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

Zhidkov, Alexei; Pathak, Naveen; Koga, James; Huang, Kai; Kando, M.; Hosokai, Tomonao

doi:10.1103/physrevresearch.2.013216

Cited by 9 publications

(4 citation statements)

References 49 publications

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“…The facility is dedicated to laser electron acceleration and LWFA-driven, compact X-ray free-electron laser (XFEL). With the benefits of three synchronized laser beamlines, the facility can run a staged electron acceleration and performed the experiment [10][11][12].…”

Section: Jinst 17 T06001mentioning

confidence: 99%

Facilities in Asia for future accelerator development

Kobayashi

Hosokai

Kim³

et al. 2022

J. Inst.

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We introduce and review available and active research facilities that involve novel acceleration concepts in Asia. Most of the facilities equip with high-peak-power (>10 TW) lasers with tens of femtosecond duration for laser wakefield acceleration. The activities in Asia are growing and several problems on the realization of high energy frontier accelerators would be accessed through the existing facilities.

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Section: Jinst 17 T06001mentioning

confidence: 99%

Facilities in Asia for future accelerator development

Kobayashi

Hosokai

Kim³

et al. 2022

J. Inst.

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“…The results reported in the previous sections do not take into account the effects of wakefield forces inducing the beam trapping (see Refs. [39,40] for the theory on ionization-induced injectors), which are also known to be potentially detrimental for transverse beam quality [ 41 , 42 ] . Although our theory is limited to the description of the phase-space just after the bunch slippage behind the laser pulse, it is interesting to compare the beam normalized emittance with the expected (minimum) value without wakefield effects and follow its evolution during the beam acceleration.…”

Section: Rempi Injection Simulationmentioning

confidence: 99%

Accurate electron beam phase-space theory for ionization-injection schemes driven by laser pulses

Tomassini

Massimo

Labate

et al. 2021

High Pow Laser Sci Eng

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After the introduction of the ionization-injection scheme in Laser Wake Field Acceleration and of related high-quality electron beam generation methods as two-color or the Resonant Multi Pulse Ionization injection (ReMPI), the theory of thermal emittance by C. Schroeder et al. , has been used to predict the beam normalised emittance obtainable with those schemes. We recast and extend such a theory, including both higher order terms in the polinomial laser field expansion and non polinomial corrections due to the onset of saturation effects on a single cycle. Also, a very accurate model for predicting the cycle-averaged distribution of the extracted electrons, including saturation and multi-process events, is proposed and tested. We show that our theory is very accurate for the selected processes of Kr 8 + →10 + and Ar 8 + →10 + , resulting in a a maximum error below 1% even in deep saturation regime. The accurate prediction of the beam phase-space can be implemented e.g. in laser-envelope or hybrid PIC/fluid codes, to correctly mimic the cycle-averaged momentum distribution without the need of resolving the intra-cycle dynamics. We introduce further spatial averaging, obtaining expressions for the whole-beam emittance fitting with simulations in a saturated regime, too. Finally, a PIC simulation for a LWFA injector in the ReMPI configuration is discussed.

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“…Along the way, self-consistent numerical simulations, in particular particle-in-cell (PIC) ones, have played a pivotal role in the developing of these compact accelerators [6]. Most of the physical understanding in laser plasma accelerators (LPA) is attributed to these state-of-the-art numerical tools [7,8,9,10,11,12,13,14,15]. High accuracy in the calculations of the characteristics of the accelerated electron bunches such as the mean energy, charge, and emittance has already become ultimately important.…”

Section: Introductionmentioning

confidence: 99%

Amendment of the numerical dispersion in particle-in-cell methods for evaluation of charges of self-injected electron bunches in the laser wakefield acceleration

Pathak

Zhidkov²,

Hosokai³

2021

Preprint

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Total charge and energy evaluations for the electron beams generated in the laser wakefield acceleration (LWFA) is the primary step in the determination of the required target and laser parameters. Particle-in-cell (PIC) simulations is an efficient numerical tool that can provide such evaluations unless the effect of numerical dispersion is not diminished. The numerical dispersion, which is specific for the PIC modeling, affects not only the dephasing lengths in LWFA but also the total amount of the self-injected electrons. A numerical error of the order of 10 −4 − 10 −3 in the calculation of the speed of light results in a significant error in the total injected charge and energy gain of the accelerated electron bunches. In the standard numerical approach, the numerical correction of the speed of light either requires infinitely small spatial grid resolution (which needs large computation platform) or force to compromise with the numerical accuracy. A simple and easy to implement numerical scheme is shown to suppress the numerical dispersion of the electromagnetic pulse in PIC simulations even with a *

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

Cited by 9 publications

References 49 publications

Facilities in Asia for future accelerator development

Facilities in Asia for future accelerator development

Accurate electron beam phase-space theory for ionization-injection schemes driven by laser pulses

Amendment of the numerical dispersion in particle-in-cell methods for evaluation of charges of self-injected electron bunches in the laser wakefield acceleration

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