Investigation of ruling parameters on the growth of side and back stimulated Raman scattering in inhomogeneous plasmas at shock ignition laser intensity

G. Cristoforetti; E. Hume; S. Agarwal; D. Batani; M. Cervenak; P. Devi; R. Dudzak; D. Ettel; P. Gajdos; K. Glize; S. Jelinek; L. Juha; P. Koester; M. Krupka; M. Krus; H. Larreur; G. Malka; D. Mancelli; P. E. Masson-Laborde; A. Morace; Ph. Nicolai; O. Renner; D. Singappuli; S. Singh; M. Tatarakis; X. Yuan; Y. Wang; N. Woolsey; J. Zhang; X. Zhao; L. A. Gizzi

doi:10.1063/5.0257022

Volume 10 Issue 4

Jul. 2025

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Article Navigation > Matter and Radiation at Extremes > 2025 > 10(4): 045401

G. Cristoforetti, E. Hume, S. Agarwal, D. Batani, M. Cervenak, P. Devi, R. Dudzak, D. Ettel, P. Gajdos, K. Glize, S. Jelinek, L. Juha, P. Koester, M. Krupka, M. Krus, H. Larreur, G. Malka, D. Mancelli, P. E. Masson-Laborde, A. Morace, Ph. Nicolai, O. Renner, D. Singappuli, S. Singh, M. Tatarakis, X. Yuan, Y. Wang, N. Woolsey, J. Zhang, X. Zhao, L. A. Gizzi. Investigation of ruling parameters on the growth of side and back stimulated Raman scattering in inhomogeneous plasmas at shock ignition laser intensity[J]. Matter and Radiation at Extremes, 2025, 10(4): 045401. doi: 10.1063/5.0257022

Citation:

G. Cristoforetti, E. Hume, S. Agarwal, D. Batani, M. Cervenak, P. Devi, R. Dudzak, D. Ettel, P. Gajdos, K. Glize, S. Jelinek, L. Juha, P. Koester, M. Krupka, M. Krus, H. Larreur, G. Malka, D. Mancelli, P. E. Masson-Laborde, A. Morace, Ph. Nicolai, O. Renner, D. Singappuli, S. Singh, M. Tatarakis, X. Yuan, Y. Wang, N. Woolsey, J. Zhang, X. Zhao, L. A. Gizzi. Investigation of ruling parameters on the growth of side and back stimulated Raman scattering in inhomogeneous plasmas at shock ignition laser intensity[J]. Matter and Radiation at Extremes, 2025, 10(4): 045401. doi: 10.1063/5.0257022

Citation:

G. Cristoforetti, E. Hume, S. Agarwal, D. Batani, M. Cervenak, P. Devi, R. Dudzak, D. Ettel, P. Gajdos, K. Glize, S. Jelinek, L. Juha, P. Koester, M. Krupka, M. Krus, H. Larreur, G. Malka, D. Mancelli, P. E. Masson-Laborde, A. Morace, Ph. Nicolai, O. Renner, D. Singappuli, S. Singh, M. Tatarakis, X. Yuan, Y. Wang, N. Woolsey, J. Zhang, X. Zhao, L. A. Gizzi. Investigation of ruling parameters on the growth of side and back stimulated Raman scattering in inhomogeneous plasmas at shock ignition laser intensity[J]. Matter and Radiation at Extremes, 2025, 10(4): 045401. doi: 10.1063/5.0257022

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Investigation of ruling parameters on the growth of side and back stimulated Raman scattering in inhomogeneous plasmas at shock ignition laser intensity

doi: 10.1063/5.0257022

G. Cristoforetti^{1
,
,
,},
E. Hume^1
,,
S. Agarwal^{2, 3
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D. Batani^4
,,
M. Cervenak^5
,,
P. Devi^{2, 3
,},
R. Dudzak^{2, 5
,},
D. Ettel^{2, 6
,},
P. Gajdos^5
,,
K. Glize^{7, 8, 9
,},
S. Jelinek^{2, 3, 5
,},
L. Juha^2
,,
P. Koester^1
,,
M. Krupka^{2, 5, 10
,},
M. Krus^5
,,
H. Larreur^{4, 11
,},
G. Malka^4
,,
D. Mancelli^{12, 13
,},
P. E. Masson-Laborde^{14, 15
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A. Morace²,
Ph. Nicolai^4
,,
O. Renner^{2, 5, 16
,},
D. Singappuli^4
,,
S. Singh^{2, 5, 17
,},
M. Tatarakis^{12, 13
,},
X. Yuan^{8, 9
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Y. Wang^{18
,},
N. Woolsey^{18
,},
J. Zhang^{8, 9, 19
,},
X. Zhao^{8, 9, 18},
L. A. Gizzi^1
,

