大尺度预等离子体存在下相对论性laser -固体相互作用中外磁场作用下的可控超高能电子
The controllable super-high energetic electrons by external magnetic fields at relativistic laser-solid interactions in the presence of large scale pre-plasmas
摘要：
本文将两阶段电子加速模型[arXiv：1512.02411和arXiv：1512.07546]推广到研究相对论强度和存在大尺度预制等离子体的激光磁化等离子体相互作用。结果表明，截止电子动能可由外加磁场强度和方向控制。进一步的研究表明，对于强度为$10^{20}\ \text{W}/\text{cm}^2$、等离子体尺度长度为$10\ μ\text{m}$的右旋圆偏振激光（RH-CP），当沿激光传播方向加载超过$10000\ \text{T}$（或$B=ω_{c}/ω_0>1$）的均匀外磁场时，截止电子动能可高达$500\ \text{MeV}$，与无外磁场时的$120\ \text{MeV}$相比有显著提高.在相对论性激光磁化等离子体与$B=ω_{c}/ω_0>1$相互作用中，确定了激光前沿锐化机制，这是这些超高能量电子的原因。
英文摘要：
The two stage electron acceleration model [arXiv: 1512.02411 and arXiv: 1512.07546] is extended to the study of laser magnetized-plasmas interactions at relativistic intensities and in the presence of large-scale preformed plasmas. It is shown that the cut-off electron kinetic energy is controllable by the external magnetic field strength and directions. Further studies indicate that for a right-hand circularly polarized laser (RH-CP) of intensity $10^{20}\ \text{W}/\text{cm}^2$ and pre-plasma scale length $10\ μ\text{m}$, the cut-off electron kinetic energy can be as high as $500\ \text{MeV}$, when a homogeneous external magnetic field of exceeding $10000\ \text{T}$ (or $B=ω_{c}/ω_0>1$) is loaded along the laser propagation direction, which is a significant increase compared with that $120\ \text{MeV}$ without external magnetic field. A laser front sharpening mechanism is identified at relativistic laser magnetized-plasmas interactions with $B=ω_{c}/ω_0>1$, which is responsible for these super-high energetic electrons.
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