نتایج جستجو برای: overdense plasma
تعداد نتایج: 354705 فیلتر نتایج به سال:
für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...
Experimental and theoretical investigation of whistler waves produced in the interaction of a density modulated electron beam with a magnetized plasma are presented for the conditions of active space experiments in the Earth ionosphere as well as for the case of overdense laboratory plasmas. Structures of the electromagnetic fields far and near the beam, efficiency of the beam modulation, emitt...
We review recent PIC simulation results which show that double-sided irradiaton of a thin overdense plasma slab by ultra-intense laser pulses from both sides can lead to sustained comoving acceleration of surface electrons to energies much higher than the conventional ponderomotive limit. The acceleration stops only when the electrons drift transversely out of the laser beam. We show results of...
An extended thermal particle boundary condition is devised to more efficiently and accurately model laser–plasma interactions in overdense plasmas. Particle-in-cell simulations of such require many particles per cell, a large region background plasma often necessary correctly mimic semi-infinite avoid electron refluxing from truncated plasma. For long-pulse lasers picoseconds, constraints can b...
Electron Bernstein waves (EBW) are suitable for heating, current drive, and radiation temperature measurements of overdense plasma, ωpe>>ωce , in spherical torus devices. In NSTX, design of a multi-megawatt EBW current drive system is supported by experimental measurements and computations of obliquely viewing, dual-polarization EBW emission (EBE) radiometry. Efficient EBW coupling, 80±20% at 1...
The theory of electromagnetically induced transparency (EIT) in a plasma [1] is examined in the context of a bounded system via particle simulations. It is found that when boundaries are introduced into the problem, the requirements of causality preclude the transmission of radiation through an overdense plasma as conceived in the original theory. However, a two-frequency laser, or “beatwave”, ...
An overdense plasma layer irradiated by intense light can exhibit dramatic nonlinear-optical effects due to a relativistic mass-effect of free electrons: highly-multiple hysteresises of reflection and transition, and emergence of immobile waves of large amplitude. Those are trapped quasi-soliton spikes sustained by a weak pumping having a tiny fraction of their peak intensity once they have bee...
The mechanism of harmonic generation in both O and X-mode configurations for a magnetized plasma has been explored here detail with the help Particle-In-Cell (PIC) simulations. A detailed characterization reflected transmitted electromagnetic radiation propagating bulk carried out this purpose. efficiency is shown to increase incident laser intensity. Dependency also found on magnetic field str...
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