A5038696472- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Advanced X-ray Imaging Techniques
- Solar and Space Plasma Dynamics
- CCD and CMOS Imaging Sensors
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Ionosphere and magnetosphere dynamics
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
The University of Tokyo
2023-2024
Kavli Institute for the Physics and Mathematics of the Universe
2023
Heating of charged particles via collisionless shocks, while ubiquitous in the universe, is an intriguing yet puzzling plasma phenomenon. One outstanding question how electrons and ions approach equilibrium after they were heated to different immediate-postshock temperatures. In order fill significant lack observational information downstream temperature-relaxation process, we observe a thermal-dominant X-ray filament northwest SN~1006 with Chandra. We divide this region into four layers...
We are developing an imaging polarimeter by combining a fine-pixel CMOS image sensor with coded aperture mask as part of the cipher project, aiming to achieve X-ray polarimetry in energy range 10–30keV. A successful proof-of-concept experiment was conducted using 2.5μm pixel size. In this study, we beam experiments assess modulation factor (MF) 1.5μm size manufactured Canon and determine if there any improvement MF. The measured MF 8.32%±0.34% at 10keV 16.10%±0.68% 22keV, exceeding those...
We are developing an imaging polarimeter by combining a fine-pixel CMOS image sensor with coded aperture mask as part of the cipher project, aiming to achieve X-ray polarimetry in energy range $10$$\unicode{x2013}$$30~\mathrm{keV}$. A successful proof-of-concept experiment was conducted using $2.5~\mathrm{\mu m}$ pixel size. In this study, we beam experiments assess modulation factor (MF) $1.5~\mathrm{\mu size manufactured Canon and determine if there any improvement MF. The measured MF...
Abstract Heating of charged particles via collisionless shocks, while ubiquitous in the universe, is an intriguing yet puzzling plasma phenomenon. One outstanding question how electrons and ions approach equilibrium after they were heated to different immediate-postshock temperatures. In order fill significant lack observational information downstream temperature-relaxation process, we observe a thermal-dominant X-ray filament northwest SN 1006 with Chandra. We divide this region into four...
X-ray polarization is a powerful tool for unveiling the anisotropic characteristics of high-energy celestial objects. We present novel imaging reconstruction method designed hard polarimeters employing Si CMOS sensor and coded apertures, which function as photoelectron tracker optics, respectively. Faced with challenges posed by substantial artifacts background noise in aperture associated conventional balanced correlation method, we adopt Expectation-Maximization (EM) algorithm foundation...
GRAMS (Gamma-Ray and AntiMatter Survey) is a next-generation proposed balloon-borne/satellite-based mission aimed at high sensitivity MeV gamma-ray astrophysical observations background-free indirect dark matter search via hadronic antiparticles. The main detector of meter-scale liquid argon time projection chamber (LArTPC). adoption as material allows us to produce an unprecedentedly large effective area instrument both for cosmic gamma rays 0.5-20 antiparticles origin. This area, which...
The injection problem is one of the biggest but unresolved issue to understand origin Galactic cosmic rays. To evaluate energy quantitatively, we need measure how much stolen from background thermal plasma. energetic particles causes colder plasma than expected Rankine-Hugoniot relation in ideal gas cases. We electron temperature gradient northwestern, post-shock region SN 1006 with Chandra. It found that increases 0.52–0.62 keV at outer edge 0.82−0.95 inner region, 0.6 pc away shock front....