A5085897151- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Precipitation Measurement and Analysis
- Particle physics theoretical and experimental studies
- Meteorological Phenomena and Simulations
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Atmospheric aerosols and clouds
- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
- Soil Moisture and Remote Sensing
- Neutrino Physics Research
- Ocean Waves and Remote Sensing
- Microwave Engineering and Waveguides
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Effects in Electronics
- Radio Wave Propagation Studies
- CCD and CMOS Imaging Sensors
- Electromagnetic Simulation and Numerical Methods
- Lightning and Electromagnetic Phenomena
- Thermal Analysis in Power Transmission
The University of Tokyo
2018-2024
Kajima Corporation (Japan)
2023
3-D Matrix (Japan)
2021
Applied Materials (United States)
2007-2017
Doshisha University
2016-2017
Rigaku (Japan)
2014
Jet Propulsion Laboratory
2004-2007
California Institute of Technology
2005-2007
Kansai University
2006
Saga University
1977-2005
Abstract The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports result of a search for decay $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mtext>e</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:math> from data taken first physics run 2021. No excess events over expected background is observed, yielding an...
Abstract The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is successor to which completed data taking 2013. started fully operational 2021, with goal of improving sensitivity $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ <mml:math...
A uniform and active 2.45 GHz microwave plasma is generated with traveling waves in a large area, 180 x300 mm2, along dielectric line. The brightness temperature of the Ar within 644°C ± 17°C. electron density at 200 Pa are about 4 eV x1011 cm-3 respectively, same order these small generators. area can easily be enlarged.
The MEG experiment took data at the Paul Scherrer Institute in years 2009–2013 to test violation of lepton flavor conservation law, which originates from an accidental symmetry that Standard Model elementary particle physics has, and published most stringent limit on charged violating decay μ+→e+γ: BR(μ+→e+γ) <4.2×10−13 90% confidence level. detector has been upgraded order reach a sensitivity 6×10−14. basic principle II is achieve highest possible using full muon beam intensity (7×107...
Specific slow wave structures are needed in order to produce coherent Cherenkov radiation overmoded relativistic generators. The electromagnetic characteristics of such wave, resonant, finite length commonly used backward oscillators have been studied both experimentally and theoretically. In experiments, perturbation techniques were study the fundamental higher symmetric transverse magnetic (TM) modes. Finite effects lead end reflections quantization number. open found from spectral...
Pulse-pair Doppler operation is considered for the spaceborne mission. In a formalism, condition that measured velocity on pulse-pair corresponds to FFT derived. The coherent coupling effect of spectral broadenings between fading and vertical wind shears shown strongly depend flight direction platform. This effect, which has been ignored ground-based airborne radars, characteristic space Two kinds operations, polarization diversity method conventional contiguous method, are studied determine...
Abstract We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $$\upmu ^+ \rightarrow \mathrm {e}^+\mathrm {X}, {X} \upgamma \ $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>e</mml:mi> </mml:mrow> <mml:mi>X</mml:mi> <mml:mo>,</mml:mo> <mml:mi>γ</mml:mi> <mml:mspace /> </mml:math> . This uses dataset resulting from...
A digitally controlled solid-state microwave generator allowing variable frequency operation and precise phase control is adopted for plasma generation. In this study, a resonant cylindrical cavity used as applicator in place of conventional waveguides. order to improve the uniformity, TE111 mode agitated by injecting microwaves into from two spatially orthogonal directions, with temporal difference ϕ. Theoretical analyses finite-difference time-domain simulations derive following effects...
The linear theory of a plasma loaded helix type traveling wave tube amplifier (TWTA) is considered. role on the gain and degree concentration high frequency fields in region studied. Strong enhancements are observed for frequencies which hybrid plasma-slow waves formed. Use allows strong interaction even if beam displaced from immediate vicinity structure. This latter effect could allow development higher power amplifiers with larger cross-sectional areas.
Abstract In this paper a sea surface radar echo spectral analysis technique to correct for the rainfall velocity error caused by radar-pointing uncertainty is presented. The correction procedure quite straightforward when observing homogeneous field. When nonuniform beam filling (NUBF) occurs and attenuating frequencies are used, however, additional steps necessary in order correctly estimate antenna-pointing direction. This new relies on application of combined frequency–time (CFT)...
