Two-plasmon decay instability of the backscattered light of stimulated Raman scattering

Two-plasmon decay instability of the backscattered light of stimulated Raman scattering
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受激拉曼散射反向散射光的双等离子体衰变不稳定性

DOI:
10.1088/1741-4326/aad059
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发表时间:
2018-07
期刊:
影响因子:
3.3
通讯作者:
L Guo
L Guo
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Kaiqiang Pan;S E Jiang;Q Wang;L Guo

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首先利用一维和二维粒子模拟方法研究了模拟拉曼散射(SRS)后向散射光的双等离激元衰减(TPD)不稳定性。二维PIC模拟结果表明,受激喇曼散射的后向散射光确实激发了TPD不稳定性。进一步比较了一维和二维的PIC模拟结果,发现TPD不稳定性的激发抑制了后向受激喇曼散射,说明散射光的TPD不稳定性可能是受激喇曼散射的一种饱和机制。研究还表明,在TPD激发后,电子可以经历两级甚至三级加速,其能量可以达到甚至超过100 KeV,这意味着背散射光的TPD不稳定性可能是超热电子的来源。
The two-plasmon decay (TPD) instability of the backscattered light of the simulated Raman scattering (SRS) is first investigated with the help of one-dimensional (1D) and two-dimensional (2D) particle-in-cell (PIC) simulations. The 2D PIC simulation results show that the backscattered light of the SRS does excite TPD instability. Further, the comparison between 1D and 2D PIC simulation results shows that the backward SRS is suppressed by the excitation of TPD instability, which means the TPD instability of the scattered light could be a saturation scheme of SRS. It is also shown that, after the excitation of TPD, the electrons could experience a two-stage or even three-stage acceleration and their energy may reach to or even exceed 100 KeV, which means the TPD instability of the backscattered light could be a source of super-hot electrons.
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影响因子: 4.8
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