1.
ILIL, CNR-INO, Pisa, Italy
2.
Institute of Physics of the CAS, Prague, Czech Republic
3.
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
4.
Université de Bordeaux, CNRS, CEA, CELIA, Talence 33405, France
5.
Institute of Plasma Physics of the CAS, Prague, Czech Republic
6.
Faculty of Mechatronics, Informatics and Interdisciplinary Studies, TUL, Liberec, Czech Republic
7.
Rutherford Appleton Lab, CLF, Didcot, United Kingdom
8.
Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, SJTU, Shanghai, China
9.
CICIFSA, SJTU, Shanghai, China
10.
Faculty of Nuclear Science and Physical Engineering, Czech Technical University, Prague, Czech Republic
11.
Departamento de Física fundamental, Facultad de Ciencias, Universidad de Salamanca, Salamanca, Spain
12.
Institute of Plasma Physics and Lasers-IPPL, University Research and Innovation Center, Hellenic Mediterranean University, Rethymno, Greece
13.
Department of Electronic Engineering, Hellenic Mediterranean University, Chania, Greece
14.
CEA, DAM, DIF, F-91297 Arpajon, France
15.
Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes, 91680 Bruyères-le-Châtel, France
16.
The Extreme Light Infrastructure ERIC, ELI Beamlines Facility, Dolni Brezany, Czech Republic
17.
Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic
18.
York Plasma Institute, University of York, York, United Kingdom
19.
Beijing National Laboratory for Condensed Matter Physics, IOP, CAS, Beijing, China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: gabriele.cristoforetti@cnr.it
Received Date: 2025-01-08
Accepted Date: 2025-05-31

Available Online: 2025-11-28

Publish Date: 2025-07-01

Abstract

Abstract

Recent experiments at the National Ignition Facility and theoretical modeling suggest that side stimulated Raman scattering (SSRS) instability could reduce laser–plasma coupling and generate considerable fluxes of suprathermal hot electrons under interaction conditions envisaged for direct-drive schemes for inertial confinement fusion. Nonetheless, SSRS remains to date one of the least understood parametric instabilities. Here, we report the first angularly and spectrally resolved measurements of scattered light at laser intensities relevant for the shock ignition scheme (I ∼ 10¹⁶ W/cm²), showing significant SSRS growth in the direction perpendicular to the laser polarization. Modification of the focal spot shape and orientation, obtained by using two different random phase plates, and of the density gradient of the plasma, by utilizing exploding foil targets of different thicknesses, clearly reveals a different dependence of backward SRS (BSRS) and SSRS on experimental parameters. While convective BSRS scales with plasma density scale length, as expected by linear theory, the growth of SSRS depends on the spot extension in the direction perpendicular to laser polarization. Our analysis therefore demonstrates that under current experimental conditions, with density scale lengths L_n ≈ 60–120 μm and spot sizes FWHM ≈ 40–100 μm, SSRS is limited by laser beam size rather than by the density scale length of the plasma.

Conflict of Interest
The authors have no conflicts to disclose.
G. Cristoforetti: Conceptualization (lead); Data curation (equal); Formal analysis (equal); Funding acquisition (lead); Investigation (equal); Project administration (lead); Resources (equal); Supervision (equal); Visualization (equal); Writing – original draft (equal); Writing – review & editing (equal). E. Hume: Data curation (equal); Formal analysis (equal); Investigation (equal); Visualization (equal); Writing – review & editing (equal). S. Agarwal: Data curation (equal); Formal analysis (equal); Investigation (equal); Resources (equal). D. Batani: Funding acquisition (equal); Supervision (equal); Visualization (equal); Writing – review & editing (equal). M. Cervenak: Data curation (equal); Investigation (equal); Resources (equal). P. Devi: Data curation (equal); Investigation (equal). R. Dudzak: Resources (equal). D. Ettel: Investigation (equal); Resources (equal). P. Gajdos: Investigation (equal); Resources (equal). K. Glize: Conceptualization (equal); Data curation (equal); Formal analysis (equal); Investigation (equal); Resources (equal); Writing – review & editing (equal). S. Jelinek: Data curation (equal); Formal analysis (equal); Investigation (equal). L. Juha: Funding acquisition (equal); Project administration (equal); Resources (equal); Supervision (equal). P. Koester: Conceptualization (equal); Data curation (equal); Investigation (equal); Supervision (equal); Writing – review & editing (equal). M. Krupka: Data curation (equal); Formal analysis (equal); Investigation (equal); Resources (equal). M. Krus: Funding acquisition (equal); Project administration (equal); Resources (equal); Supervision (equal). H. Larreur: Data curation (equal); Investigation (equal). G. Malka: Data curation (equal); Formal analysis (equal); Investigation (equal); Writing – review & editing (equal). D. Mancelli: Data curation (equal); Investigation (equal). P. E. Masson-Laborde: Formal analysis (equal); Software (equal). A. Morace: Resources (equal); Supervision (equal). Ph. Nicolai: Formal analysis (equal); Software (equal); Writing – review & editing (equal). O. Renner: Data curation (equal); Formal analysis (equal); Investigation (equal); Writing – review & editing (equal). D. Singappuli: Data curation (equal); Investigation (equal). S. Singh: Data curation (equal); Formal analysis (equal); Investigation (equal); Writing – review & editing (equal). M. Tatarakis: Formal analysis (equal); Supervision (equal). X. Yuan: Funding acquisition (equal); Supervision (equal). Y. Wang: Data curation (equal); Formal analysis (equal); Investigation (equal); Resources (equal). N. Woolsey: Formal analysis (equal); Resources (equal); Supervision (equal); Writing – review & editing (equal). J. Zhang: Funding acquisition (equal); Supervision (equal). X. Zhao: Data curation (equal); Formal analysis (equal); Investigation (equal); Resources (equal). L. A. Gizzi: Conceptualization (equal); Funding acquisition (equal); Project administration (equal); Resources (equal); Supervision (equal); Writing – review & editing (equal).
Author Contributions
The data that support the findings of this study are available from the corresponding author upon reasonable request.

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References(26)

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