Self-Injection and Acceleration of Monoenergetic Electron Beams from Laser Wakefield Accelerators in a Highly Relativistic Regime

Yoshitama, H.; Kameshima, Takashi; Gu, Yuqiu; Guo, Yong; Jiao, Chen; Liu, Hongjie; Peng, Hansheng; Chuan-Ming, Tang; Wang, Xiaodong; Xu, Wen; Wen, Tao; Yuchi, Wu; Zhang, Baohan; Zhu, Qi; Xiao-jun, Huang; Wei-Min, AN; Wenhui, H.; Tang, Chuanxiang; Lin, Y.; Chen, Liming; Kotaki, Hajime; Kando, M.; Nakajima, Kazuhisa

doi:10.1088/0256-307x/25/8/056

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Figure 2b shows the evolution of the normalized laser amplitude a 0 for a 30 fs laser pulse, with an initial amplitude a 0 = 2, propagating in a plasma with density n 0 = 10 19 cm −3 (see Methods for details on the simulation). The laser pulse undergoes three cycles of focusing-defocusing due to relativistic self-focusing and self-steepening, leading to multiple injection 33,34 . A 2 pC bunch is injected very early in the propagation, before the first self-focusing peak, whereas a much more charged bunch (200 pC) is injected around the second self-focusing peak.…”

Section: Resultsmentioning

confidence: 99%

Observation of longitudinal and transverse self-injections in laser-plasma accelerators

et al. 2013

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Laser-plasma accelerators can produce high-quality electron beams, up to giga electronvolts in energy, from a centimetre scale device. The properties of the electron beams and the accelerator stability are largely determined by the injection stage of electrons into the accelerator. The simplest mechanism of injection is self-injection, in which the wakefield is strong enough to trap cold plasma electrons into the laser wake. The main drawback of this method is its lack of shot-to-shot stability. Here we present experimental and numerical results that demonstrate the existence of two different self-injection mechanisms. Transverse self-injection is shown to lead to low stability and poor-quality electron beams, because of a strong dependence on the intensity profile of the laser pulse. In contrast, longitudinal injection, which is unambiguously observed for the first time, is shown to lead to much more stable acceleration and higher-quality electron beams.

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Section: Resultsmentioning

confidence: 99%

Observation of longitudinal and transverse self-injections in laser-plasma accelerators

et al. 2013

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“…The plasma density was deliberately chosen to be n p = 2.0 × 10 18 cm −3 , slightly higher than the optimal density of 1.3 × 10 18 cm −3 determined from the matching condition, i.e., k p w 0 ≈ 2( a 0 ) 1/2 . Such a slightly higher density is likely to cause self-focusing of the laser pulse and lower the self-injection threshold, leading to multiple injections 22 − 28 .…”

Section: Resultsmentioning

confidence: 99%

Generation of femtosecond γ-ray bursts stimulated by laser-driven hosing evolution

Chen

et al. 2016

Sci Rep

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The promising ability of a plasma wiggler based on laser wakefield acceleration to produce betatron X-rays with photon energies of a few keV to hundreds of keV and a peak brilliance of 1022–1023 photons/s/mm2/mrad2/0.1%BW has been demonstrated, providing an alternative to large-scale synchrotron light sources. Most methods for generating betatron radiation are based on two typical approaches, one relying on an inherent transverse focusing electrostatic field, which induces transverse oscillation, and the other relying on the electron beam catching up with the rear part of the laser pulse, which results in strong electron resonance. Here, we present a new regime of betatron γ-ray radiation generated by stimulating a large-amplitude transverse oscillation of a continuously injected electron bunch through the hosing of the bubble induced by the carrier envelope phase (CEP) effect of the self-steepened laser pulse. Our method increases the critical photon energy to the MeV level, according to the results of particle-in-cell (PIC) simulations. The highly collimated, energetic and femtosecond γ-ray bursts that are produced in this way may provide an interesting potential means of exploring nuclear physics in table top photo nuclear reactions.

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“…While, the departure from the matching condition usually causes instability of the bubble structure. The evolution of the bubble structure can induce multi-injection, [5][6][7][8][9] leading to large-energy spread beams. Meanwhile, the unstable evolution may cause transverse oscillations of the bubble structure, leading to collective transverse oscillations of the electron beam, 10,11 which will enlarge the divergence and the transverse emittance of the electron beam, and even shorten the dephasing length which eventually reduces the maximum energy gain of the beam.…”

mentioning

confidence: 99%

Diagnosis of bubble evolution in laser-wakefield acceleration via angular distributions of betatron x-rays

Chen

Hafz

et al. 2014

Applied Physics Letters

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We present an indirect method to diagnose the electron beam behaviors and bubble dynamic evolution in a laser-wakefield accelerator. Four kinds of typical bubble dynamic evolution and, hence, electron beam behaviors observed in Particle-In-Cell simulations are identified correspondingly by simultaneous measurement of distinct angular distributions of the betatron radiation and electron beam energy spectra in experiment. The reconstruction of the bubble evolution may shed light on finding an effective way to better generate high-quality electron beams and enhanced betatron X-rays.

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Self-Injection and Acceleration of Monoenergetic Electron Beams from Laser Wakefield Accelerators in a Highly Relativistic Regime

Cited by 8 publications

References 23 publications

Observation of longitudinal and transverse self-injections in laser-plasma accelerators

Observation of longitudinal and transverse self-injections in laser-plasma accelerators

Generation of femtosecond γ-ray bursts stimulated by laser-driven hosing evolution

Diagnosis of bubble evolution in laser-wakefield acceleration via angular distributions of betatron x-rays

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