Kazutaka Nishiyama
A5031630785- Plasma Diagnostics and Applications
- Astro and Planetary Science
- Particle accelerators and beam dynamics
- Electrohydrodynamics and Fluid Dynamics
- Planetary Science and Exploration
- Ionosphere and magnetosphere dynamics
- Cryptographic Implementations and Security
- Atomic and Molecular Physics
- Spacecraft Design and Technology
- Solar and Space Plasma Dynamics
- Dust and Plasma Wave Phenomena
- Spacecraft and Cryogenic Technologies
- Plasma Applications and Diagnostics
- Pulsars and Gravitational Waves Research
- Spacecraft Dynamics and Control
- Mass Spectrometry Techniques and Applications
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Space Satellite Systems and Control
- Advanced Data Storage Technologies
- Bluetooth and Wireless Communication Technologies
- Magnetic confinement fusion research
- Laser-induced spectroscopy and plasma
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
Japan Aerospace Exploration Agency
2014-2024
Institute of Space and Astronautical Science
2014-2024
The University of Tokyo
2019-2022
Kitakyushu City Hospital Organization
2022
Japan Atomic Energy Agency
2011
International Society of Automation
2009
The objectives of the DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO) are to open a new window observation for gravitational wave astronomy and obtain insight into significant areas science, such as verifying characterizing inflation, determining thermal history universe, dark energy, describing formation mechanism supermassive black holes in center galaxies, testing alternative theories gravity, seeking hole matter, understanding physics neutron stars searching planets...
DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) is the planned Japanese space gravitational antenna, aiming to detect waves from astrophysically and cosmologically significant sources mainly between 0.1 Hz 10 thus open a new window for astronomy universe. will consists of three drag-free spacecraft arranged in an equilateral triangle with 1000 km arm lengths whose relative displacements are measured by differential Fabry-Perot interferometer, four units triangular...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. DECIGO expected to open a new window of observation for astronomy especially between 0.1 Hz and 10 Hz, revealing various mysteries universe such as dark energy, formation mechanism supermassive black holes, inflation universe. The pre-conceptual design consists three drag-free spacecraft, whose relative displacements are measured by differential Fabry-Perot Michelson...
The electron cyclotron resonance ion engine has long life and high reliability because of electrodeless plasma generation in both the generator neutralizer. Four μ10s, each generating a thrust 8 mN, specific impulse 3200 s, consuming 350 W electric power, propelled Hayabusa asteroid explorer launched on May 2003. After vacuum exposure several baking runs to reduce residual gas, system established continuous acceleration. Electric delta-V Earth gravity assist, new orbit change scheme that...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. The goal of DECIGO to detect waves from various kinds sources mainly between 0.1 Hz and 10 thus open a new window observation for astronomy. will consist three drag-free spacecraft, 1000 km apart each other, whose relative displacements are measured by Fabry—Perot Michelson interferometer. We plan launch pathfinder first demonstrate technologies required realize and, if...
Hayabusa2 is the second asteroid sample return mission by JAXA. The ion engine system (IES) for based on that developed Hayabusa with modifications necessary to improve durability, increase thrust 20%, and reflect lessons learned from mission. will rendezvous a near-earth 1999 JU3 take samples its surfaces. More scientific instruments than including an impactor make crater landers be board thanks enhancement of IES. An improved neutralizer stronger magnetic field longer life has been under...
A space gravitational-wave antenna, DECIGO (DECI-hertz interferometer Gravitational wave Observatory), will provide fruitful insights into the universe, particularly on formation mechanism of supermassive black holes, dark energy and inflation universe. In current pre-conceptual design, be comprising four units; each unit formed by three drag-free spacecraft with 1000 km separation. Since an extremely challenging mission high-precision flight long baseline, it is important to increase...
