scholarly journals Laser wake field acceleration with controlled self-injection by sharp density transition

2004 ◽  
Vol 22 (4) ◽  
pp. 423-429 ◽  
Author(s):  
P. TOMASSINI ◽  
M. GALIMBERTI ◽  
A. GIULIETTI ◽  
D. GIULIETTI ◽  
L.A. GIZZI ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Plasma Density ◽  
Electron Bunch ◽  
Energetic Particles ◽  
Energy Spread ◽  
Promising Method ◽  
Acceleration Phase ◽  
Wake Field ◽  
Electron Bunches ◽  
Thin Foils

Laser Wake Field Acceleration of relativistic electron bunches is a promising method to produce a large amount of energetic particles with table top equipment. One of the possible methods to inject particles in the appropriate acceleration phase of the wake behind the pulse takes advantage of the partial longitudinal breaking of the wake crests across a density downramp. In this paper results of 2.5D PIC simulations, showing the production of an electron bunch with reduced energy spread, are reported. Also, a possible method to produce the required plasma density transition by laser explosion of a suitable couple of thin foils is discussed.

scholarly journals INCREASE OF EFFICIENCY OF ACCELERATION OF THE TEST ELECTRON BUNCH BY SEQUENCE OF ELECTRON BUNCHES IN THE RECTANGULAR DIELECTRIC RESONATOR AT PLASMA FILLING

2019 ◽  
pp. 53-57
Author(s):  
P.I. Markov ◽  
I.N. Onishchenko ◽  
G.V. Sotnikov
Keyword(s):  
Numerical Simulation ◽  
Electric Field ◽  
Relativistic Electron ◽  
Plasma Density ◽  
Dielectric Resonator ◽  
Electron Bunch ◽  
Linear Growth ◽  
Energy Gain ◽  
Electron Bunches ◽  
Test Electron

A result of numerical simulation of acceleration of the test electron bunch following a sequence of relativistic electron bunches in the rectangular dielectric resonator when filling the drift channel with plasma of different density is provided. We have found out that at change of plasma density the linear growth of energy gain of test bunch electrons is observed. It is connected with structure ordering of longitudinal accelerating electric field in the resonator and also with increase in its amplitude. It is due to that at periodic injection of drive bunches on resonator axis the areas with the increased plasma electrons density are formed.

scholarly journals Plasma wake-field excitation by relativistic electron bunches and charged particle acceleration in the presence of external magnetic field

2001 ◽  
Vol 19 (4) ◽  
pp. 597-604 ◽  
Author(s):  
V.A. BALAKIREV ◽  
V.I. KARAS' ◽  
I.V. KARAS' ◽  
V.D. LEVCHENKO
Keyword(s):  
Magnetic Field ◽  
Relativistic Electron ◽  
Magnetoactive Plasma ◽  
High Amplitude ◽  
Plasma Dynamics ◽  
Wake Field ◽  
Electron Bunches ◽  
Plasma Bunch ◽  
Field Excitation ◽  
Wake Fields

High-amplitude plasma wake waves are excited by high-density relativistic electron bunches (REB) moving in a plasma. The wake-fields can be used to accelerate charged particles, to serve as electrostatic wigglers in plasma free-electron lasers (FEL), and also can find many other applications. The electromagnetic fields in the region occupied by the bunch control the dynamics of the bunch itself. This paper presents the results of 2.5-dimensional numerical simulation of the modulation of a long REB in a plasma, the excitation of wake-fields by bunches in a plasma, in particular, in magnetoactive plasma. The previous one-dimensional study has shown that the density-profile modulation of a long bunch moving in plasma results in the growth of the coherent wake-wave amplitude. The bunch modulation occurs at the plasma frequency. The present study is concerned with the REB motion, taking into account the plasma and REB nonlinearities. It is demonstrated that the nonlinear REB/plasma dynamics exerts primary effect on both the REB self-modulation and the wake-field excitation by the bunches formed. We have demonstrated that a multiple excess of the accelerated bunch energy εmax over the energy of the exciting REB is possible in a magnetoactive plasma for a certain relationship between the parameters of the “plasma–bunch–magnetic field” system (owing to a hybrid volume–surface character of REB-excited wake-fields).

scholarly journals Electron bunch injection at an angle into a laser wakefield

2009 ◽  
Vol 27 (1) ◽  
pp. 69-77 ◽  
Author(s):  
M.J.H. Luttikhof ◽  
A.G. Khachatryan ◽  
F.A. van Goor ◽  
K.-J. Boller ◽  
P. Mora
Keyword(s):  
Laser Pulse ◽  
Electron Bunch ◽  
Extensive Study ◽  
Energy Spread ◽  
Pulse Dynamics ◽  
Electron Bunches ◽  
Vacuum Plasma ◽  
Laser Wakefield ◽  
External Injection ◽  
Wakefield Accelerator

AbstractExternal injection of electron bunches longer than the plasma wavelength in a laser wakefield accelerator can lead to the generation of femtosecond ultra relativistic bunches with a couple of percent energy spread. Extensive study has been done on external electron bunch (e.g., one generated by a photo-cathode RF linac) injection in a laser wakefield for different configurations.In this paper, we investigate a new way of external injection where the electron bunch is injected at a small angle into the wakefield. This way one can avoid the ponderomotive scattering as well as the vacuum-plasma transition region, which tend to destroy the injected bunch. In our simulations, the effect of the laser pulse dynamics is also taken into account. It is shown that injection at an angle can provide compressed and accelerated electron bunches with less than 2% energy spread. Another advantage of this scheme is that it has less stringent requirements in terms of the size of the injected bunch and there is the potential to trap more charge.

scholarly journals TRANSITION EXCITATION OF A PERFECTLY CONDUCTING CYLINDER BY RELATIVISTIC ELECTRON BUNCHES

2021 ◽  
pp. 96-101
Author(s):  
V.A. Balakirev ◽  
I.N. Onishchenko
Keyword(s):  
Field Strength ◽  
Electromagnetic Radiation ◽  
Relativistic Electron ◽  
Electron Bunch ◽  
Transition Radiation ◽  
Cylinder Surface ◽  
Wave Zone ◽  
Electron Bunches ◽  
Conducting Cylinder

Transition radiation of a relativistic electron bunch, which arises when it collides with the surface of an infinite perfectly conducting cylinder, is considered. The electron bunch moves perpendicular to the cylinder surface. Expressions for the field strength of electromagnetic radiation in the wave zone are obtained and investigated.

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