Generation of high-quality electron beams by ionization injection in a single acceleration stage

Hafz, N.; Li, Song; Li, Guangyu; Mirzaie, Maryam; Zeng, Ming; Zhang, Jie

doi:10.1017/hpl.2016.25

Cited by 14 publications

(7 citation statements)

References 39 publications

(58 reference statements)

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“…( ) [20,22,43], where the normalized transverse momentum p is estimated to be the normalized laser vector at the ionization position, i.e. p=1.9, and the Lorentz factor γ 0 of the wake phase velocity at the gas density of 2.75×10 18 cm −3 is estimated by the linear theory g w w = =18, 0 p as the dotted black line shown in figure 6(a).…”

Section: D-pic Simulations and Discussionmentioning

confidence: 99%

Control of electron beam energy-spread by beam loading effects in a laser-plasma accelerator

Ain

et al. 2020

Plasma Phys. Control. Fusion

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We present experimental results from a laser wakefield electron accelerator driven by 70 TW ultrashort laser pulses in Helium and Helium–Nitrogen gaseous plasmas with two different Nitrogen concentrations, showing distinct electron-beam qualities. In order to get a clear view of the involved phenomenon, two-dimensional particle-in-cell simulations are performed which not only agreed with the experimental results but also provided an investigation on the evolution of accelerating structures. The experimental and simulation results depict that the beam loading effect can strongly modify the longitudinal accelerating electric field of the wake wave, imposing diametrically opposite effects on the final electron-beam qualities, especially the energy-spread, in the Helium–Nitrogen gas mixtures with different Nitrogen concentrations. In the Helium–Nitrogen-mixed plasma with a lower Nitrogen concentration (0.5%), if appropriately controlled, the beam loading effect can be employed to flatten the accelerating electric field for reducing the electron-beam energy spread. In contrast, in the Helium–Nitrogen-mixed plasmas with a higher Nitrogen concentration (5%), the accelerating electric field of the wake is locally reversed by the self-fields of the overloaded electron bunch, and the correspondingly generated negative-slope region of electric field increases the electron-beam energy-spread.

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Section: D-pic Simulations and Discussionmentioning

confidence: 99%

Control of electron beam energy-spread by beam loading effects in a laser-plasma accelerator

Ain

et al. 2020

Plasma Phys. Control. Fusion

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“…As a result, the final electron energy spread is largely reduced. It is called self-truncated ionization injection (Zeng et al 2014), which was demonstrated experimentally in Shanghai Jiao Tong University (Mirzaie et al 2015;Hafz et al 2016). In the second scheme, using two laser pulses with fundamental frequency and high harmonics co-propagating in a gas target, ionization injection can be further controlled by proper choice of the two laser field amplitudes.…”

Section: Laser Plasma-based Electron Accelerationmentioning

confidence: 99%

Summary of laser plasma physics sessions at the first AAPPS-DPP conference

Sheng

2018

Rev. Mod. Plasma Phys.

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The presentations on laser plasma physics at the first AAPPS-DPP conference covered topics of inertial confined fusion physics and technologies, laboratory astrophysics and high-energy density physics, laser plasma-based particle acceleration (electrons and ions) and radiation, fundamental laser plasma physics, and related high-power laser system development. This report summarizes the major advances in these topics presented at the plenary and oral sessions.

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“…In 2014, Yu et al [2] and Xu et al [3] proposed employing two laser pulses of different wavelengths in the generation of low-emittance electron beams, respectively. In such a scheme, a long-wavelength (mid-infrared) laser pulse, with a large ponderomotive force and small peak electric field, was used to excite a large plasma wake while a copropagating or transverse-colliding, time-delayed, and short-wavelength intense laser pulse was employed to trigger ionization injection [4][5][6][7][8][9][10] of electrons from the inner-shell high-Z ions (such as krypton, nitrogen, carbon or oxygen) inside the wake. The short-wavelength laser pulse can produce electrons with small residual momenta (p ⊥ ∼ a 0 ∼ √ Iλ) inside the wake, leading to electron beams with small normalized emittances.…”

Section: Introductionmentioning

confidence: 99%

Enhanced laser wakefield acceleration using dual-color relativistic pulses

Hafz

Song

et al. 2020

Plasma Phys. Control. Fusion

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In a recent article by Li et al (2019 Sci. Adv. 5. eaav7940), experimental results from a dual-color laser wakefield acceleration (LWFA) were presented. In the present paper we, primarily, focus on detailed simulation studies of such a scheme in the self-injection and ionization injection regimes, respectively. The spatiotemporally-overlapped 30 fs dual-color laser pulses are at fundamental (FL, 800 nm, ‘red’) and second-harmonic (SH, 400 nm, ‘blue’) wavelengths. They are (a) co-propagating in an under-dense plasma, (b) relativistically intense (I > 1018 W cm−2) and (c) having relatively high-energy (multi-Joule, loose focusing) and low-energy (sub-Joule, tight focusing), respectively. The basic concept of the scheme is the fact that the depletion length (L pd) for a relativistic laser pulse in an under-dense plasma has an inverse quadratic dependence on the laser wavelength (∝1/λ 2). Here, first by using a single FL 77 TW/30 fs laser pulse to drive a LWFA, an electron beam was accelerated up to ∼400 MeV from a background plasma having an electron density of 1019 cm−3. Then, by driving the same LWFA by co-propagating ‘blue’ 7 TW/30 fs and ‘red’ 70 TW/30 fs laser pulses, the electron energy reached ∼700–800 MeV (maximum). The simulations confirm that in such a dual-color LWFA scheme, the role of the SH laser pulse is post-accelerating electrons after a rapid depletion of the FL laser pulse in the plasma. Furthermore, the SH pulse assists the ionization-injection of the electrons which is an additional benefit of the dual-color LWFA scheme.

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Generation of high-quality electron beams by ionization injection in a single acceleration stage

Cited by 14 publications

References 39 publications

Control of electron beam energy-spread by beam loading effects in a laser-plasma accelerator

Control of electron beam energy-spread by beam loading effects in a laser-plasma accelerator

Summary of laser plasma physics sessions at the first AAPPS-DPP conference

Enhanced laser wakefield acceleration using dual-color relativistic pulses

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