Study of Intense Relativistic Electron Beam Modulation by Wakefield Effects PDF Download
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Author: J. Miller
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
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: J. Miller
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
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: Y. Y. Lau
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
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: M. Friedman
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
A novel method of auto-modulating an intense relativistic electron beam has been demonstrated. The modulation is accomplished by passing the electron beam through a series of cavities that are inserted into a conventional drift tube. Experimental results indicate that the current is modulated at a frequency of 500 MHz at a relative modulation amplitude exceeding 80%. (Author).
Author: Sidney Darwin Putnam
Publisher:
ISBN:
Category :
Languages : en
Pages : 504
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
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Book Description
Transverse to longitudinal phase space manipulation hold great promises, e.g., as a potential technique for repartitioning the emittances of a beam. A proof-of-principle experiment to demonstrate the exchange of a low longitudinal emittance with a larger transverse emittance is in preparation at the Argonne Wakefield Accelerator using a (almost equal to)12 MeV electron beam. In this paper we explore the limiting effects of this phase space manipulation method including high order and collective effects. A realistic start-to-end simulation of the planned proof-of-principle experiment including sensitivity studies is also presented.
Author: David Holder
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This thesis details the experimental studies leading to initial attempts to measure an interaction in free space between a short pulse of terahertz radiation (generated from a 40 fs, 800 nm titanium-sapphire (Ti:S) laser pulse) and bunches of medium-energy relativistic electrons within the ALICE accelerator. The work undertaken included optimization of the terahertz source itself, which is a large-area photoconductive antenna with high-voltage electrodes; the aim being to maximize the potential that can be applied before breakdown occurs. The key feature of such terahertz sources is the radially-polarized (TEM10-like) nature of the radiation generated. Further work included characterization of the temporal structure and transverse profile of the terahertz radiation pulse in the ALICE Diagnostics Room; duplication of this experimental arrangement inside the ALICE accelerator; modification of the operating parameters of ALICE to produce the most conductive situation for detecting an interaction. The final step was the installation of additional electron beam diagnostics and the experimental search for a definite interaction signal. The work described in this thesis is part of a project named ALICE Energy Modulation Induced by Terahertz Radiation, also known as AEMITR.
Author: A.V. Borovsky
Publisher: Springer Science & Business Media
ISBN: 9783540434467
Category : Medical
Languages : en
Pages : 238
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Book Description
For the first time in a book, this monograph describes relativistic and charge-displacement self-channelling, which is the major finding in the physics of superintense laser beams. It also presents general nonlinear models of lasers - plasma interactions specifically in the case of extremely high intensities.
Author: Joseph A. Gregor
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
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Book Description
Author: Patrick Gerard O'Shea
Publisher:
ISBN:
Category : Electron beams
Languages : en
Pages : 316
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Book Description
Author: Wesley O. Doggett
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
'Intense Relativistic Electron Beam Investigation', was reported in the 'Interim Scientific Report to the AFOSR for the period October 1, 1979 to September 30, 1980' and is herewith included by reference as part of this final report. Progress during the second (final) year of this contract is reported herein. In particular the following topics are discussed: (a) collective ion acceleration experiments using relativistic electron beams and localized ion sources produced by thin films, filaments, puffed gases and vaporization of small diameter wires; and (b) electron beam quality studies experiments in collaboration with Drs. Robert K. Parker and V.L. Granatstein at the Naval Research Laboratory with the objective of obtaining 'cool' beams propagating in vacuum in an axial magnetic field obtaining 'cool' beams propagating in vacuum in an axial magnetic field with minimum energy spread for such applications as the free electron laser.
