نتایج جستجو برای: overdense plasma
تعداد نتایج: 354705 فیلتر نتایج به سال:
it has been shown that, in overdense plasmas of the type encountered in spherical tori, electron Bernstein waves can be excited in a plasma by mode conversion of either an externally launched X mode or an O mode. The electron Bernstein waves are strongly absorbed by electrons in the region where the wave frequency matches the Doppler broadened electron cyclotron resonance frequency or its harmo...
Focusing of a 15 MeV, 16 nC electron bunch by a gaussian underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated. The strong 1.9 cm focal length plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. Analysis of the beam envelope evolution observed near the beam waist show...
We present evidence for a skewed distribution of UV Fe ii emission in quasars within candidate overdense regions spanning spatial scales of ∼ 50 Mpc at 1.11 < z < 1.67, compared to quasars in field environments at comparable redshifts. The overdense regions have an excess of high equivalent width sources (W2400 > 42 Å), and a dearth of low equivalent width sources. There are various possible ex...
Theoretical studies and computer simulations predict efficient generation of attosecond electromagnetic pulses from overdense plasma targets, driven by relativistically strong laser pulses. These predictions need to be validated in time resolved experiments in order to provide a route for applications. The first available femtosecond sources for these experiments are likely to be 10 fs pulses o...
According to the standard scenario of plasma emission, escaping radiations are generated by nonlinear development kinetic bump-on-tail instability driven a single beam energetic electrons interacting with plasmas. Here we conduct fully-kinetic electromagnetic particle-in-cell simulations investigate emission induced ring-distributed overdense Efficient excitations fundamental (F) and harmonic (...
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