Author: Y. Y. Lau
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ISBN:
Category :
Languages : en
Pages : 35
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The space charge wave and the stability of an intense annular electron beam propagating in a metallic pipe is examined. It is shown that the beam can propagate stably in the parameter regime of some proposed experiments where such a beam is used to generate an electromagnetic wake for particle acceleration. Modulation of an intense beam with a large diameter appears promising at high frequencies. Keywords: Wakefield acceleration; Intense relativistic electron beams; Electron beam modulation.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 544
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 566
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Author: J. Krall
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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A time dependent, fully electromagnetic particle code is used to simulate transfer of energy from an annular modulated intense relativistic electron beam to a low current electron beam via a disk-loaded structure. It is shown that an intense beam may be used to drive such an accelerator at high transformer ratio (R 10) to obtain accelerating gradients in the about 100 Mv/m range, with power excess of 1 GW transferred from the primary to the secondary beam. Keywords: Particle accelerators; Compact accelerators; Particle simulations; Intense relativistic electron beams. (JHD).
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Category :
Languages : en
Pages :
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During the past several years there has been an increasing interest in using wakefield acceleration techniques as a means for achieving TeV energies with the next generation of linear colliders. The principal design goals for a wakefield accelerator that is to be sued in this context are high accelerating gradients and large transformer ratios. Fundamentally any slow wave structure can function as a wakefield accelerator, and several interesting concepts have been proposed. In this paper we consider for the slow wave structure a dielectrically loaded waveguide. The Dielectric Wakefield Accelerator is a very simple device. The geometry consists of a gapless cavity filled with a dielectric. The dielectric may fill all or just part of the cavity. Here we investigate driving the system with an intense annular beam, so the dielectric is separated from the wall by a vacuum region in which this beam is propagated. The primary advantage of driving with an annular beam is that larger currents can be achieved, and thus larger accelerating gradients can be generated. The drive beam is stabilized by a strong, axial magnetic field. The wall is coated with a dielectric liner to provide for better coupling. A small hole is drilled in the center of the dielectric to allow for the passage of a low current, witness beam.
Author: University of Wisconsin--Madison. Department of Electrical and Computer Engineering
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ISBN:
Category : Computer engineering
Languages : en
Pages : 500
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Author:
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1262
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Author: J. Miller
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Category :
Languages : en
Pages : 20
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An experimental study has been undertaken in order to investigate plasma wakefield effects produced in intense electron beam propagation in a background plasma. A 2 MeV, 1 kA, electron beam is used for this experiment. A 50 cm diam., 3.6 m long drift tube is filled with a background gas, typically trimethylamine (TMA). This gas is ionized by electrons emitted from heated tungsten filaments which are biased at approximately -100 Volts. The resultant plasma density is fairly uniform and is adjustable in the range 10 to the 8th power to 5 x 10 to the 9th power per cubic cm. A higher density Ion Focused Regime (IFR) channel for electron beam propagation is generated by KrF-laser (248 nm) ionization of the background TMA gas. The intense electron beam propagating on an IFR channel in this background plasma experiences wakefield effects due to the natural oscillations of the background plasma which are excited by the beam current risetime. The Ez component of the induced field is responsible for producing beam current modulation near the background plasma frequency. The results scale with plasma density as expected and current modulation is nearly complete for a certain parameter range. This technique may be amenable to a high power microwave generation technique analogous to the relativistic klystron. Detailed experimental results of beam modulation will be presented.
Author:
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1260
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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1362
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