Faraday effect on stimulated Raman scattering in the linear region

Liu, Z. J.; Li, B; Xiang, Jin; Cao, Lihua; Zheng, Chunyang; Liang, Hao

doi:10.1088/1361-6587/aaae32

Cited by 11 publications

(9 citation statements)

References 33 publications

(41 reference statements)

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“…When B x = 46.5 T, the Larmor radius of electrons moving at thermal velocity is equal to the waist width of the laser beam, so the transverse diffusion of the electrons is greatly weakened. And according to the result in [24], Faraday effect deflects the incident light by 0.21 rad/100 µm, and deflects the scattered light by 0.76 rad/100 µm. Therefore, both the Faraday effect and the hot electron propagation can be prominent.…”

Section: Weibel Instability Of Bsrs In Magnetized Plasmasmentioning

confidence: 95%

“…The effects of the magnetic field on both SRS and Weibel instability have been widely studied. A longitudinal magnetic field in the plasma will affect the SRS from two aspects: on the one hand, both the incident light and scattering light have Faraday effect [24], and their deflected angles are different. As a result, the driving force of the EPW decreases, and the scattering level of SRS also decreases.…”

Section: Introductionmentioning

confidence: 99%

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Weibel instability induced by kinetic stimulated Raman scattering in unmagnetized and magnetized plasmas

Zhou¹,

Zheng²,

Liu³

et al. 2022

Plasma Phys. Control. Fusion

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The kinetic stimulated Raman scattering(SRS) is found to result in signiﬁcant Weibel-generated magnetic ﬁelds via 2D particle-in-cell(PIC) simulations. During the high-intensity laser pulse, the daughter electron plasma waves(EPWs) of SRS heat the electrons eﬀectively and lead to anisotropy in the velocity space. This anisotropy results in the development of a quasi-static magnetic ﬁeld near the laser speckle, and the growth rate has been discussed. The results show that the kinetic SRS can lead to an averaged magnetic ﬁeld of more than 10 T, which can be an important magnetic ﬁeld source in laser-plasma experiments. Besides, the energy of the Weibel-ﬁeld undergoes an oscillatory rise with the SRS bursts and can be stable after cutting oﬀ the laser. Moreover, in the magnetized plasmas, the application of a longitudinal magnetic ﬁeld enhances the SRS, but interestingly, it signiﬁcantly reduces the growth rate of Weibel instability. Simulation results also indicate that a small transverse magnetic ﬁeld can evidently change the motion of the hot electrons, which dramatically destroys the symmetry of the SRS and the Weibel-generated magnetic ﬁelds.

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Section: Weibel Instability Of Bsrs In Magnetized Plasmasmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Weibel instability induced by kinetic stimulated Raman scattering in unmagnetized and magnetized plasmas

Zhou¹,

Zheng²,

Liu³

et al. 2022

Plasma Phys. Control. Fusion

Self Cite

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show abstract

“…In recent years, more and more attention has been paid to the effect of magnetic fields on LPIs. [10][11][12][13][14][15][16][17][18][19][20][21] Montgomery et al pointed out that an external magnetic field of 7.5 T can significantly increase the electron temperature and improve the laser coupling in hohlraum plasmas. [13] Li et al presented a new staged hot-electron acceleration mechanism involving the two-plasmon decay (TPD) instability in the transverse magnetic field and showed that the hot electrons generated by the forward EPW of TPD can be trapped and accelerated again by the backward EPW of TPD, eventually obtaining higher energy.…”

Section: Introductionmentioning

confidence: 99%

“…[14] Liu et al studied the effects of an axial magnetic field on the propagation of a linearly polarized laser in plasmas and found that the reflectivity level of SRS was significantly decreased due to the Faraday rotation effect. [15] Pan et al investigated SRS of a left-handed circularly polarized laser in strongly axially magnetized plasmas. The results showed that the external axial magnetic field can not only decrease the linear growth rate and the saturation level of SRS, but also excite SRS instability in over quarter-critical density plasmas.…”

Section: Introductionmentioning

confidence: 99%

Suppression of stimulated Brillouin and Raman scatterings using an alternating frequency laser and transverse magnetic fields

Cheng 程,

Li 李,

Wang 王

et al. 2024

Chinese Phys. B

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A novel scheme to suppress both stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) by combining an alternately changing frequency laser and a transverse magnetic field is proposed. The alternating frequency (AF) laser allows the laser frequency to change discretely and alternately over time. The suppression of SBS is significant as long as the AF difference is greater than the linear growth rate of SBS or the alternating time of laser frequency is less than the linear growth time of SBS. However, the AF laser is ineffective to suppress SRS that usually has a much higher linear growth rate than SBS. To remedy that, a transverse magnetic field is also joined to suppress the SRS instability. The electrons trapped in the electron plasma waves (EPWs) of SRS can be accelerated by the surfatron mechanism in a transverse magnetic field and eventually detrapped. While continuously extracting energy from EPWs, the EPWs are dissipated and the kinetic inflation of SRS is also suppressed. The one-dimensional particle-in-cell simulation results show that both SBS and SRS can be effectively suppressed by combining the AF laser and a transverse magnetic field with tens of tesla, and the total reflectivity can be dramatically reduced by more than one order of magnitude. These results provide a potential reference value for controlling SBS and SRS under the related parameters of inertial confinement fusion.

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“…The difference is that the former one induces spatial decoupling, rather than temporal decoupling. Sukhdeep Kaur et al [22] and Z J Liu et al [23] respectively derived the linear theory of SRS immersed in a static longitudinal magnetic field by fluid theory and gave the numerical solution. Afterwards, K Q Pan et al [24] carried out the PIC simulation about the SRS driven by circularly polarized laser in strongly magnetized plasma.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stimulated Raman scattering in longitudinal magnetized plasma by theory and kinetic simulation

Zhou¹,

Yin²,

Pan³

et al. 2021

Plasma Sci. Technol.

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Stimulated Raman scattering (SRS) in a longitudinal magnetized plasma is studied by theoretical analysis and kinetic simulation. The linear growth rate derived via one-dimensional fluid theory shows the dependence on the plasma density, electron temperature, and magnetic field intensity. One-dimensional particle-in-cell simulations are carried out to examine the kinetic evolution of SRS under low magnetic intensity of / w w < 0.01. c 0There are two density regions distinguished in which the absolute growth of enveloped electrostatic waves and spectrum present quite different characteristics. In a relatively low-density plasma ( ñ n 0.20 e c ), the plasma wave presents typical absolute growth and the magnetic field alleviates linear SRS. While in the plasma whose density is near the cut-off point ( ñ n 0.23 e c ), the magnetic field induces a spectral splitting of the backscattering and forward-scattering waves. It has been observed in simulations and verified by theoretical analysis. Due to this effect, the onset of reflectivity delays, and the plasma waves form high-frequency oscillation and periodic envelope structure. The split wavenumber / Dk k 0 is proportional to the magnetic field intensity and plasma density. These studies provide novel insight into the kinetic behavior of SRS in magnetized plasmas.

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Faraday effect on stimulated Raman scattering in the linear region

Cited by 11 publications

References 33 publications

Weibel instability induced by kinetic stimulated Raman scattering in unmagnetized and magnetized plasmas

Weibel instability induced by kinetic stimulated Raman scattering in unmagnetized and magnetized plasmas

Suppression of stimulated Brillouin and Raman scatterings using an alternating frequency laser and transverse magnetic fields

Investigation of stimulated Raman scattering in longitudinal magnetized plasma by theory and kinetic simulation

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