kinetic waves induced by electron trapping in stimulated
TRANSCRIPT
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0Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Kinetic waves induced byelectron trapping in
Stimulated Raman Scatteringin laser-plasma interaction
Alain Ghizzo1, D. Del Sarto, M. Sarrat, P. Bertrand
Institut Jean Lamour- UMR 7198- Université de Lorraine, Nancy, France
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1Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Topics
1.1. Vlasov Vlasov plasmasplasmas
2. Electrostatic case: KEEN waves driven byan external ponderomotive force
3. Electromagnetic case: SRS-B in thekinetic regime
4. Conclusions
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2Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Vlasov-Maxwell system (1)
Numerical resolution of the Liouville’s equation (alsocalled Vlasov or Boltzmann’s equation with collosionterm)
Its numerical integration is a real challenge in plasmaphysics.
!
DfDt
="f"t
+dxdt.# x f +
dpdt.# p f = 0
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3Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Vlasov-Maxwell system (2)
Vlasov equation
Maxwell equations!
"f"t
+pm#.$ x f + E+
pm#
%B&
' (
)
* + .$ p f = 0
!
rotE = "#B#t
!
rotB = µ0J+"Ec2"t
!
divE ="#0
!
divB = 0
Source terms:
!
J =pm"
fd 3### p
!
" = fd 3### p
!
" = 1+p2
m2c2
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4Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Direct attack: Semi-Lagrangian Solvers
Vlasov codes: based on
the resolution of f alongthe characteristics(Newton’s laws)
the interpolation of f ongrid points by cubicsplines
E. Sonnendrucker, J. Roche, P. Bertrand, A. Ghizzo, JCP. 149, 201 (1999).
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5Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Topics
1.1. Vlasov Vlasov plasmasplasmas
2. Electrostatic case: KEEN waves driven byan external ponderomotive force
3. Electromagnetic case: SRS-B in thekinetic regime
4. Conclusions
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6Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Montgomery et al.’s PRL :Experimental observation of Trapped Electron Acoustic
Waves (TEAW),a class of Kinetic Electrostatic Electron Nonlinear
(KEEN) waves
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7Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Kinetic Electrostatic Electron Nonlinear(KEEN) waves (3)
Bernstein- Greene-Kruskal (BGK)waves are solution of thestationary Vlasov-Poissonsystem
BGK are self-sustained solutionscharacterized by hole in thephase space. Phase space holesbehave as quasi-particles
BGK are ideal nonlinear solutions,not always accessible to realsituations, their emergencefrom a homogeneous plasma isnot explained
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8Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
KEEN waves driven near the “Soft” Threshold.Dilemma: To Decay or to Form Phase Space
Vortices?Max PF = 0.017
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9Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
KEEN wavess, Driven somewhatOver their “Soft” Threshold, (e.g. 2x)
Show Resurgence, but then Hobble & Barely Survive
Signals from midpoint of box.
F(x,v) at T=150
(Max PF here is 0.030)
T.W. Johnston, Y. Tyshetskly, A. Ghizzo, P. Bertrand, Physics of Plasmas 16 (4) 042105(2009).
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10Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
KEEN waves: emergence of self-sustained holes
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11Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Topics
1.1. Vlasov Vlasov plasmasplasmas
2. Electrostatic case: KEEN waves driven byan external ponderomotive force
3. Electromagnetic case: SRS-B in thekinetic regime
4. Conclusions
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12Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS- B : 3 mode coupling
Vacuum PLASMAScattered wave (1)
Plasma wave (2)
LASERPump wave (0)
Quasi particles (photons, plasmons)Energy conservation
Momentum conservation
Electron plasma in a fixed ion homogeneous background
!
"0 k0( ) ="1 k1( ) +"2 k2( )
!
k0 = k1 + k2
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13Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS-B in the « kinetic » regime (2)
vacuum vacuumplasma
no
L
Lp
parabolic density profile
pump wave (λ0, 3ω)
Initial conditions
Numerical parameters :• λ0 = 1/3 (1.06)µm ≈ 0.353µm / λs= 1/2 (1.06)µm = 0.53µm
• ω0-1 ≈ 2.10-16s = 0.2fs
• Plasma length : 640 λ0 ≈ 230µm
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SRS-B in the « kinetic » regime (3)
• SRS-B reflectivitypresents a burstingbehavior
!
"0 ="s +"epw1 = 2 / 3+1/3k0 = # ks + kepw0.957 = #0.60+1.559
• Nonlinear frequencyshift - G.J. Morales andT.M. O’Neil, PRL 28, 417(1972) -
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15Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS-B in the kinetic regime (4)
After a fluid-like phase,kinetic effects induce abursting behaviour inboth scattered andplasma modes
ωs≈0.666
0.689
ωs≈0.75~
E- reflected ω-spectrum
M. Albrecht-marc, A. Ghizzo et al,Phys Plasmas 14, 072704 (2007).
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16Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS-B in the kinetic regime (5)
• Burstingbehavior inthe timeevolution ofthe electrondensity
0.29 (SRFS)
ωe≈0.249~
ωe≈0.333
ne ω-spectrum
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17Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS-B in the « kinetic » regime (6)• Maintain of SRS-B
resonance
!
"0 ="s ˜ k s( ) +"epw #$"
k0 = # ˜ k s + kepw +$k
!
˜ " s ="s ks( )#$k%"%k& ' (
) * + ks
˜ " s ="s #$kvgs
• Raman rescatteringinstability involving KEENwaves and SRS-Fscattered light
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18Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS-B in the « kinetic » regime (7)
• Langmuir waveinduced bySRS-B process
• Vortex-mergingleading to weakturbulence
• BGK-like self-sustained structures(persisting over along time)
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19Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
SRS-B : Diagnostics of moving windows
We follow the sameparticle population (thewindow moves at thelinear phase velocity)
Vortex-merging leading toweak turbulence
BGK-like self-sustainedstructures (persistingover a long time)
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20Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Topics
1.1. Vlasov Vlasov plasmasplasmas
2. Electrostatic case: KEEN waves driven byan external ponderomotive force
3. Electromagnetic case: SRS-B in thekinetic regime
4. Conclusions
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21Atomic and Nuclear Physics, 2017 Nov. 08-09 Las Vegas, USA
Conclusions
Kinetic effects are dominated by trapped particlesleading to phase space holes which suppress the Landaudamping
Kinetic effects in plasmas allow more phenomena thanare found using only fluid theory with « ad hoc » kineticdamping.
Vlasov code are adapted to study parametricinstabilities (SRS, SBS) in the new « kinetic » regime inlaser-plasma interaction