GENERATION OF GOOD-QUALITY RELATIVISTIC ELECTRON BEAM FROM SELF-MODULATED LASER WAKEFIELD ACCELERATION

2007 ◽  
Vol 21 (03n04) ◽  
pp. 398-406 ◽  
Author(s):  
N. HAFZ ◽  
G. H. KIM ◽  
C. KIM ◽  
H. SUK
Keyword(s):  
Relativistic Electron ◽  
Energy Spread ◽  
Intense Laser ◽  
Laser Wakefield Acceleration ◽  
Nitrogen Gas ◽  
Laser Plasma Interaction ◽  
Wakefield Acceleration ◽  
Laser Wakefield ◽  
Central Energy ◽  
A Charge

A relativistic electron bunch with a large charge (~2 nC ) was produced from a self-modulated laser wakefield acceleration configuration. In this experiment, an intense laser pulse with a peak power of 2 TW and a duration of 700 fs was focused in a nitrogen gas jet, and multi-MeV electrons were observed from the strong laser-plasma interaction. By passing the electrons through a small pinhole-like collimator of cone f/70, we observed a narrowing in the electron beam's energy spread. The beam clearly showed a small energy-spread behavior with a central energy of 4.8 MeV and a charge of 115 pC. The acceleration gradient was estimated to be about 20 GeV/m.

scholarly journals Improvement of Properties of Self-Injected and Accelerated Electron Bunch by Laser Pulse in Plasma, Using Pulse Precursor

2019 ◽  
Keyword(s):  
Laser Pulse ◽  
Laser Plasma ◽  
Electron Bunch ◽  
Energy Spread ◽  
Intense Laser ◽  
X Rays ◽  
Laser Wakefield Acceleration ◽  
Small Energy ◽  
Wakefield Acceleration ◽  
Laser Wakefield

The accelerating gradients in conventional linear accelerators are currently limited to ~100 MV/m. Plasma-based accelerators have the ability to sustain accelerating gradients which are several orders of magnitude greater than that obtained in conventional accelerators. Due to the rapid development of laser technology the laser-plasma-based accelerators are of great interest now. Over the past decade, successful experiments on laser wakefield acceleration of electrons in the plasma have confirmed the relevance of this acceleration. Evidently, the large accelerating gradients in the laser plasma accelerators allow to reduce the size and to cut the cost of accelerators. Another important advantage of the laser-plasma accelerators is that they can produce short electron bunches with high energy. The formation of electron bunches with small energy spread was demonstrated at intense laser–plasma interactions. Electron self-injection in the wake-bubble, generated by an intense laser pulse in underdense plasma, has been studied. With newly available compact laser technology one can produce 100 PW-class laser pulses with a single-cycle duration on the femtosecond timescale. With a fs intense laser one can produce a coherent X-ray pulse. Prof. T. Tajima suggested utilizing these coherent X-rays to drive the acceleration of particles. When such X-rays are injected into a crystal they interact with a metallic-density electron plasma and ideally suit for laser wakefield acceleration. In numerical simulation of authors, performed according to idea of Prof. T.Tajima, on wakefield excitation by a X-ray laser pulse in a metallic-density electron plasma the accelerating gradient of several TV/m has been obtained. It is important to form bunch with small energy spread and small size. The purpose of this paper is to show by the numerical simulation that some precursor-laser-pulse, moved before the main laser pulse, controls properties of the self-injected electron bunch and provides at certain conditions small energy spread and small size of self-injected and accelerated electron bunch.

Efficiency and Energy Spread in Laser-Wakefield Acceleration

2005 ◽  
Vol 94 (8) ◽  
Author(s):  
A. J. W. Reitsma ◽  
R. A. Cairns ◽  
R. Bingham ◽  
D. A. Jaroszynski
Keyword(s):  
Energy Spread ◽  
Laser Wakefield Acceleration ◽  
Wakefield Acceleration ◽  
Laser Wakefield

scholarly journals Coupling of longitudinal and transverse motion of accelerated electrons in laser wakefield acceleration

2004 ◽  
Vol 22 (4) ◽  
pp. 407-413 ◽  
Author(s):  
A.J.W. REITSMA ◽  
D.A. JAROSZYNSKI
Keyword(s):  
Laser Pulse ◽  
Group Velocity ◽  
Electron Bunch ◽  
Coupling Effect ◽  
Energy Spread ◽  
Transverse Motion ◽  
Laser Wakefield Acceleration ◽  
Wakefield Acceleration ◽  
Laser Wakefield ◽  
Wakefield Accelerator

The acceleration dynamics of electrons in a laser wakefield accelerator is discussed, in particular the coupling of longitudinal and transverse motion. This coupling effect is important for electrons injected with a velocity below the laser pulse group velocity. It is found that the electron bunch is adiabatically focused during the acceleration and that a finite bunch width contributes to bunch lengthening and growth of energy spread. These results indicate the importance of a small emittance for the injected electron bunch.

