A5031325546- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Quantum Chromodynamics and Particle Interactions
- Ionosphere and magnetosphere dynamics
- Plasma Applications and Diagnostics
- Dust and Plasma Wave Phenomena
- High-Energy Particle Collisions Research
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- High voltage insulation and dielectric phenomena
- Magnetic Field Sensors Techniques
- Neutrino Physics Research
- Nuclear physics research studies
- Electrostatic Discharge in Electronics
- Metal and Thin Film Mechanics
- Electrohydrodynamics and Fluid Dynamics
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Semiconductor materials and devices
- Birth, Development, and Health
- Pregnancy and preeclampsia studies
- Theoretical and Computational Physics
- Neonatal Respiratory Health Research
Sapporo City General Hospital
2006-2022
University of Michigan
2020
Jagiellonian University
2019
Institute of Physics
2019
Yamagata University
1990-2012
Eaton (Taiwan)
2002
Tohoku Gakuin University
1978-2001
Yamagata University Hospital
1998-2000
Gunma University
1997
Brown University
1982-1992
High-statistics data from two exposures of the BNL 7-foot deuterium bubble chamber to a wide-band-neutrino beam with an average energy 1.6 GeV were analyzed for exclusive pion production in charged-current neutrino-deuterium interactions. For single-pion reactions, properties ${\ensuremath{\Delta}}^{++}$ and decay as well final results isospin analysis are presented. New multipion also
The weak nucleon axial-vector (${F}_{A}$) and vector (${F}_{V}$) form factors are determined from the momentum-transfer-squared (${Q}^{2}$) distributions using $2538{\ensuremath{\mu}}^{\ensuremath{-}}p$ $1384{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\Delta}}^{++}$ events. data were obtained 1 800 000 pictures taken in BNL 7-foot deuterium-filled bubble chamber exposed to a wide-band neutrino beam with mean energy ${E}_{\ensuremath{\nu}}=1.6$ GeV. In framework of conventional...
We present results for quark cluster probabilities in nuclei based on the assumptions of model. first perform numerical evaluations a=2, 3, and 4 realistic nuclear wave functions probability that a chosen at random nucleus is found color singlet consisting 6, 9, etc., quarks. Clustering itself determined by geometrical overlap three-quark systems depends critical distance separation 2${R}_{c}$. A systematic comparison obtained these light establishes certain features results, which are...
We have used the Fermilab 30-in. bubble-chamber hybrid spectrometer to study multiparticle production in interactions of 200-GeV/c protons and π+ K+ mesons with nuclei gold, silver, magnesium. find that multiplicities produced particles negative increase linearly number projectile collisions, no beam or target dependence. The secondary collisions nucleus increases significantly less rapidly than has been reported by a streamer chamber experiment. properties suggest they arise from...
Li6.25Al0.25La3Zr2O12 (LLZO) is one of the most promising solid-state electrolytes due to its electrochemical and chemical stability against metallic Li high ionic conductivity at room temperature. Despite favorable attributes, it has been shown that metal can penetrate LLZO above a critical current density (CCD). Currently, mechanism by which this phenomenon occurs not completely elucidated. However, microstructural defects such as grain boundaries have pointed out where preferentially...
Measured breakdown characteristics of a capacitively coupled rf argon discharge at 13.56 MHz are compared with criterion derived from the electron balance model in which difference between longitudinal and transverse diffusion coefficients is taken into account. For right-hand branch minimum V-shaped voltage curves, good agreement observed predicted criteria found case short electrode separations when formation rate calculated terms time-averaged ionization frequency.
Abstract The Abel integral equation in plasma spectroscopy is numerically solved by applying the Bessel four‐point interpolation formula of degree two. method mathematically tractable, simplifying Bockasten method. Tests through numerical simulations show that as accurate more elaborate methods, such Bockasten, Minerbo‐Levy, Piessens, etc.
Distortion of the Langmuir probe characteristic due to random fluctuations is investigated theoretically and experimentally. A statistical method newly introduced reasonably take account effects statistically processes. When in plasma parameters current flowing a are ergodic, time-averaged obtained by taking an ensemble average weighted probability density function fluctuating parameters. Therefore, analysis valid only for fluctuation spectra with frequencies small compared ion frequency....
Current-voltage characteristics of Langmuir probes in a strong magnetic field are presented. The experiments were performed using argon or helium gases with pressure 0.1-5.6 mTorr and the plasma density ranging from 1011 to 1012 cm−3 for 1-5.5 kG. It is found that (1) electron collection cylindrical probe behaves like disk; (2) ion retardation part becomes unmasked over positive potentials as result decreased current; (3) slope its logarithmic plot gives temperature; (4) values (nearly equal...
Abstract Evolution from the linear growth to nonlinearly saturated state of ionization waves (moving striations) is investigated a viewpoint an instability which appears in plasma. The experiments were performed observing backward excited below upper critical current I c xenon, argon, and argon‐mercury gases at pressures order Torr. It found that (1) behavior evolution obeys Landau amplitude equation; (2) does not depend on initial value, but only plasma parameters; (3) squared saturation...
A transition from a moving striation to helical oscillation was observed in the positive column of helium discharge at pressure 0.4 mm Hg as an applied longitudinal magnetic field increased. The frequency and amplitude decreased with increasing field. When reached critical value about 1650 G, appeared two waves were coexist. disappeared further increase field, but continued exist.
An evolution from the linear growth to nonlinear saturated state of instability is investigated by observing spatially growing ionization waves (moving striations) in a plasma. The behavior shown obey Landau amplitude equation. Partial, gradual change zeroth-order conditions effect also found.
We have used the Fermilab 30-in. bubble chamber--hybrid spectrometer to study rapidities of ``produced particles'' in interactions 200-GeV/c protons and ${\ensuremath{\pi}}^{+}$ ${K}^{+}$ mesons with nuclei gold, silver, magnesium. The average rapidity decreases linearly number projectile collisions ${\ensuremath{\nu}}_{p}$ (up ${\ensuremath{\nu}}_{p}$=5) no A dependence little beam dependence. ratio R normalized distributions for hadron-nucleus hadron-proton shows a plateau central region,...
A simple ion temperature measurement method in a magnetic field using an electrostatic capped probe is presented and tested. The with the axis oriented parallel small cylinder whose flat tip insulated cap to inhibit electron inflow field. collector current, essentially less affected, becomes comparable or larger than saturation usual retarding potential technique can be used measure temperature. Measurements were made diffused helium plasma density 1010 ∼ 1013 cm−3 at gas pressure ∼mTorr 0.8...
Abstract Wave nature of stationary moving striations in helium and neon discharges a uniform longitudinal magnetic field is studied. With the increase field, frequency natural decreases, while wave length increases, they damp out at high region. Artificial excitations these gases show that proportional to excitation for given slope linear lines increases with field. These explained following dispersion relation derived from consideration waves ionization including effects on ionization.
It is widely experienced that the accurate measurement of space potential in gas discharges by means a Langmuir probe rather difficult. The glowing introduced to solve this difficulty. has mechanism for producing an auxiliary glow discharge and emits electrons from surface into plasma be measured. given as separating point two curves measured with without current.
Abstract Moving striations in the tapered tube with smoothly changing radius are studied experimentally. The frequency depends on local by nature and increases toward narrow end of tube, independent direction magnitude discharge current. Radius‐frequency versus radius‐pressure is compatible similarity law for cylindrical tubes. When there appears synchronization, becomes apparently constant throughout column. wavelength shows different dependences without synchronization. An important role...