CHARACTERISTICS OF GeV ELECTRON BUNCHES ACCELERATED BY INTENSE LASERS IN VACUUM

2000 ◽  
Vol 14 (19) ◽  
pp. 693-699 ◽  
Author(s):  
P. X. WANG ◽  
Y. K. HO ◽  
Q. KONG ◽  
X. Q. YUAN ◽  
N. CAO ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Electron Bunch ◽  
Electron Bunches ◽  
Incoming Electron ◽  
Laser Wave ◽  
Total Fraction

This paper studies the characteristics of GeV electron bunches driven by ultra-intense lasers in vacuum based on the mechanism of capture and violent acceleration scenario [CAS, see, e.g. J. X. Wang et al., Phys. Rev.E58, 6575 (1998)], which shows an interesting prospect of becoming a new principle of laser-driven accelerators. It has been found that the accelerated GeV electron bunch is a macro-pulse composed of a lot of micro-pulses, which is analogous to the structure of the bunches produced by conventional linacs. The macro-pulse corresponds to the duration of the laser pulse while the micro-pulse corresponds to the periodicity of the laser wave. Therefore, provided that the incoming electron bunch with comparable sizes as that of the laser pulse synchronously impinges on the laser pulse, the total fraction of electrons captured and accelerated to GeV energy can reach more than 20%. These results demonstrate that the mechanisms of CAS is a relatively effective accelerator mechanism.

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 Trapping and acceleration of short electron bunches in the laser wakefields

2017 ◽  
Vol 35 (4) ◽  
pp. 569-573 ◽  
Author(s):  
N.E. Andreev ◽  
V.E. Baranov ◽  
H.H. Matevosyan
Keyword(s):  
Laser Pulse ◽  
Electron Bunch ◽  
Plasma Channel ◽  
Finite Energy ◽  
Linear Dynamics ◽  
Loading Effect ◽  
Beam Loading ◽  
Electron Bunches ◽  
Bunch Compression ◽  
Small Width

AbstractThe processes of trapping, compression, and acceleration of short electron bunches externally injected into the wakefields generated by intense femtosecond laser pulse in a plasma channel are analyzed and optimized. The influence of the laser non-linear dynamics to the longitudinal bunch compression and impact of the beam loading effect (self-action of the bunch charge) to the finite energy and the energy spread of the accelerated electrons are investigated. The limitations to the charge of accelerated electron bunch determined by the requirement of a small width of the electron energy distribution of the bunch are found.

Characterization of ultra-intense laser in radiation damping regime using ponderomotive scattering

2022 ◽  
Author(s):  
Amol Holkundkar ◽  
Felix Mackenroth
Keyword(s):  
Laser Pulse ◽  
Electron Bunch ◽  
Input Parameter ◽  
Radiation Reaction ◽  
Quantitative Agreement ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Scattered Electron ◽  
Novel Approach ◽  
Particle Simulations

Abstract We present a novel approach to analyzing phase-space distributions of electrons ponderomotively scattered off an ultra-intense laser pulse and comment on implications for thus conceivable in-situ laser-characterization schemes. To this end, we present fully relativistic test particle simulations of electrons scattered from an ultra-intense, counter-propagating laser pulse. The simulations unveil non-trivial scalings of the scattered electron distribution with the laser intensity, pulse duration, beam waist, and energy of the electron bunch. We quantify the found scalings by means of an analytical expression for the scattering angle of an electron bunch ponderomotively scattered from a counter-propagating, ultra-intense laser pulse, also accounting for radiation reaction (RR) through the Landau-Lifshitz (LL) model. For various laser and bunch parameters, the derived formula is in excellent quantitative agreement with the simulations. We also demonstrate how in the radiation-dominated regime a simple re-scaling of our model's input parameter yields quantitative agreement with numerical simulations based on the LL model.

scholarly journals Electron and photon beams interacting with plasma

2006 ◽  
Vol 364 (1840) ◽  
pp. 635-645 ◽  
Author(s):  
Albert Reitsma ◽  
Dino Jaroszynski
Keyword(s):  
Laser Pulse ◽  
Electron Bunch ◽  
Laser Pulses ◽  
Plasma Waves ◽  
Intense Laser ◽  
Wave Number ◽  
Collective Effects ◽  
Photon Beams ◽  
Wave Dynamics ◽  
Intense Laser Pulses

