Dynamics of ultrafast heated radiative plasmas driven by petawatt laser light
Dynamics of ultrafast heated radiative plasmas driven by petawatt laser light
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DOI：
10.1088/1361-6587/ac4313
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发表时间：
2021-04
影响因子：
2.2
通讯作者：
K. Sugimoto;N. Iwata;A. Sunahara;T. Sano;Y. Sentoku
中科院分区：
文献类型：
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作者：
K. Sugimoto;N. Iwata;A. Sunahara;T. Sano;Y. Sentoku
相对论性的拍瓦激光可以等容地将高Z金属加热到keV以上的温度，并且几乎完全加热。大量的硬X射线从高Z热等离子体发射，其充当X射线源，而X射线发射充当等离子体的能量汇。利用一维和二维粒子模拟方法研究了固体银箔在相对论激光辐照下的等容加热过程，包括库仑碰撞、电离和辐射过程。我们发现，当激光强度小于1019 W cm-2时，keV银等离子体的辐射功率与入射激光功率相当。因此，等离子体形成和粒子加速受到辐射的影响，例如高度压缩的激波形成。一旦激光加热结束，银等离子体就会在皮秒的时间尺度上失去能量，在此期间硬X射线闪烁。给出了keV银等离子体的辐射谱。
A relativistic petawatt laser light can heat a high Z metal above keV temperatures isochorically and ionize it almost fully. Copious hard x-rays are emitted from a high-Z hot plasma, which acts as an x-ray source, while x-ray emissions serve as an energy sink for the plasma. The isochoric heating of a solid silver foil irradiated by a relativistic laser light is studied with the help of 1D and 2D particle-in-cell simulations including Coulomb collisions, ionizations, and radiation processes. We find that the radiation power from the keV silver plasma is comparable to the incident laser power when the laser intensity is less than 1019 W cm−2. Thus, the plasma formation and particle acceleration are affected by the radiation, e.g. a highly compressed shock formation. Once the laser heating is over, the silver plasma loses its energy on a timescale of picoseconds, during which hard x-rays flash. The radiation spectra of the keV silver plasma are also presented.