天美影视

Aoyama Gakuin University A research group led by Professor Ryo Yamazaki and Assistant Professor Shuta Tanaka (College of Science and Engineering Department of Physical Sciences Theoretical Astrophysics Laboratory), Associate Professor Shuichi Matsukiyo, Assistant Professor Tachi Morita, Assistant Professor Shogo Isayama at Kyushu University, Associate Professor Yoichi Sakawa, Professor Yasuhiro Kuramitsu, Assistant Professor Takayoshi Sano at Osaka University, Assistant Professor Tachi Takezaki at Toyama University, Associate Professor Kentaro Tomita at Hokkaido University, Associate Professor Takayuki Umeda at Nagoya University, Assistant Professor Yutaka Ohira, Professor Masahiro Hoshino at the University of Tokyo, and Professor Naofumi Onishi at Tohoku University, has established a new research tool to elucidate the generation mechanism of cosmic rays by generating cosmic plasma shock waves in the laboratory with a large laser. The research group led by Professor Yutaka Ohira and Professor Masahiro Hoshino of the University of Tokyo and Professor Naofumi Onishi of Tohoku University has established a new research tool to elucidate the generation mechanism of cosmic rays by generating cosmic plasma shock waves in the laboratory using a large laser beam.

The plasma that fills space is a supersonic fluid generated by various stellar and astronomical phenomena. Space plasma shock waves are thought to play the role of an energy converter that converts the enormous energy of astronomical phenomena. However, the mechanism of energy conversion is complex and unresolved. Until now, satellite observations have been the only direct means of empirical research on space plasma shock waves.

This time, the research group generated space plasma shock waves in the laboratory using the Gekko XII laser, a large laser at the Institute of Laser Science, Osaka University, to elucidate the structure of shock waves. In the experiment, conditions can be controlled and reproducibility guaranteed. These are advantages that satellite observations do not have, and the addition of experiments as a research tool has the potential to greatly advance research in this field.

Extremely energetic charged particles called cosmic rays are thought to be produced by cosmic plasma shock waves in supernova remnants. Cosmic rays are not only known to cause satellite failures and astronaut exposure, but also have been pointed out to have the potential to affect long-term planetary climate change and the evolution of life. Although cosmic rays were first discovered more than a century ago, no theory has yet been established to explain how they are produced in a consistent manner. Advances in our understanding of the energy conversion process of cosmic plasma shock waves are expected to make great strides toward elucidating the mysteries of cosmic ray production.

The results of this research have been published in two papers in the American scientific journal "Physical Review E". Many graduate and undergraduate students from Toyama Gakuin University, Kyushu University, Osaka University, University of Toyama, and Hokkaido University also participated in the experiment using the large apparatus, taking charge of the acquisition of experimental data, data analysis, discussion of physical interpretation, and design of the experimental apparatus (design of the shape of the magnetic field generating coil, determination of the layout of the measurement devices, etc.) before the experiment. The following paper is also co-authored.

Details】 【Details

Physical Review E (Published August 26, 2022)

Physical Review E (Published February 11, 2022)