Laser wakefield acceleration: the injection issue. Overview and latest results

2006 ◽  
Vol 364 (1840) ◽  
pp. 679-687 ◽  
Author(s):  
M.J van der Wiel ◽  
O.J Luiten ◽  
G.J.H Brussaard ◽  
S.B van der Geer ◽  
W.H Urbanus ◽  
...  
Keyword(s):  
Radio Frequency ◽  
State Of The Art ◽  
Plasma Waves ◽  
Energy Spread ◽  
Laser Wakefield Acceleration ◽  
Electron Bunches ◽  
Wakefield Acceleration ◽  
Laser Wakefield ◽  
External Injection ◽  
Wakefield Accelerator

External injection of electron bunches into laser-driven plasma waves so far has not resulted in ‘controlled’ acceleration, i.e. production of bunches with well-defined energy spread. Recent simulations, however, predict that narrow distributions can be achieved, provided the conditions for properly trapping the injected electrons are met. Under these conditions, injected bunch lengths of one to several plasma wavelengths are acceptable. This paper first describes current efforts to demonstrate this experimentally, using state-of-the-art radio frequency technology. The expected charge accelerated, however, is still low for most applications. In the second part, the paper addresses a number of novel concepts for significant enhancement of photo-injector brightness. Simulations predict that, once these concepts are realized, external injection into a wakefield accelerator will lead to accelerated bunch specs comparable to those of recent ‘laser-into-gasjet’ experiments, without the present irreproducibility of charge and final energy of the latter.

Coupling Efficiency of Intense Laser Pulses to Capillary Tubes for Laser Wakefield Acceleration

2008 ◽  
Vol 36 (4) ◽  
pp. 1746-1750 ◽  
Author(s):  
Nikolay E. Andreev ◽  
Brigitte Cros ◽  
Gilles Maynard ◽  
Patrick Mora ◽  
Franck Wojda
Keyword(s):  
Coupling Efficiency ◽  
Laser Pulses ◽  
Intense Laser ◽  
Laser Wakefield Acceleration ◽  
Capillary Tubes ◽  
Wakefield Acceleration ◽  
Intense Laser Pulses ◽  
Laser Wakefield

Laser wakefield acceleration driven by a few-terawatt laser pulse in a sub-mm nitrogen gas jet

2020 ◽  
Vol 27 (11) ◽  
pp. 113102
Author(s):  
M.-W. Lin ◽  
T.-Y. Chu ◽  
Y.-Z. Chen ◽  
D. K. Tran ◽  
H.-H. Chu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Gas Jet ◽  
Laser Wakefield Acceleration ◽  
Nitrogen Gas ◽  
Wakefield Acceleration ◽  
Laser Wakefield ◽  
Terawatt Laser

Controlled ionization-induced injection by tailoring the gas-density profile in laser wakefield acceleration

2012 ◽  
Vol 78 (4) ◽  
pp. 363-371 ◽  
Author(s):  
MING ZENG ◽  
NASR A. M. HAFZ ◽  
KAZUHISA NAKAJIMA ◽  
LI-MING CHEN ◽  
WEI LU ◽  
...  
Keyword(s):  
Laser Intensity ◽  
Bubble Radius ◽  
Maximum Plasma ◽  
Laser Wakefield Acceleration ◽  
Gas Density ◽  
Injection Process ◽  
Wakefield Acceleration ◽  
Self Focusing ◽  
Laser Wakefield ◽  
Central Energy

AbstractIonization-induced injection into a laser-driven wakefield is studied using 2½D OSIRIS simulations. A laser propagates into a gas mixture of 99.5% helium and 0.5% nitrogen with gas density of each rising linearly from 0 to a peak, after which these remain constant. Simulations show that the process can be controlled by varying the scale length of an up-ramp, the laser intensity, and the maximum plasma density. The injection process is controlled by the bubble radius decreasing as laser propagates up the density gradient and laser self-focusing in the flat-top region. A beam with a central energy of 350 MeV and an energy spread (FWHM) of 1.62% was obtained for an up-ramp length of 135 μm, a normalized vector potential of 2, and a density of 7 × 1018cm−3 (assuming a 0.8 μm wavelength laser).

scholarly journals Generation of monoenergetic proton beams by a combined scheme with an overdense hydrocarbon target and an underdense plasma gas irradiated by ultra-intense laser pulse

2014 ◽  
Vol 32 (4) ◽  
pp. 583-589 ◽  
Author(s):  
Weipeng Yao ◽  
Baiwen Li ◽  
Lihua Cao ◽  
Fanglan Zheng ◽  
Taiwu Huang ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Intense Laser ◽  
Pure Hydrogen ◽  
Intense Laser Pulse ◽  
Laser Wakefield Acceleration ◽  
Proton Beams ◽  
Acceleration Mechanism ◽  
Wakefield Acceleration ◽  
Laser Wakefield ◽  
Underdense Plasma

AbstractAn optimization scheme for the generation of monoenergetic proton beams by using an overdense hydrocarbon target, followed by an underdense plasma gas, irradiated by an ultra-intense laser pulse is presented. The scheme is based on a combination of a radiation pressure acceleration mechanism and a laser wakefield acceleration mechanism, and is verified by one-dimensional relativistic particle-in-cell (1D PIC) simulations. As compared to the pure hydrogen (H) target, protons in the hydrocarbon target can be pre-accelerated to higher energy and compressed in space due to the existence of the heavy carbon atoms, which provides a better injection process for the successive laser wakefield acceleration in the underdense plasma gas, resulting in the generation of a monoenergetic, tens-of-GeV proton beam. Additionally, for the first time, it is found that the use of the hydrocarbon target can reduce the requirement for laser intensity to generate proton beams with the same energy in this combined scheme, as compared to the use of the pure H target.

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