Interaction of ultraintense laser pulses with an underdense, preformed plasma channel

2000 ◽  
Vol 28 (4) ◽  
pp. 1078-1083 ◽  
Author(s):  
V. Malka ◽  
J. Faure ◽  
J.R. Marques ◽  
F. Amiranoff ◽  
C. Courtois ◽  
...  
Keyword(s):  
Plasma Channel ◽  
Laser Pulses ◽  
Preformed Plasma

Characterisation of supersonic gas jets for different nozzle geometries for laser-plasma acceleration experiments at SPARC_LAB

2022 ◽  
Vol 17 (01) ◽  
pp. C01049
Author(s):  
G. Costa ◽  
M.P. Anania ◽  
A. Biagioni ◽  
F.G. Bisesto ◽  
M. Del Franco ◽  
...  
Keyword(s):  
High Power ◽  
Plasma Channel ◽  
Laser Pulses ◽  
Industrial Applications ◽  
Point Of View ◽  
Theoretical Point ◽  
High Power Laser ◽  
Power Laser ◽  
Neutral Gas ◽  
Nozzle Geometries

Abstract Plasma-based technology promises a tremendous reduction in size of accelerators used for research, medical, and industrial applications, making it possible to develop tabletop machines accessible for a broader scientific community. The use of high-power laser pulses on gaseous targets is a promising method for the generation of accelerated electron beams at energies on the GeV scale, in extremely small sizes, typically millimetres. The gaseous target in question can be a collimated supersonic gasjet from a nozzle. In this work, a technique for optimising the so generated plasma channel is presented. In detail, a study on the influence of the nozzle throat shape in relation to the uniformity and density of the generated plasma profile is reported. These considerations are discussed first of all from a theoretical point of view, by means of a stationary one-dimensional mathematical model of the neutral gas, thus exploiting the possibility of comparing the properties of the output flow for different nozzle geometries. This is combined with an experimental approach using interferometric longitudinal density measurements of the plasma channel. The latter is generated by a high-power laser pulse focused on a helium gasjet, in the SPARC_LAB laboratories.

Relativistic self-focusing of fs-laser pulses and their heating effect on the preformed plasma

2005 ◽  
Vol 33 (2) ◽  
pp. 480-481 ◽  
Author(s):  
M. Kaluza ◽  
I.B. Foldes ◽  
E. Racz ◽  
M.I.K. Santala ◽  
G.D. Tsakiris ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Heating Effect ◽  
Self Focusing ◽  
Fs Laser ◽  
Preformed Plasma

Effect of transverse ponderomotive nonlinearity on the propagation of ultrashort laser pulses in a plasma channel

2008 ◽  
Vol 15 (12) ◽  
pp. 124503 ◽  
Author(s):  
Ajay K. Upadhyay ◽  
Ram Gopal Singh ◽  
Vijay Singh ◽  
Pallavi Jha
Keyword(s):  
Plasma Channel ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Ponderomotive Nonlinearity ◽  
Ultrashort Laser

scholarly journals Directional transport of fast electrons at the front target surface irradiated by intense femtosecond laser pulses with preformed plasma

2012 ◽  
Vol 30 (1) ◽  
pp. 39-43 ◽  
Author(s):  
X.X. Lin ◽  
Y.T. Li ◽  
B.C. Liu ◽  
F. Liu ◽  
F. Du ◽  
...  
Keyword(s):  
Electron Transport ◽  
Incidence Angle ◽  
Target Surface ◽  
Laser Pulses ◽  
High Energy ◽  
Femtosecond Laser Pulses ◽  
Fast Electrons ◽  
High Energy Electrons ◽  
Preformed Plasma ◽  
Directional Transport

AbstractThe effects of laser incidence angle on lateral fast electron transport at front target surface, when a plasma is preformed, irradiated by intense (>1018 W/cm2) laser pulses, are studied by Kα imaging technique and electron spectrometer. A horizontally asymmetric Kα halo, resulting from directional lateral electron transport and energy deposition, is observed for a large incidence angle (70°). Moreover, a group of MeV high energy electrons is emitted along target surface. It is believed that the deformed preplasma and the asymmetrical distribution of self-generated magnetic field, at large incidence angle, play an important role in the directional lateral electron transport.

The effect of plasma channel on the self-distortion of laser pulse propagating through the collisionless plasma channel

2014 ◽  
Vol 23 (03) ◽  
pp. 1450027
Author(s):  
Navpreet Singh ◽  
Arvinder Singh
Keyword(s):  
Laser Pulse ◽  
Differential Equations ◽  
Density Profile ◽  
Plasma Channel ◽  
Collisionless Plasma ◽  
Beam Width ◽  
Low Intensity ◽  
Pulse Distortion ◽  
Set Up ◽  
Preformed Plasma

This paper presents an investigation of the laser pulse distortion/breakup and the effect of the plasma channel on the laser propagation through the collisionless plasma. Moment theory has been used to derive differential equations of the beam width parameter of the laser propagating through uniform homogenous plasma and preformed plasma channel having parabolic density profile. Differential equations have been set up and solved numerically by using Runge Kutta method. From analysis, it is observed that the low intensity front and rear parts of the laser pulse get defocused/diffracted while the high intensity central portion of the laser pulse gets self-guided during the propagation through uniform homogenous plasma. As a result of this, laser pulse gets distorted. This distortion of the laser pulse has not been observed when the laser beam is propagated through the plasma channel having parabolic density profile. The laser pulse is guided as a whole, even the low intensity front and rear parts of the laser pulse are also guided. Therefore, it is predicted that plasma channel plays a significant role to prevent the distortion/beam breakup of the laser.

scholarly journals Stimulated Raman forward scattering of laser in a pre-formed plasma channel

2012 ◽  
Vol 30 (4) ◽  
pp. 605-611 ◽  
Author(s):  
Anuraj Panwar ◽  
Ashok Kumar ◽  
C.M. Ryu
Keyword(s):  
Growth Rate ◽  
Laser Pulse ◽  
Plasma Wave ◽  
Plasma Channel ◽  
Short Pulse ◽  
Density Perturbation ◽  
Laser Pulses ◽  
Forward Scattering ◽  
Short Pulse Laser ◽  
Stimulated Raman

AbstractStimulated Raman forward scattering (SRFS) of an intense short pulse laser in a plasma channel formed by two pre-laser pulses is investigated. The density nonuniformity of a plasma channel increases the focusing of main laser pulse. Main laser pulse excites a plasma wave and two electromagnetic sideband waves. Laser and the sidebands exert an axial ponderomotive force on electrons driving the plasma wave. The nonlinear currents arise at sideband frequencies. The density perturbation due to plasma wave beats with the oscillatory velocity due to pump to drive the sidebands. The normalized growth rate of SRFS increases with the density nonuniformity of a plasma channel. However, in the presence of a deep plasma channel the focusing is ineffective to laser intensity, but the growth rate increases with the intensity of main laser pulse.

Evolution of chirped laser pulses in a magnetized plasma channel

2014 ◽  
Vol 21 (12) ◽  
pp. 123106 ◽  
Author(s):  
Pallavi Jha ◽  
Hemlata ◽  
Rohit Kumar Mishra
Keyword(s):  
Plasma Channel ◽  
Laser Pulses ◽  
Magnetized Plasma
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