Interaction of free charged particles with a chirped electromagnetic pulse

Khachatryan, A.G.; Goor, F.A. van; Boller, Klaus J.

doi:10.1103/physreve.70.067601

Cited by 53 publications

(32 citation statements)

References 15 publications

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“…Malka et al [1] reported experimentally the vacuum acceleration of electron in vacuum than in a plasma. Khachatryan et al [11] evaluated the transverse and longitudinal momentum dynamics for the interaction of free charged particles with a chirped electromagnetic pulse and obtained final longitudinal momentum corresponding to energy 8.55 MeV for electron acceleration with linearly chirped pulse. Liu et al [12] proposed the additional acceleration and collimation of relativistic electron beams by intense linearly polarized (LP) laser pulse in plasma.…”

Section: Introductionmentioning

confidence: 99%

Electron acceleration to GeV energy by a chirped laser pulse in vacuum in the presence of azimuthal magnetic field

Ghotra

Kant

2015

Appl. Phys. B

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electrons to MeV energies by a high-intensity subpicosecond laser pulse (10 19 W/cm 2 , 300 fs). Geddes et al. [2] observed a high-quality electron beam from a laser wake field accelerator using a plasma channel guiding. They proposed peak energy in simulation of about 200 MeV which is close to experimental results. An electron in vacuum may be accelerated by the laser field directly. A planarlaser pulse cannot be used for electron acceleration; since it overtakes an electron, the latter is ponderomotively driven forwards in the raising part, but then backwards in trailing part, resulting in no net gain by the electron [6]. An electron can gain and retain significant energy if a magnetic field of suitable magnitude and period is externally applied. The magnetic field strengthens the cyclotron oscillations due to � v × � B force and hence contributes significantly to forward drift and rate of gain of electron energy. The electron energy gain of 1.2 GeV was obtained [7] with an intense laser pulse peak intensity of 8 × 10 21 W/cm 2 . The characteristics variations in polarizations of laser pulse were studied to investigate the betterment in interaction of laser pulse with electron for high energy gain [8-10]. Sohbatzadeh and Aku [8] proposed that the circularly polarized (CP) laser pulse is more efficient in electron bunch acceleration in comparison with elliptical and linear polarizations. The pulse parameters of interaction with electrons are time-averaged with circular polarization which increases the interaction of laser pulse with electrons. Gupta et al.[10] observed the electron energy gain of 1.5 GeV with a radially polarized laser pulse in the presence of magnetic field of about 1 MG. After attaining the maximum energy gain, the electron gets decelerated, losses energy, and tends to get out of phase with the field even with high-intensity laser pulse. A pre-accelerated electron was employed to enforce a confined trajectory for longer duration [9] with a CP laser pulse. It is easier to inject a pre-accelerated Abstract Electron acceleration by a frequency-chirped circularly polarized (CP) laser pulse in vacuum in the presence of azimuthal magnetic field has been studied. A laser pulse propagating along +z-axis interacts with a pre-accelerated electron injected at a small angle in the direction of propagation of laser pulse in vacuum. The electron is accelerated with high energy in the presence of azimuthal magnetic field till the saturation of betatron resonance. A linear frequency chirp increases the duration of interaction of laser pulse with electron and hence enforces the resonance for longer duration. The presence of azimuthal magnetic field further improves the electron acceleration by keeping the electron motion parallel to the direction of propagation for longer distances. Thus, resonant enhancement appears due to the combined effect of chirped CP laser pulse and azimuthal magnetic field. An electron with few MeV of initial energy gains high energy of the order of GeV. Higher energy gain is obtained ...

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Section: Introductionmentioning

confidence: 99%

Electron acceleration to GeV energy by a chirped laser pulse in vacuum in the presence of azimuthal magnetic field

Ghotra

Kant

2015

Appl. Phys. B

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“…Indeed, the evolution of the pulse duration, the bandwidth, and the chirp develops in a fashion that the longitudinal emittance is preserved [8]. Beyond this direct application to the seeded high-gain FEL, the study in this paper falls into the more general interests of studying the charged particle interacting with a chirped electromagnetic wave [9].…”

Section: Introductionmentioning

confidence: 99%

“…According to Eqs. (9) and (34), we know 1 and η 1. Hence, to obtain some insight to the case with an energy chirp (µ = 0) in the electron beam, we expand Eq.…”

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confidence: 99%

Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser

Murphy

Emma

et al. 2007

J. Opt. Soc. Am. B

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In a seeded high-gain Free-electron Laser (FEL), where a coherent laser pulse interacts with an ultra-relativistic electron beam, the seed laser pulse can be frequency chirped, and the electron beam can be energy chirped. Besides these two chirps, the FEL interaction introduces an intrinsic frequency chirp in the FEL even if the above mentioned two chirps are absent. In this paper we examine the interplay of these three chirps. The problem is formulated as an initial value problem, and solved via a Green function approach. Besides the chirp evolution, we also give analytical expressions for the pulse duration and bandwidth of the FEL, which remains fully longitudinally coherent in the high gain exponential growth regime. Because the chirps are normally introduced for a final compression of the FEL pulse, some conceptual issues are discussed. We show that in order to get a short pulse duration, an energy chirp in the electron beam is necessary.

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“…[14][15][16] Plasma wake can travel at the group velocity of laser pulse, close to the speed of light, in order to accelerate particles up to relativistic velocities. In 2004, Khachatryan et al 17,18 showed the possibility to greatly increase the plasma wake field which is generated by the chirped laser pulse. This can be the result of receiving a nonzero transverse momentum of the plasma electron which increases the effective mass of the plasma electron.…”

Section: Introductionmentioning

confidence: 99%

Effect of nonlinear chirped Gaussian laser pulse on plasma wake field generation

Afhami

Eslami

2014

AIP Advances

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An ultrashort laser pulse propagating in plasma can excite a nonlinear plasma wake field which can accelerate charged particles up to GeV energies within a compact space compared to the conventional accelerator devices. In this paper, the effect of different kinds of nonlinear chirped Gaussian laser pulse on wake field generation is investigated. The numerical analysis of our results depicts that the excitation of plasma wave with large and highly amplitude can be accomplished by nonlinear chirped pulses. The maximum amplitude of excited wake in nonlinear chirped pulse is approximately three times more than that of linear chirped pulse. In order to achieve high wake field generation, chirp parameters and functions should be set to optimal values.

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Interaction of free charged particles with a chirped electromagnetic pulse

Cited by 53 publications

References 15 publications

Electron acceleration to GeV energy by a chirped laser pulse in vacuum in the presence of azimuthal magnetic field

Electron acceleration to GeV energy by a chirped laser pulse in vacuum in the presence of azimuthal magnetic field

Interplay of the chirps and chirped pulse compression in a high-gain seeded free-electron laser

Effect of nonlinear chirped Gaussian laser pulse on plasma wake field generation

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