Turbulence in fluids is a very common, fascinating and complex phenomenon in nature. Although people have carried out a lot of research on it with the latest technological means such as experiments and large-scale computer simulations, it has not yet fully understood it. The turbulence in the high-temperature and high-density plasma related to laser nuclear fusion research is more complicated. On the one hand, the nonlinear electromagnetic force is introduced. On the other hand, the time and space scale of this turbulence occurs faster and smaller The latter poses a greater challenge to experimental diagnosis.
Recently, the Institute of Physics, Chinese Academy of Sciences / Beijing National Laboratory for Condensed Matter Physics (Physics) Laboratory of High Power Laser High Energy Density Physics, together with collaborators from Shanghai Jiaotong University and India Research on the generation of ultra-strong magnetic fields and turbulence has been carried out. Experiments have observed that a strong magnetic field of nearly 100 megagauss is generated in a certain area inside the plasma, and the spatial distribution of the magnetic field exhibits turbulent characteristics. The Institute of Physics Ding Wenjun, Hao Biao, Dr. Wang Weimin and Professor Sheng Zhengming of Shanghai Jiaotong University carried out large-scale numerical simulation and theoretical analysis of the experimental results, which strongly supported the experimental observation.
This research is of great significance for understanding and controlling the transport of high-current electron beams in fast-ignition laser nuclear fusion, and also helps people to deepen their understanding of the phenomenon of high temperature and dense celestial bodies. Over the past decade, with the development of experimental technology, laboratory astrophysics has gradually developed, and the interaction of strong lasers and plasma is an important means of laboratory astrophysics research.
The above research was published in Proceedings of the National Academy of Sciences [PNAS, vol. 109 (21), 8011-8015] The influential Indian newspaper The Telegraph in its science column Knowhow, titled Reach for the Stars, specifically introduced this collaborative research (link).
This work was supported by the National Fund Committee, the Ministry of Science and Technology and the Chinese Academy of Sciences.
Thesis link
The time evolution of the magnetic field observed in experiments and numerical simulations [(a) and (b)] and its spatial distribution [(c)-(e)]. (a) is the evolution curve of the observed magnetic field strength with time, (b) is the corresponding particle simulation result. (c) is the spatial distribution of the magnetic field at different times obtained by particle simulation, and (d) and (e) are the spatial distribution of the magnetic field at 3.2 picoseconds in the experiment.
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