High Power Laser Science and Engineering, Volume. 7, Issue 1, 010000e3(2019)
Dynamic stabilization of plasma instability
Fig. 1. An example concept of feedback control. (a) At
Fig. 2. Kapitza’s pendulum, which can be stabilized by applying an additional strong and rapid acceleration
Fig. 3. Superposition of perturbations defined by the wobbling driver beam. At each time the wobbler provides a perturbation, whose amplitude and phase are defined by the wobbler itself. If the system is unstable, each perturbation is a source of instability. At a certain time the overall perturbation is the superposition of the growing perturbations. The superimposed perturbation growth is mitigated by the beam wobbling motion.
Fig. 4. Example simulation results for the Rayleigh–Taylor instability (RTI) mitigation.
Fig. 5. Fluid simulation results for the RTI mitigation for the time-dependent
Fig. 6. Fluid simulation results for the RTI mitigation for the time-dependent wobbling frequency
Fig. 7. Fluid simulation results for the RTI mitigation for the time-dependent wobbling wavelength
Fig. 8. Filamentation instability. In this case an electron beam has a density perturbation in the transverse direction, and is injected into a plasma. In the plasma return current is induced to compensate for the electron beam current. The perturbed electron beam itself defines the filamentation instability phase, and the e-beam axis oscillates in the
Fig. 9. Dynamic stabilization mechanism for the filamentation instability. (a) A modulated electron beam is imposed to induce the filamentation instability. The electron beam axis is wobbled or oscillates transversally with its frequency of
Fig. 10. Filamentation instability simulation results without and with the electron beam oscillation. The current density
Fig. 11. Magnetic field
Fig. 12. Histories of the normalized magnetic field energy
Fig. 13. 3D PIC simulation results for the filamentation instability growth at (a)
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S. Kawata, T. Karino, Y. J. Gu. Dynamic stabilization of plasma instability[J]. High Power Laser Science and Engineering, 2019, 7(1): 010000e3
Special Issue: HIGH ENERGY DENSITY PHYSICS AND HIGH POWER LASERS 2018
Received: Jul. 30, 2018
Accepted: Nov. 13, 2018
Posted: Nov. 14, 2018
Published Online: Jan. 16, 2019
The Author Email: S. Kawata (kwt@cc.utsunomiya-u.ac.jp)