Title: Study of nonlinear kinetic effects in Stimulated Raman Scattering using semiLagrangian Vlasov codes
1Study of nonlinear kinetic effects in Stimulated
Raman Scattering using semi-Lagrangian Vlasov
codes
- Alain Ghizzo1, P. Bertrand1, T.W. Johnston2,
- M. Albrecht-Marc1,T. Reveillé1
- 1. LPMIA, CNRS-UMR7040, Université Henri
Poincaré, Nancy, - BP 239, F-54506 Vandoeuvre, France
- 2. I.N.R.S. Energie et Matériaux, Varennes,
Québec - Alain.Ghizzo_at_lpmi.uhp-nancy.fr
2Topics
- Vlasov plasmas
- Vlasov codes and PIC codes
- Application I Resonant wave particle interaction
- Application II SRS-B in optical mixing
- Conclusions
3Topics
- Vlasov plasmas
- Vlasov codes and PIC codes
- Application I Resonant wave particle interaction
- Application II SRS-B in optical mixing
- Conclusions
4Introduction
- . Vlasov models have long been used to study
collisionless plasmas. - Vlasov codes powerful tool for studying in
details the particle dynamics due to very fine
resolution in phase space. - Questions for applications
- Need for a kinetic model?
- PIC or Vlasov simulation?
5Vlasov plasmas collective effects
6Topics
- Vlasov plasmas
- Vlasov codes and PIC codes
- Application I Resonant wave particle interaction
- Application II SRS-B in optical mixing
- Conclusions
7Comparison PIC-Vlasov (1)
8Comparison PIC-Vlasov (2)
9Comparison PIC-Vlasov (3)
Prefer PIC
Prefer Vlasov
10Topics
- Vlasov plasmas
- Vlasov codes and PIC codes
- Application I Resonant wave particle interaction
- Application II SRS-B in optical mixing
- Conclusions
11Stimulated Raman Scattering
12SRS 3 mode coupling
13Three mode coupling a fluid description
14Three mode coupling a fluid description
15Three mode coupling a fluid description
16Time evolution pump scattered
Check the fluid predictions against a fully
kinetic Vlasov simulation
17Time evolution pump plasma
Poor Conservation !
18Phase space portraits (1)
19Phase space portraits (2)
20Phase space portraits (3)
21Accounting for non fluid particles
22Topics
- Vlasov plasmas
- Vlasov codes and PIC codes
- Application I Resonant wave particle interaction
- Application II SRS-B in optical mixing
- Conclusions
23SRS-B in the kinetic regime (1)
- SRS-B reflectivity presents a bursting behavior
- Nonlinear frequency shift - G.J. Morales and T.M.
ONeil, PRL 28, 417 (1972) -
24SRS-B in the kinetic regime (2)
25Topics
- Vlasov plasmas
- Vlasov codes and PIC codes
- Application I Resonant wave particle interaction
- Application II SRS-B in optical mixing
- Conclusions
26Conclusions
- Vlasov codes as compared to PIC codes
- lack of numerical noise
- good resolution in phase space
- provided the dimension of velocity space is as
low as possible. - Kinetic effects in plasmas allow more phenomena
than are found using only fluid theory with ad
hoc kinetic damping.