The basic properties of an air breathing ion engine, which uses upper atmospheric gases as a propellant, were experimentally investigated. environment in sub-low Earth orbit (altitude 140–200 km) was simulated by laser detonation beam source, has been previously used studies on atomic oxygen-induced material degradation. the engine studied using hyperthermal beam. It is suggested that molecules thermalized scattering at reflector surface engine. efficiency collimator investigated and found...
Two optical fiber measurement techniques are used in this paper to reveal the physical mechanism of enhancement thrust force electron cyclotron resonance ion thruster. The beam current thruster was increased previous studies by changing propellant injection method. In study, observe difference plasma distributions, probes were inserted into under acceleration. first laser absorption spectroscopy. By traversing fiber, number densities obtained along center axis. second an electric-optic...
Anionbeam opticsfora10-cm-diam 400-W-classmicrowavedischargeion thrusterwasfabricatedanditsapplicabilityto along-termspacemissionwasdemonstrated.Theopticsconsistsofthree1-mm-thick e atcarbon ‐carbon composite panels with approximately 800 holes that were mechanically drilled and positioned § 0:02-mmaccuracy.Whenmounted onanaluminum ring,spacingforthethreegridswaskeptat0.5 mm bythreesetsofspacers. The thruster produced an ion beam current of 140 mA a microwave power 32 W for plasma generation...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the planned Japanese space gravitational antenna, aiming to detect waves from astrophysically and cosmologically significant sources mainly between 0.1 Hz 10 thus open a new window for astronomy universe. DECIGO will consist of three drag-free spacecraft, 1000 km apart each other, whose relative displacements are measured by differential Fabry-Perot interferometer. We plan launch in middle 2020s, after sequence two...
Microwave discharge ion engines " <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$mu 10$</tex> are dedicated to the main propulsion on HAYABUSA asteroid explorer. In a development program, various tests and assessments were conducted spacecraft. They include endurance tests, an electromagnetic interference susceptibility test, test between plasma communication microwave, beam exhaust spacecraft, with solar array, so on. The spacecraft was...
This paper reports the numerical investigation of plasma properties for microwave discharge ion thruster μ10. The model consists a particle in cell simulation and Monte Carlo collision simulation. results indicate that density electron temperature confined region are larger than those other regions qualitatively consistent with probe measurements. Moreover, we traced trajectories charged particles to investigate generation transport. electrons strongly by mirror magnetic field sheath, which...
The μ10 cathode-less electron cyclotron resonance ion engines, have propelled the Hayabusa asteroid explorer for seven years since its launch in May 2003. spacecraft was focused on demonstrating technology needed a sample return from an asteroid, using electric propulsion, optical navigation, material sampling zero gravity field, and direct re-entry heliocentric orbit. final stage of cruise subsequent trajectory correction maneuvers been accomplished by special combined operation neutralizer...
The cathode-less electron cyclotron resonance ion engines, μ10, propelled the Hayabusa asteroid explorer, launched in May 2003, which is focused on demonstrating technology needed for a sample return from an asteroid, using electric propulsion, optical navigation, material sampling zero gravity field, and direct re-entry heliocentric orbit. It rendezvoused with Itokawa after two year deep space flight delta-V of 1.4 km/s, 22 kg xenon propellant consumption 25800 hours total accumulated...
An understanding of the plasma physics inside a microwave discharge cathode is key to extending lifetime ion thruster systems. However, probes can only measure plume region due their low spatial resolution and electromagnetic disturbance. In this study, we develop discharge-based with small optical window in chamber that provides visual access interior. The has same anode currents as those flight model diode mode (anode voltage error within 7%). Laser-induced fluorescence spectroscopy...
The electron cyclotron resonance ion engine, “μ10,” has a long life and high reliability because of electrodeless plasma generation in both the generator neutralizer. Four μ10, each generating thrust 8 mN, specific impulse 3,200 seconds, consuming 350 W electric power, propel “HAYABUSA” asteroid explorer that was launched on May 2003. After vacuum exposure several runs baking to reduce residual gas, engine system established continuous acceleration. Delta-V Earth Gravity Assist, new orbit...