Laser Driven Electron Acceleration in Vacuum, Gases and Plasmas,

Sprangle, P.; Esarey, E.; Krall, J.

doi:10.21236/ada309330

Cited by 6 publications

(6 citation statements)

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“…2 /b), and a 2 = k 2 pz c 2 {to 2 /to 2 -1)/co 2 . In order to obtain the wave equation for the millimeter wave, which is largely left circularly polarized for k 2 > A; 2 , we multiply (4) by A = E Ox + iE oy = 2E Ox and replace k\ by -A 2 (6) c* For a parabolic density profile, co 2 = co 2 o (l + r 2 /a 2 ), i.e., A = A o -co 2 o r 2 /a 2 co 2 , where r refers to cylindrical polar coordinate system, the wave equation takes the form where UJ 2 IH = to 2 + to 2 . As we are considering to > to c , the where electrostatic wave has frequency in the range co UH > co > co p and is known as an upper hybrid wave.…”

Section: Fig 2 Variation Of C 2 Kmentioning

confidence: 99%

Feasibility of a plasma-filled inverse free electron laser accelerator

Jarwal

Sharma

Tripathi

1999

IEEE Trans. Plasma Sci.

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Section: Fig 2 Variation Of C 2 Kmentioning

confidence: 99%

Feasibility of a plasma-filled inverse free electron laser accelerator

Jarwal

Sharma

Tripathi

1999

IEEE Trans. Plasma Sci.

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“…This is the reason why direct laser acceleration in vacuum has been deemed ineffective and most of the research has been focused on the plasma regime where collective fields prevent the expulsion [6,7,8]. In an attempt to mitigate the expulsion in the vacuum regime, some studies examined alternative approaches utilizing longitudinal electric fields of a radially polarized beam [9] and higher-order Gaussian beams [10] for electron acceleration.…”

Section: Introductionmentioning

confidence: 99%

Electron Acceleration Using Twisted Laser Wavefronts

Shi¹,

Blackman²,

Arefiev³

2021

Preprint

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Using plasma mirror injection we demonstrate, both analytically and numerically, that a circularly polarized helical laser pulse can accelerate highly collimated dense bunches of electrons to several hundred MeV using currently available laser systems. The circular-polarized helical (Laguerre-Gaussian) beam has a unique field structure where the transverse fields have helixlike wave-fronts which tend to zero on-axis where, at focus, there are large on-axis longitudinal magnetic and electric fields. The acceleration of electrons by this type of laser pulse is analysed as a function of radial mode number and it is shown that the radial mode number has a profound effect on electron acceleration close to the laser axis. Using three-dimensional particle-in-cell simulations a circular-polarized helical laser beam with power of 0.6 PW is shown to produce several dense attosecond bunches. The bunch nearest the peak of the laser envelope has an energy of 0.47 GeV with spread as narrow as 10%, a charge of 26 pC with duration of ∼ 400 as, and a very low divergence of 20 mrad. The confinement by longitudinal magnetic fields in the near-axis region allows the longitudinal electric fields to accelerate the electrons over a long period after the initial reflection. Both the longitudinal E and B fields are shown to be essential for electron acceleration in this scheme. This opens up new paths towards attosecond electron beams, or attosecond radiation, at many laser facilities around the world.

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“…The self-focusing of laser beams in nonlinear optical media is a fascinating topic which has inspired theoretical and experimental interest [1][2][3]. In self-focusing and self-phase modulation of Cosh-Gaussian laser beam in magnetoplasma using variational approach, it is found that the decentered parameter along with absorption coefficient plays a key role in the nature of self-focusing/defocusing of the beam [4].…”

Section: Introductionmentioning

confidence: 99%

Self-Focusing of Hermite-Cosh-Gaussian Laser Beams in Plasma under Density Transition

Wani

Kant

2014

Advances in Optics

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Self-focusing of Hermite-Cosh-Gaussian (HChG) laser beam in plasma under density transition has been discussed here. The field distribution in the medium is expressed in terms of beam-width parameters and decentered parameter. The differential equations for the beam-width parameters are established by a parabolic wave equation approach under paraxial approximation. To overcome the defocusing, localized upward plasma density ramp is considered, so that the laser beam is focused on a small spot size. Plasma density ramp plays an important role in reducing the defocusing effect and maintaining the focal spot size up to several Rayleigh lengths. To discuss the nature of self-focusing, the behaviour of beam-width parameters with dimensionless distance of propagation for various values of decentered parameters is examined by numerical estimates. The results are presented graphically and the effect of plasma density ramp and decentered parameter on self-focusing of the beams has been discussed.

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Laser Driven Electron Acceleration in Vacuum, Gases and Plasmas,

Cited by 6 publications

References 0 publications

Feasibility of a plasma-filled inverse free electron laser accelerator

Feasibility of a plasma-filled inverse free electron laser accelerator

Electron Acceleration Using Twisted Laser Wavefronts

Self-Focusing of Hermite-Cosh-Gaussian Laser Beams in Plasma under Density Transition

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