A comparison is made between the interaction of electron bunches and intense laser pulses with plasma. The laser pulse is modelled with photon kinetic theory , i.e. a representation of the electromagnetic field in terms of classical quasi-particles with space and wave number coordinates, which enables a direct comparison with the phase space evolution of the electron bunch. Analytical results are presented of the plasma waves excited by a propagating electron bunch or laser pulse, the motion of electrons or photons in these plasma waves and collective effects, which result from the self-consistent coupling of the particle and plasma wave dynamics.

scholarly journals On Peculiarities of Betatron Oscillations of Accelerated Electron Bunches in Capillary Waveguides

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Mikhail Veysman
Keyword(s):  
Synchrotron Radiation ◽  
Parametric Excitation ◽  
Electron Bunch ◽  
Short Pulse ◽  
Spectral Parameters ◽  
Electron Bunches ◽  
Narrow Capillary ◽  
Parametric Resonances ◽  
Parametric Instabilities ◽  
The One

It is shown that the dynamics of electrons accelerated in narrow capillary waveguides is significantly influenced by the parametric excitation of their betatron oscillations. On the one hand, this excitation can irreversibly spoil the emittance of an accelerated electron bunch that limits the possibilities of their practical use. On the other hand, controlled parametric excitation of betatron oscillations can be used to generate short-pulse sources of synchrotron radiation. The article analyzes the regions of parametric instabilities, their dependence on the parameters of accelerated electron bunches and guiding structures, and their influence on the dynamics of accelerated electrons. The parameters of the generated synchrotron radiation are also estimated. Measurements of the spectral parameters of synchrotron radiation can serve as a tool for diagnostics of betatron oscillations and their excitation in the case of parametric resonances.

scholarly journals CONTROL OF CHARACTERISTICS OF SELF-INJECTED AND ACCELERATED ELECTRON BUNCH IN PLASMA BY LASER PULSE SHAPING ON RADIUS, INTENSITY AND SHAPE

2019 ◽  
pp. 39-42
Author(s):  
V.I. Maslov ◽  
D.S. Bondar ◽  
V. Grigorencko ◽  
I.P. Levchuk ◽  
I.N. Onishchenko
Keyword(s):  
Laser Pulse ◽  
Pulse Shaping ◽  
Electron Bunch ◽  
The Self ◽  
Energy Spread ◽  
Small Energy ◽  
Laser Acceleration ◽  
Laser Pulse Shaping ◽  
Plasma Wakefield

At the laser acceleration of self-injected electron bunch by plasma wakefield it is important to form bunch with small energy spread and small size. It has been shown that laser-pulse shaping on radius, intensity and shape controls characteristics of the self-injected electron bunch and provides at certain shaping small energy spread and small size of self-injected and accelerated electron bunch.

scholarly journals Coupling Effects in Multistage Laser Wake-field Acceleration of Electrons

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhan Jin ◽  
Hirotaka Nakamura ◽  
Naveen Pathak ◽  
Yasuo Sakai ◽  
Alexei Zhidkov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Electron Beams ◽  
High Energy ◽  
Long Distance ◽  
Plasma Cathode ◽  
Particle In Cell ◽  
Wake Field ◽  
Spatial Coupling ◽  
Electron Bunches ◽  
A Charge

AbstractStaging laser wake-field acceleration is considered to be a necessary technique for developing full-optical jitter-free high energy electron accelerators. Splitting of the acceleration length into several technical parts and with independent laser drivers allows not only the generation of stable, reproducible acceleration fields but also overcoming the dephasing length while maintaining an overall high acceleration gradient and a compact footprint. Temporal and spatial coupling of pre-accelerated electron bunches for their injection in the acceleration phase of a successive laser pulse wake field is the key part of the staging laser-driven acceleration. Here, characterization of the coupling is performed with a dense, stable, narrow energy band of <3% and energy-selectable electron beams with a charge of ~1.6 pC and energy of ~10 MeV generated from a laser plasma cathode. Cumulative focusing of electron bunches in a low-density preplasma, exhibiting the Budker–Bennett effect, is shown to result in the efficient injection of electrons, even with a long distance between the injector and the booster in the laser pulse wake. The measured characteristics of electron beams modified by the booster wake field agree well with those obtained by multidimensional particle-in-cell simulations.

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