نتایج جستجو برای: relativistic electron beam
تعداد نتایج: 428847 فیلتر نتایج به سال:
Generation of submillimeter radiation by stimulated Raman scattering in an intense relativistic electron beam subjected to a spatially periodic transverse electric field is examined. The requisite electric field modulation can be obtained by rippling the wall of the conducting drift tube. When the electron beam is subjected to a periodic longitudinal electric field, short wavelength plasmons, r...
We report an experimental observation suggesting plasma channel formation by focusing a relativistic laser pulse into a long-scale-length preformed plasma. The channel direction coincides with the laser axis. Laser light transmittance measurement indicates laser channeling into the high-density plasma with relativistic self-focusing. A three-dimensional particle-in-cell simulation reproduces th...
Microwave reflection is observed on a relativistic electron beam front propagating into a gas filled waveguide. The frequency conversion from the incident X band electromagnetic waves and the reflected Kd band signal is consistent with the value of the beam front velocity measured from time of flight using B03B8 probes. The reflection is found to occur during the current rise time. LE JOURNAL D...
Self-focusing of an intense optical beam in a plasma is studied, including the nonlinear effects of both the relativistic electron mass and the ponderomotive potential due to the electromagnetic wave. An exact steady-state asymptotic solution of beam propagation in a localized solitary waveform is obtained in slab geometry. Amplitude-width scaling relations are obtained, which imply that the wi...
We developed an exact analytical treatment for space-charge waves within a relativistic electron beam in terms of (self-reproducing) propagating eigenmodes. This result is of obvious theoretical relevance as it constitutes one of the few exact solution for the evolution of charged particles under the action of self-interactions. It also has clear numerical applications in particle accelerator p...
Tunable, monochromatic x-rays have been generated in the Laser Synchrotron Source (LSS) experiment at the Naval Research Laboratory by Thomson backscattering of laser photons from a relativistic electron beam. Laser photons from a 5 J, 10 nsec, Nd:glass laser at 1053 nm wavelength are backscattered from a 4 MeV, 300 mA electron beam generated by an S-band RF gun. Recent experimental results inc...
Single-cycle terahertz fields generated by coherent transition radiation from a relativistic electron beam are used to study the high field optical response of single crystal GaAs. Large amplitude changes in the sub-band-gap optical absorption are induced and probed dynamically by measuring the absorption of a broad-band optical beam generated by transition radiation from the same electron bunc...
Microbunching of a relativistic electron beam into a helix is examined analytically and in simulation. Helical microbunching is shown to occur naturally when an e beam interacts resonantly at the harmonics of the combined field of a helical magnetic undulator and an axisymmetric input laser beam. This type of interaction is proposed as a method to generate a strongly prebunched e beam for coher...
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