磁助直接laser加速产生欠密相对论热等离子体
Underdense relativistically thermal plasma produced by magnetically assisted direct laser acceleration
摘要：
我们介绍了第一种方法，体积产生相对论热等离子体在气体射流可及密度。使用完全动力学模拟和理论，我们证明了两个阶段的直接激光加速驱动的两个激光脉冲在外加磁场可以加热一个显着的等离子体体积多兆电子伏的平均能量。最高的动量特征是2D各向同性的，在相互作用后仍然存在，并且包括大多数电子，使得实验能够首次在光学可诊断的制度中获得体相对论的高能量密度等离子体。
英文摘要：
We introduce the first approach to volumetrically generate relativistically thermal plasma at gas-jet--accessible density. Using fully kinetic simulations and theory, we demonstrate that two stages of direct laser acceleration driven by two laser pulses in an applied magnetic field can heat a significant plasma volume to multi-MeV average energy. The highest-momentum feature is 2D-isotropic, persists after the interaction, and includes the majority of electrons, enabling experimental access to bulk-relativistic, high-energy-density plasma in an optically diagnosable regime for the first time.
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