[en] It is shown in the quasiclassical approximation that the off-shell supermultiplets of the Supersymmetric Bag Model can be constructed merely according to the 'intuitive rule' (changing a creation operator into its supersymmetric partner). We also demonstrate how to form the candidate on-shell supermultiplets to be used as the trial state vectors for the variational method. The energy expression for an on-shell supermultiplet (a set of composite particles) of the model is given. (orig.)

[en] The interaction of ultrahigh intensity laser with overdense plasma is studied using a 2.5D particle simulation code. A channel is formed due to the extremely large ponderomotive force associated with laser pulse. Strong self-generated magnetic fields produced by strong flow of high-energy electrons are observed. Three kinds of spatial profiles of laser intensity are used to investigate the effect of laser spatial profile on boring , and it is found that the boring effect is stronger when the radial gradient of laser intensity is bigger. Odd and even harmonics are found in reflected waves

[en] The anomalous skin effect of ultra-short laser pulse on plasma heating is studied using a two-dimensional multi-time-scale fully electromagnetic relativistic particle simulation code. Reasonable physical description is undertaken

[en] Wave breaking due to resonant absorption in plasmas produced by the laser beam is studied using theoretical analysis and particle simulation of plasma. The temperature effects on wave breaking and resonant absorption are also considered. It is indicated that those electrons in the resonant region are not only oscillating heated, but also accelerated by Landau damping. There exists a turbulence acceleration mechanism in underdense plasma region. Second wave breaking can also be observed in certain power density of laser light

[en] Resonant absorption of a P-polarized laser light, which obliquely incidents on an inhomogeneous plasma slab with a linear density profile, is simulated by a 2-D multi-time-scale electromagnetic relativistic particle simulation code. Structure of self-consistent field and density profile of plasma in the corona are presented. Excitation of plasma wave, steepening of density profile and the production of cavitations are observed by numerical simulation

[en] The propagation of a laser pulse with a peak intensity 10¹⁹ W/cm² through the preformed underdense plasma with the density 0.014 n_c are studied by using two-dimensional particle-in-cell simulations. The longitudinal electron heating is identified and verified, and its major property agrees with the theoretical prediction. The electron distributions in phase space, patterns of the electric fields, profiles of the ion or electron density and other plasma nonlinear phenomena are presented and discussed

[en] The transport of a relativistic electron beam in dense plasmas with a cold return electron current is examined by two-dimensional particle-in-cell simulation. The filamentation and coalescence of currents and related magnetic field patterns, caused by the electromagnetic-beam-plasma instability, are observed. In the later simulation time, the electrons of the relativistic electron beam are trapped into the potential wells of the wave excited by the instability, and transport resonantly with the wave

[en] The detailed process of bubble generation in laser-plasma interaction has been studied by particle simulation. During the interaction between laser and plasma, a strong electrostatic field caused by charge separation is observed, whose structure looks like a potential well. Electrons are accelerated to 10 MeV within some tens of femto-seconds when the laser intensity is 5 x 10¹⁸ W/cm². After many electrons escape from the potential-well-like structure, electron cavitons are generated. Because of laser filamentation, the intensity of the laser becomes very asymmetric, the caviton structure is squeezed and deformed, and then electron bubbles are generated, which finally results in ion bubble formation. It is the electron caviton and laser beam filamentation that cause bubble generation. The 10 MeV superthermal electron generation accompanied by the electron caviton is attributed to E∇·E heating, which is a locally oscillating electron heating mechanism

[en] 2-D particle simulation is used to investigated the ultra-powerful laser plasma interaction. The mechanism of J x B heating is discussed briefly. Results of particle simulation indicate electron heating and its character

[en] In order to offset the collisional effects reduced by using finite-size particles, β particle clouds are used in particle simulation codes (β is the ratio of charge or mass of modeling particles to real ones). The method of impulse approximation (strait line orbit approximation) is used to analyze the scattering cross section of β particle clouds plasmas. The authors can obtain the relation of the value of a and β and scattering cross section (a is the radius of β particle cloud). By using this relation the authors can determine the value of a and β so that the collisional effects of the modeling system is correspondent with the real one. The authors can also adjust the values of a and β so that the authors can enhance or reduce the collisional effects fictitiously. The results of simulation are in good agreement with the theoretical ones