Imaging Electron Trajectories in a Laser-Wakefield Cavity Using Betatron X-Ray Radiation

Phuoc, K. Ta; Corde, S.; Shah, Rahul; Albert, F.; Fitour, R.; Rousseau, Jean‐Philippe; Burgy, F.; Mercier, B.; Rousse, A.

doi:10.1103/physrevlett.97.225002

Cited by 125 publications

(94 citation statements)

References 13 publications

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“…y, z plane (red) shows an "ellipse"-like pattern. Such elliptic structures have been discussed in detail and have been detected in experiments [35].…”

Section: B On the Cavity Closing In A Wake Left Behind The Laser Pulsementioning

confidence: 96%

Nonlinear plasma wave in magnetized plasmas

Bulanov¹,

Esirkepov²,

Kando³

et al. 2013

Physics of Plasmas

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Nonlinear axisymmetric cylindrical plasma oscillations in magnetized collisionless plasmas are a model for the electron fluid collapse on the axis behind an ultrashort relativisically intense laser pulse exciting a plasma wake wave. We present an analytical description of the strongly nonlinear oscillations showing that the magnetic field prevents closing of the cavity formed behind the laser pulse. This effect is demonstrated with 3D PIC simulations of the laser-plasma interaction. An analysis of the betatron oscillations of fast electrons in the presence of the magnetic field reveals a characteristic "Four-Ray Star" pattern which has been observed in the image of the electron bunch in experiments [T. Hosokai, et al., Phys. Rev. Lett. 97, 075004 (2006)].

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“…y, z plane (red) shows an "ellipse"-like pattern. Such elliptic structures have been discussed in detail and have been detected in experiments [35].…”

Section: B On the Cavity Closing In A Wake Left Behind The Laser Pulsementioning

confidence: 96%

Nonlinear plasma wave in magnetized plasmas

Bulanov¹,

Esirkepov²,

Kando³

et al. 2013

Physics of Plasmas

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“…We can only see oscillations of the bubble in the plane of polarization of the laser (here along y) and nothing can be seen in the z-plan, which clearly indicates that this is the oscillation of the leading bunch in the laser which creates these large oscillations of the entire cavity. These oscillations of the accelerating cavity lead to acceleration of electrons off-axis, resulting in betatron oscillations inside the bubble of these accelerated electrons [49][50][51][52][53][54] .…”

Section: Pwfa Regimementioning

confidence: 99%

Giga-electronvolt electrons due to a transition from laser wakefield acceleration to plasma wakefield acceleration

Masson-Laborde

Ali

et al. 2014

Physics of Plasmas

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We show through experiments that a transition from laser wakefield acceleration (LWFA) regime to a plasma wakefield acceleration (PWFA) regime can drive electrons up to energies close to the GeV level. Initially, the acceleration mechanism is dominated by the bubble created by the laser in the nonlinear regime of LWFA, leading to an injection of a large number of electrons. After propagation beyond the depletion length, leading to a depletion of the laser pulse, whose transverse ponderomotive force is not able to sustain the bubble anymore, the high energy dense bunch of electrons propagating inside bubble will drive its own wakefield by a PWFA regime. This wakefield will be able to trap and accelerate a population of electrons up to the GeV level during this second stage. Three dimensional (3D) particle-in-cell (PIC) simulations support this analysis, and confirm the scenario.

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“…Assuming that specular reflections of X-rays from the inside walls are negligible, the spiral shapes might be understood as the X-ray emission characteristics of electrons along a spiral-like trajectory [20]. Features similar to the observed ones correspond to an oscillation amplitude of the order of ∼0.1 µm, which is about one order of magnitude smaller than the ones mentioned in [18,19]. This much smaller oscillation amplitude might be due to the particular interaction in the capillary tube, as the experiments reporting larger amplitudes were all performed in gas jets.…”

Section: X-raysmentioning

confidence: 86%

“…5(a) and (b) show spatial features, which suggest particular trajectories of the electrons [18]. A "spiral-like" feature is observed in the images for many different shots and for different capillaries.…”

Section: X-raysmentioning

confidence: 96%

“…However, this is only a lower limit for the extend of the source as the detector is not perfect and the signal drops below the noise level. According to [16][17][18][19], the transverse source size is expected to be of the order of a few microns which would result in a radius difference of about ∼0.2 mm on the detector. This has been neglected as the radius difference due to the longitudinal source size is much larger.…”

Section: X-raysmentioning

confidence: 99%

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Laser-plasma electron acceleration in dielectric capillary tubes

et al. 2011

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Electron beams and betatron X-ray radiation generated by laser wakefield acceleration in long plasma targets are studied. The targets consist of hydrogen filled dielectric capillary tubes of diameter 150 to 200 microns and length 6 to 20 mm. Electron beams are observed for peak laser intensities as low as 5 × 10 17 W/cm 2 . It is found that the capillary collects energy outside the main peak of the focal spot and contributes to keep the beam self-focused over a distance longer than in a gas jet of similar density. This enables the pulse to evolve enough to reach the threshold for wavebreaking, and thus trap and accelerate electrons. No electrons were observed for capillaries of large diameter (250 µm), confirming that the capillary influences the interaction and does not have the same behaviour as a gas cell. Finally, X-rays are used as a diagnostic of the interaction

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Imaging Electron Trajectories in a Laser-Wakefield Cavity Using Betatron X-Ray Radiation

Cited by 125 publications

References 13 publications

Nonlinear plasma wave in magnetized plasmas

Nonlinear plasma wave in magnetized plasmas

Giga-electronvolt electrons due to a transition from laser wakefield acceleration to plasma wakefield acceleration

Laser-plasma electron acceleration in dielectric capillary tubes

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