Publications by authors named "Taichi Morita"
Article Synopsis
- Laser experiments are being used in astronomy to enhance our understanding of phenomena like supernova explosions and their effects on the interstellar medium.
- The research focuses on the interaction between hydrodynamic instabilities and magnetic fields, particularly through a new experimental setup designed to study magnetized Richtmyer-Meshkov instability (RMI).
- The findings confirm that magnetic field amplification is linked to the growth of RMI, which is crucial for understanding magnetic fields in astrophysical events and has implications for fields like fusion energy and planetary science.*
A high-sensitivity sensor to measure titanium atom density based on time-resolved cavity ring-down spectroscopy (CRDS) was developed to monitor the wall erosion and predict the lifetime of Hall thrusters. The minimum detection limit for the sensor was dependent on the discharge current oscillation in the Hall thruster. A Volterra engine management system was employed for time-resolved measurements to develop the time-resolved CRDS system, which was synchronized to the discharge current oscillation.
View Article and Find Full Text PDFWe have successfully developed a portable pulsed magnetic field generation system incorporating a number of techniques to avoid the effects of noise, including shielding, a self-power capability, and a high-capability semiconductor switch. The system fits into a cubical box less than 0.5 m in linear dimensions and can easily be installed in experimental facilities, including noisy environments such as high-power laser facilities.
View Article and Find Full Text PDFWhen comets interacting with solar wind, straight and narrow plasma tails will be often formed. The most remarkable phenomenon of the plasma tails is the disconnection event, in which a plasma tail is uprooted from the comet's head and moves away from the comet. In this paper, the interaction process between a comet and solar wind is simulated by using a laser-driven plasma cloud to hit a cylinder obstacle.
View Article and Find Full Text PDFWe report an experimental demonstration of controlling plasma flow direction with a magnetic nozzle consisting of multiple coils. Four coils are controlled separately to form an asymmetric magnetic field to change the direction of laser-produced plasma flow. The ablation plasma deforms the topology of the external magnetic field, forming a magnetic cavity inside and compressing the field outside.
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- * When exposed to external magnetic fields of 200-300 T, the thermal conduction of electrons is significantly reduced, altering their movement due to the shorter Larmor radius compared to their mean free path.
- * The presence of these strong magnetic fields enhances the velocity of polystyrene foil driven by lasers and amplifies the growth of surface corrugations due to nonuniform plasma pressure distributions influenced by the magnetic field.
We demonstrate the generation of high magnetic fields for condensed matter research using a high-power laser system. A cavity in which a seed magnetic field is applied is compressed by a kJ ns laser pulse. The time history of the compressed magnetic field is monitored by observing the Faraday effect rotation of polarization of a probe pulse in a glass fiber.
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