Characterization of laser wakefield generated betatron X-ray radiation using grazing incidence mirror reflection
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Betatron
Transition radiation
Reflection
The techniques of normal form analysis, well known in the literature, can be used to provide a straightforward characterization of linear betatron dynamics in a coupled lattice. Here, we consider both the beam distribution and the betatron oscillations in a storage ring, assuming that the beam emittances and betatron actions respectively are provided as parameters. We find that the beta functions for uncoupled motion generalize in a simple way to the coupled case. Defined in the way that we propose, the beta functions remain well behaved (positive and finite) under all circumstances, and have essentially the same physical significance for the beam size and betatron oscillations as in the uncoupled case. We discuss a technique for making direct measurements of the ratio of the coupled lattice functions at different points in the lattice.
Betatron
Lattice (music)
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Betatron
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Abstract A detailed comparison is made of the Kumakhov radiation with the coherent bremsstrahlung, the transition radiation and the synchroton radiation. The coherent bremsstrahlung was shown to be suppressed under channeling conditions. It was found that the mechanism of the appearance of the Kumakhov radiation differs greatly from that for the coherent bremsstrahlung and the transition radiation. The Kumakhov radiation was shown to be more intensive than the synchrotron radiation, especially in the region of high-energy quanta.
Transition radiation
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Betatron
Proton Synchrotron
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Generation of ultra-short betatron x-rays by laser-accelerated electron beams is of great research interest as it has many applications. In this paper, we propose a scheme for obtaining bright betatron x-rays by applying external wiggler magnetic field in the laser wakefield to resonantly drive the betatron oscillations of the accelerated electrons therein. This results in a significant enhancement of the betatron oscillation amplitude and generation of bright x-rays with high photon energy. The scheme is demonstrated using two-dimensional particle-in-cell simulation and discussed using a simple analytical model.
Betatron
Wiggler
Oscillation (cell signaling)
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It is assumed that the electron charge accelerated in small-size betatons is of the same order as that in the classical betatron. However, the parameters of the interpolar space of small-size betatons significantly differ from the parameters of the classical betatron. We can expect that the value of the accelerated electron charge will be different. The paper presents the results of the measurements of the electron charge accelerated in a small-size betatron MIB-4. It is shown that the electron charge accelerated is this betatron is larger than that in the classical betatron.
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The betatron is a very important instrument to impart high energy to light charged particles such as electrons. In this paper, we propose two optimal ideas to improve the efficiency of the original betatron application. With our approaches, the efficiency of betatron could be improved to nearly 100%. And the current density of the electron beam can also be improved obviously.
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Attempts to formulate an analysis of electron capture in the betatron have not been successful because there has been no single point of view as to the mechanism of betatron capture. To delineate the capture mechanism and to acquire the necessary information for formulating an analysis of capture, an experimental investigation was made on the effects which occur in a betatron during injection and in the initial stages of acceleration. Studies were made of the dependence of electron capture efficiency on various injection parameters: duration of the starting period, pulse amplitude, amd time of injection. In addition the effect of varying the frequency of the betatron magnetic field and the effect on the injection process of introducing additional space charge into the chamber and other changes in starting conditions were experimentally investigated. The experiments were made using a 3-Mev betatron especially designed for this purpose. (J.S.R.)
Betatron
Pulse duration
Electron capture
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The shapes of submillimeter long electron bunches at the Cornell linear accelerator have been determined by measuring the coherent far-ir synchrotron and transition radiation spectrum produced by the charge distribution. With the aid of a Kramers-Kronig analysis of the spectral data, we show that the longitudinal bunch shape including the asymmetry can be accurately determined.
Transition radiation
Bunches
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