A new type of plasma asher using surface microwaves propagating on a dielectric line is reported. The ashing process achieved in aflowing afterglow discharge. high rate 3.2 µm/Min over 5-inch wafer at 230°C obtained, pure oxygen pressures close to 130 Pa. Radiation damage the substrate minimized by operating flowing where ion current barely detectable.
The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports result of a search for decay $\mu^+\to e^+\gamma$ from data taken first physics run 2021. No excess events over expected background is observed, yielding an upper limit on branching ratio B($\mu^+\to e^+\gamma$) < $7.5 \times 10^{-13}$ (90% C.L.). combination this and obtained by gives $3.1 C.L.), which most stringent to date. A ten-fold larger sample being collected during years 2022-2023, data-taking will...
A second‐order scattering theory is derived for uniformly oriented spheroidal hydrometeors with a general drop size distribution in single layer. Effects of backscattering enhancement are evaluated nadir pointing radar finite beam width at millimeter wave frequencies. Spheroids uniform first studied to characterize the deviations from spherical theories. For water spheroids, difference between cross term (backscattering term) and ladder (conventional multiscattering becomes larger as...
Creation and diagnosis of plasma in microwave devices remains one the primary challenges electronics. In present work we deal with (1) diagnostic techniques for characterization radially nonuniform columns suitable use high-power sources (2) effects such plasmas on electromagnetic properties finite length, spatially periodic slow wave structures. Experimental studies were performed both a strong weak guiding magnetic field. Using combination resonator (X-band) Langmuir probe, peak density...
Effects of multiple scattering on reflectivity are studied for millimeter wavelength weather radars. A time‐independent vector theory, including up to second‐order scattering, is derived a single layer hydrometeors uniform density and diameter. In this spherical waves with Gaussian antenna pattern used calculate ladder cross terms in the analytical theory. The former represent conventional while latter cause backscattering enhancement both copolarized cross‐polarized components. As optical...
Concept and expected performance of cloud profiling radar (CPR) for EarthCARE are described based on preliminary design study conducted to date. High sensitivity Doppler capability two significant new features in this CPR. Particularly, is the first attempt spaceborne atmospheric radar, which requires great efforts technical development feasibility validation. We have developed a numerical simulation method assess velocity accuracy applicable application, results compared with conventional...
Abstract In this paper, two different numerical methods capable of computing multiple scattering effects in pulsed-radar systems are compared. Both based on the solution time-dependent vectorial form radiative transfer equation: one exploits successive order approximation, other a forward Monte Carlo technique. Different benchmark results presented (including layers monodisperse spherical water and ice particles), which specific interest for W-band spaceborne cloud radars such as CloudSat’s...
This paper outlines the development of dual-frequency precipitation radar (DPR) to be flown on Global Precipitation Mission's core spacecraft. I. INTRODUCTION In Mission (GPM), a dual- frequency is planned The spacecraft serves as high quality reference platform for training and calibrat- ing rain retrieval algorithms used with passive mi- crowave radiometers other constellation satellites. expected provide accu- rate estimates rainfall well drop size distribu- tion (DSD) parameters from...
Self-assembling peptides (TDMs) comprise synthetic amphipathic that immediately react to changes in pH and/or inorganic salts transform into a gelatinous state. The first generation of these (TDM-621) is currently used as hemostatic agent Europe. However, TDM-621 exhibits slow gel-formation and low retention capabilities on tissue surfaces. second (TDM-623) was therefore developed encourage faster better tissue-sealing capabilities.The aim this study verify the efficacy TDM-623 terms its...
A modified relativistic (500 kV, 500 A) backward-wave oscillator (BWO) filled with a radially nonuniform preionized plasma of high-peak density (peak frequency>operating frequency) is studied experimentally. The effects high in the interaction region as well diode and output horn regions were studied. By protecting both against penetration, on BWO was up to peak 8/spl middot/10/sup 12/ cm/sup -3/. It demonstrated that filling structure leads following. 1) Suppression high-order modes. This...
Pulse patterns are designed by adopting variable pulse repetition frequency (VPRF) for space missions involving beam scans in the cross-track direction, especially intended Global Precipitation Measurement Project (GPM). To cope with large variance range from a satellite, which is caused swing and Earth oblateness, systematic algorithm proposed, increasing sampling rates.