Anomalous hot electron generation via stimulated Raman scattering in plasma with up-ramp density profiles

X.Y. Jiang; S.M. Weng; H.H. Ma; C.F. Wu; Z. Liu; M. Chen; B. Eliasson; Z.M. Sheng

doi:10.1088/1361-6587/ad230a

Anomalous hot electron generation via stimulated Raman scattering in plasma with up-ramp density profiles

X.Y. Jiang, S.M. Weng, H.H. Ma, C.F. Wu, Z. Liu, M. Chen, B. Eliasson, Z.M. Sheng

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Abstract

We investigate the evolution and propagation of the electron plasma waves (EPWs) excited by stimulated Raman scattering (SRS) in the inhomogeneous plasma theoretically and numerically with particle-in-cell (PIC) simulations. A theoretical model of EPWs in inhomogeneous plasmas is presented, which shows that the evolution of the EPW wavenumber is mainly related to the plasma density profile rather than the plasma electron temperature, in agreement with PIC simulations. When the density gradient is positive along the propagation direction of an EPW, its wavenumber decreases with time and consequently its phase velocity increases continuously, causing the trapped electrons to be accelerated to anomalous high energy. Furthermore, it is found that the Langmuir decay instability tends to reduce the levels of SRS saturation and electron acceleration and produce hot electrons in the opposite direction. This work provides a new understanding of electron heating due to SRS excitation.

Original language	English
Article number	035015
Number of pages	10
Journal	Plasma Physics and Controlled Fusion
Volume	66
Issue number	3
DOIs	https://doi.org/10.1088/1361-6587/ad230a
Publication status	Published - 8 Feb 2024

Funding

This work is supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA25050100), the National Natural Science Foundation of China (Grant Nos. 11991074, 11975154, 12135009 and 12005287). This work has been carried out partially within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200-EUROfusion). Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union or the European Commission.

Keywords

inertial confinement fusion
stimulated Raman scattering
electron plasma wave
hot electron

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10.1088/1361-6587/ad230a

Jiang-etal-PPCF-2024-Anomalous-hot-electron-generation-via-stimulatedAccepted author manuscript, 1.63 MBLicence: CC BY-NC-ND 4.0

Cite this

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title = "Anomalous hot electron generation via stimulated Raman scattering in plasma with up-ramp density profiles",

abstract = "We investigate the evolution and propagation of the electron plasma waves (EPWs) excited by stimulated Raman scattering (SRS) in the inhomogeneous plasma theoretically and numerically with particle-in-cell (PIC) simulations. A theoretical model of EPWs in inhomogeneous plasmas is presented, which shows that the evolution of the EPW wavenumber is mainly related to the plasma density profile rather than the plasma electron temperature, in agreement with PIC simulations. When the density gradient is positive along the propagation direction of an EPW, its wavenumber decreases with time and consequently its phase velocity increases continuously, causing the trapped electrons to be accelerated to anomalous high energy. Furthermore, it is found that the Langmuir decay instability tends to reduce the levels of SRS saturation and electron acceleration and produce hot electrons in the opposite direction. This work provides a new understanding of electron heating due to SRS excitation.",

keywords = "inertial confinement fusion, stimulated Raman scattering, electron plasma wave, hot electron",

author = "X.Y. Jiang and S.M. Weng and H.H. Ma and C.F. Wu and Z. Liu and M. Chen and B. Eliasson and Z.M. Sheng",

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T1 - Anomalous hot electron generation via stimulated Raman scattering in plasma with up-ramp density profiles

AU - Jiang, X.Y.

AU - Weng, S.M.

AU - Ma, H.H.

AU - Wu, C.F.

AU - Liu, Z.

AU - Chen, M.

AU - Eliasson, B.

AU - Sheng, Z.M.

PY - 2024/2/8

Y1 - 2024/2/8

N2 - We investigate the evolution and propagation of the electron plasma waves (EPWs) excited by stimulated Raman scattering (SRS) in the inhomogeneous plasma theoretically and numerically with particle-in-cell (PIC) simulations. A theoretical model of EPWs in inhomogeneous plasmas is presented, which shows that the evolution of the EPW wavenumber is mainly related to the plasma density profile rather than the plasma electron temperature, in agreement with PIC simulations. When the density gradient is positive along the propagation direction of an EPW, its wavenumber decreases with time and consequently its phase velocity increases continuously, causing the trapped electrons to be accelerated to anomalous high energy. Furthermore, it is found that the Langmuir decay instability tends to reduce the levels of SRS saturation and electron acceleration and produce hot electrons in the opposite direction. This work provides a new understanding of electron heating due to SRS excitation.

AB - We investigate the evolution and propagation of the electron plasma waves (EPWs) excited by stimulated Raman scattering (SRS) in the inhomogeneous plasma theoretically and numerically with particle-in-cell (PIC) simulations. A theoretical model of EPWs in inhomogeneous plasmas is presented, which shows that the evolution of the EPW wavenumber is mainly related to the plasma density profile rather than the plasma electron temperature, in agreement with PIC simulations. When the density gradient is positive along the propagation direction of an EPW, its wavenumber decreases with time and consequently its phase velocity increases continuously, causing the trapped electrons to be accelerated to anomalous high energy. Furthermore, it is found that the Langmuir decay instability tends to reduce the levels of SRS saturation and electron acceleration and produce hot electrons in the opposite direction. This work provides a new understanding of electron heating due to SRS excitation.

KW - inertial confinement fusion

KW - stimulated Raman scattering

KW - electron plasma wave

KW - hot electron

U2 - 10.1088/1361-6587/ad230a

DO - 10.1088/1361-6587/ad230a

M3 - Article

SN - 0741-3335

VL - 66

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 3

M1 - 035015

ER -

Anomalous hot electron generation via stimulated Raman scattering in plasma with up-ramp density profiles

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