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Laboratory evidence of dynamo amplification of magnetic fields in a turbulent plasma

机译:湍流等离子体中磁场放大的实验室证据

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摘要

Magnetic fields are ubiquitous in the Universe. The energy density of these fields is typically comparable to the energy density of the fluid motions of the plasma in which they are embedded, making magnetic fields essential players in the dynamics of the luminous matter. The standard theoretical model for the origin of these strong magnetic fields is through the amplification of tiny seed fields via turbulent dynamo to the level consistent with current observations. However, experimental demonstration of the turbulent dynamo mechanism has remained elusive, since it requires plasma conditions that are extremely hard to re-create in terrestrial laboratories. Here we demonstrate, using laser-produced colliding plasma flows, that turbulence is indeed capable of rapidly amplifying seed fields to near equipartition with the turbulent fluid motions. These results support the notion that turbulent dynamo is a viable mechanism responsible for the observed present-day magnetization.
机译:磁场在宇宙中无处不在。这些场的能量密度通常可与嵌入它们的等离子体的流体运动的能量密度相媲美,从而使磁场成为发光物质动力学必不可少的参与者。这些强磁场起源的标准理论模型是通过湍流发电机将微小的种子场放大到与当前观测值一致的水平。但是,湍流发电机机理的实验演示仍然难以捉摸,因为它需要非常难以在地面实验室中重建的等离子体条件。在这里,我们证明了,利用激光产生的碰撞等离子体流,湍流确实能够迅速将种子场放大到与湍流运动几乎等分。这些结果支持了湍流发电机是负责观察到的当今磁化强度的可行机制的观点。

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