>1) with paramagnetic toroidal field low-beta (volume average beta value, langbetarangap2%) through spheromak reversed-field pinch to...
In the flux amplification compact torus experiment, bias penetrates wall of conserver because it has been switched on a suitably long time prior to production seed spheromak. The magnetohydrodynamic equilibrium configurations with non-constant λ(≡µ 0 j · B / | 2 ) profile helicity-driven spheromak incorporating situation bias-flux leakage out are numerically determined by using novel combination finite difference and boundary element method. Here µ , permeability vacuum, current density...
Abstract A cylindrical wetted‐wall corona discharge reactor was used for the removal of acetaldehyde in gas mixtures N 2 and O . Gaseous removed from stream by simultaneous absorption gaseous reaction. The absorbed water, decomposed aqueous radical, OH, produced contact with water film. There is an optimized oxygen concentration effective removal. When coexists mixture at 5 %, effectively removed, resulting overall sustainable acetaldehyde. However, increase resulted a decrease extent...
Abstract A DC corona discharge reactor was applied to remove sulfur dioxide (SO 2 ) and benzene (C 6 H from N ‐O ‐H O mixed gas in the temperature range room 400 °C. When SO removed, elevation caused decrease of removal efficiency . On other hand, C not significantly influenced by elevation. In simultaneous relatively low below 200 °C, is inhibited coexisting conducted high range, sensitive against almost independent at all temperatures. hypothesis reaction mechanism discussed based on...
Kink instability and the subsequent plasma flow during sustainment of a coaxial gun spheromak are investigated by three-dimensional nonlinear magnetohydrodynamic simulations. Analysis parallel current density λ profile in central open column revealed that n = 1 mode structure plays an important role relaxation drive. The toroidal (vt ≈ 37 km/s) is driven magnetic reconnection occurring as result helical kink distortion repetitive plasmoid ejection merging.
A two-dimensional magnetohydrodynamic (MHD) simulation of the reflection dynamics a field-reversed configuration (FRC) plasma is performed by numerically modeling confinement region FRC Injection Experiment [H. Himura et al., Phys. Plasmas. 2, 191 (1995)] machine. The reflected downstream magnetic mirror field at end without severe destruction closed flux surfaces even when injected supersonic velocity into region, showing robustness against external perturbations. By examining details...
Two-fluid (ions and electrons) flowing equilibrium configurations of spherical torus plasma are numerically determined by using the multi-grid method. The axisymmetric equations consist a pair second-order partial differential for magnetic (electron) ion stream f unctions, Bernoulli density. It is found from numerical results that method with damped Jacobi in smoothing step effective solving these stability, high accuracy, speed.
A reactor using d.c. corona discharge of negative polarity was applied to remove sulfur dioxide from an oxygen-nitrogen mixture in the presence or absence water vapor for temperatures ranging room temperature 350 °C. It observed that increasing caused a decrease removal efficiency. Mixing with process gas resulted increase The effect on improving efficiency significant under low conditions, while it relatively moderate high conditions. In addition, solid deposit formed inside at two...