Electron acoustic waves (EAW) with a phase velocity less than twice the plasma thermal velocity are observed on pure ion plasma columns. At low excitation amplitudes, the EAW frequencies agree with theory, but at moderate excitation the EAW is more frequency variable than typical Langmuir waves, and at large excitations resonance is observed over a broad range. Laser induced fluorescence measur...

We compare, in an extensive and systematic way, linear theory results obtained with the hybrid (ion kinetic and electron fluid), the gyrokinetic and the fully kinetic plasma models. We present a test case with parameters that are relevant for solar wind turbulence at small scales, which is a topic now recognized to need a kinetic treatment, to a certain extent. We comment on the comparison of l...

Motivated by recent discussions on the possible role of quantum computation in plasma simulations, here we present different approaches to Koopman's Hilbert-space formulation classical mechanics context Vlasov-Maxwell kinetic theory. The celebrated Koopman-von Neumann construction is provided with two Hamiltonian structures: one canonical and recovers usual Clebsch representation Vlasov density...

We investigate rescaling transformations for the Vlasov-Poisson and Euler-Poisson systems and derive in the plasma physics case Lyapunov functionals which can be used to analyze dispersion eeects. The method is also used for studying the long time behaviour of the solutions and can be applied to other models in kinetic theory (2-dimensional symmetric Vlasov-Poisson system with an external magne...

A kinetic theory for radiation interacting with sound waves in an ultrarelativistic electron–positron plasma is developed. It is shown that the effect of a spatial spectral broadening of the electromagnetic pulse is to introduce a reduction of the growth rates for the decay and modulational instabilities. Such spectral broadening could be due to a finite pulse coherence length, or through the u...

The importance of plasma momentum fluxes in fusion reactor divertor operation is noted. Direct measurements have been made of the momentum flux from magnetized He, Ne, AI and Kr plasmas onto solid carbon targets oriented normal to the magnetic field, as the target bias was varied between 50 and + 40 volts. The inferred ion energies are compared with fluid sheath theory. Corrections due to kinet...