Narrow band and energy selectable plasma cathode for multistage laser wakefield acceleration

Sakai, Yasuo; Pathak, Naveen; Jin, Zuanming; Zhidkov, Alexei; Sueda, Keiichi; Toran, H.; Tanizawa, Y.; Ôtsuka, Takeshi; Ogino, Jumpei; Nakamura, Hirotaka; Kodama, R.; Hosokai, Tomonao

doi:10.1103/physrevaccelbeams.21.101301

Cited by 11 publications

(6 citation statements)

References 25 publications

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“…In conclusion, we have demonstrated the strong coupling of electrons accelerated with the laser pulse from a gas-jet, with wave breaking electron self-injection and the conventional beam energy slice techniques [23], and the booster produced in the second gas jet by another laser pulse temporally and spatially synchronized with the first laser beam. First, the electron beams with the energy 10 MeV charges ~1.6 pC were focused and transported 1.4 m downstream with energy spread ~3% and spatial size of less than 800 µm in FWHM, respectively.…”

Section: Discussionmentioning

confidence: 84%

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Coupling Effects in Multistage Laser Wake-field Acceleration of Electrons

Jin

Nakamura

Pathak

et al. 2019

Sci Rep

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Staging laser wake-field acceleration is considered to be a necessary technique for developing full-optical jitter-free high energy electron accelerators. Splitting of the acceleration length into several technical parts and with independent laser drivers allows not only the generation of stable, reproducible acceleration fields but also overcoming the dephasing length while maintaining an overall high acceleration gradient and a compact footprint. Temporal and spatial coupling of pre-accelerated electron bunches for their injection in the acceleration phase of a successive laser pulse wake field is the key part of the staging laser-driven acceleration. Here, characterization of the coupling is performed with a dense, stable, narrow energy band of <3% and energy-selectable electron beams with a charge of ~1.6 pC and energy of ~10 MeV generated from a laser plasma cathode. Cumulative focusing of electron bunches in a low-density preplasma, exhibiting the Budker–Bennett effect, is shown to result in the efficient injection of electrons, even with a long distance between the injector and the booster in the laser pulse wake. The measured characteristics of electron beams modified by the booster wake field agree well with those obtained by multidimensional particle-in-cell simulations.

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Section: Discussionmentioning

confidence: 84%

“…In the present work, we investigate these temporal and spatial coupling effects in a booster irradiated by 450 mJ laser pulses with use of well-determined electron bunches generated from a laser-plasma cathode [23] with its charge ~1.6 pC and energy ~10 MeV with the energy spread ΔE<3% (Fig. 1).…”

Section: ]/P[w]mentioning

confidence: 99%

Coupling Effects in Multistage Laser Wake-field Acceleration of Electrons

Jin

Nakamura

Pathak

et al. 2019

Sci Rep

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“…Production of 8 GeV electron bunches, in few tens of centimeters long plasma channel, with the charge around several pC [7] demonstrates that LWFA may become a valuable branch in the electron accelerator family. Electron self-injection in the acceleration part of the laser wake field is a fundamental process for single-stage electron laser wake field acceleration [8][9][10] as well as for a plasma cathode in multi-stage LWFA [11,12]. Presently, electron self-injection is considered to be the only way to generate electron bunches with characteristics suitable for their further acceleration in laser pulse wakes [8,12].…”

Section: Introductionmentioning

confidence: 99%

“…Electron self-injection in the acceleration part of the laser wake field is a fundamental process for single-stage electron laser wake field acceleration [8][9][10] as well as for a plasma cathode in multi-stage LWFA [11,12]. Presently, electron self-injection is considered to be the only way to generate electron bunches with characteristics suitable for their further acceleration in laser pulse wakes [8,12]. Therefore, investigation of the various mechanisms of electron self-injection is particularly important in the development of staging in LWFA.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ionization injection in gas mixtures irradiated by subpetawatt class laser pulses

Zhidkov

Pathak

Koga

et al. 2020

Phys. Rev. Research

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Effects of ionization injection in low and high Z gas mixtures for the laser wake field acceleration of electrons are analyzed with the use of balance equations and particle-incell simulations via test probe particle trajectories in realistic plasma fields and direct simulations of charge loading during the ionization process. It is shown that electrons appearing at the maximum of laser pulse field after optical ionization are trapped in the first bucket of the laser pulse wake. Electrons, which are produced by optical field ionization at the front of laser pulse, propagate backwards; some of them are trapped in the second bucket, third bucket and so on. The efficiency of ionization injection is not * naveenpathak@sanken.osaka-u.ac.jp 1 arXiv:1911.06512v1 [physics.plasm-ph] 15 Nov 2019 high, several pC/mm/bucket. This injection becomes competitive with wave breaking injection at lower plasma density and over a rather narrow range of laser pulse intensity.

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“…This require an extremely stable and reproducible injector with energy slicing scheme to produce electron beams with unprecedented quality, which could be injected and synchronized with the plasma wake in the booster stages. Such stable injector along with stable synchronization with the booster stage are developed for multi-stage LWFA and demonstrated experimentally [37,38,39]. Alternatively, using a well-defined externally injected electron beam, for example from a conventional source, may completely avoid the problems that could arise from the self-injection process.…”

Section: Introductionmentioning

confidence: 99%

Electron Beam Chirp Dexterity in Staging Laser Wakefield Acceleration

Pathak,

Zhidkov,

Hosokai

2020

Preprint

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Particle energy chirp is shown to be a useful instrument in the staging laser wake field acceleration directed to generation of high-quality dense electron beams. The chirp is a necessary tool to compensate non-uniformity of acceleration field in longitudinal direction and achieve essential reduction of energy dispersion. This is demonstrated via particle-in-cell simulations exploiting the splitting technique for plasma and beam electrons. Properly chosen beam chirps allow decrease in the energy dispersion of order of magnitude in every single stage during acceleration to the GeV energy range.

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Narrow band and energy selectable plasma cathode for multistage laser wakefield acceleration

Cited by 11 publications

References 25 publications

Coupling Effects in Multistage Laser Wake-field Acceleration of Electrons

Coupling Effects in Multistage Laser Wake-field Acceleration of Electrons

Characterization of ionization injection in gas mixtures irradiated by subpetawatt class laser pulses

Electron Beam Chirp Dexterity in Staging Laser Wakefield Acceleration

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