According to a recent report by the Physicist Organization Network, scientists at the US Department of Energy's Princeton Plasma Physics Laboratory (PPPL) used an inflatable imaging system to study plasma turbulence in a Tokamak nuclear fusion reactor and obtained edge turbulence. Two-dimensional structure and established a large database. The new study will help scientists find the main cause of heat and particle leakage in Tokamak devices, allowing nuclear fusion to provide safe, clean and abundant energy for the world as soon as possible.
Nuclear fusion is a natural phenomenon that occurs in space. For example, in the center of the sun, a naturally powerful gravitational field confines the high-temperature plasma, causing fusion reactions in the nucleus within it, releasing enormous energy, as does other stars. Researchers are designing nuclear fusion devices like Tockmark, using magnetic fields to control high-temperature plasmas, and providing continuous clean energy for humans through controlled nuclear fusion reactions. However, high-temperature plasma frequently forms turbulent flow, which causes the loss of heat and plasma, making nuclear fusion impossible.
In a new study published in the latest issue of the journal Plasma Physics, PPPL physicist Stewart Zweben led the team to detailed data on the spatial correlation of turbulence in two dimensions. They selected a representative plasma sample and used a gas imaging system to image the turbulence near the plasma edge during 20 plasma outflows. Jets in gas imaging systems are a source of neutral atoms that emit light when the turbulence intensity changes. The fast camera can remove the two-dimensional structural details of these turbulences with high resolution, allowing researchers to recognize the turbulence intensity fluctuations.
Zveb\x{92e8}e and colleagues performed a computer analysis of the photo data and found that the shape of the spatial structure of the turbulent flow is very similar to the floating clouds in the air, just as some large clouds will merge to form a larger structure, and some clouds will split into more In small structures, positive correlation or negative correlation may also occur between different turbulences, that is, turbulence in a part of the plasma will change with another part of turbulence. Zverben said that the in-depth study of the turbulence correlation can help scientists find the location of the turbulence that causes heat leakage, and also help to test the existing turbulence computer model. (Reporter Nie Cuirong)
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