Monoenergetic electron beam generation in a laser-driven
plasma acceleration

Adachi, Masahiro; Miura, Eisuke; Katō, Susumu; Koyama, Kazuyoshi; Masuda, S.; Watanabe, Takayuki; Ogata, A.; Okamoto, Hiromi; Tanimoto, Mitsumori

doi:10.1002/lapl.200510070

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…The generation of QMEs has now been reported from many groups around the world, and its optimization, scaling, beam quality, and stability has been studied [60][61][62][63][64][65][66][67][68][69][70][71][72][73]. Re- One can see that the peak energy is comparable to the observed maximum energy from SM-LWFAs.…”

Section: Plasma Based Accelerator Experimentsmentioning

confidence: 86%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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Section: Plasma Based Accelerator Experimentsmentioning

confidence: 86%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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“…Applications such as the x-ray generation through Compton scattering 13 or betatron oscillation 14 require electron beams with ever high charge and small divergence, which can be generated by using higher Z gases. A few experiments [15][16][17][18] have reported quasimonoenergetic electron beams with the energy of 7-50 MeV using pure nitrogen gas jet plasmas driven by 2-10 TW laser pulses. Recent particle-in-cell (PIC) simulations have predicted that quasimonoenergetic collimated GeV electrons can be generated by focusing chirped intense lasers pulse into pure nitrogen gas and using ionization injection.…”

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confidence: 99%

Generation of electron beams from a laser wakefield acceleration in pure neon gas

Hafz

Mirzaie

et al. 2014

Physics of Plasmas

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We report on the generation of quasimonoenergetic electron beams by the laser wakefield acceleration of 17-50 TW, 30 fs laser pulses in pure neon gas jet. The generated beams have energies in the range 40-120 MeV and up to $430 pC of charge. At a relatively high density, we observed multiple electron beamlets which has been interpreted by simulations to be the result of breakup of the laser pulse into multiple filaments in the plasma. Each filament drives its own wakefield and generates its own electron beamlet. V

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Lwfa of Atto-Second and Femto-Second Bunches for Pulse Radiolysis

Ogata

Kondoh

Yang

et al. 2007

Int. J. Mod. Phys. B

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Pulse radiolysis spectroscopically studies the initial stage of atomic and molecular reactions induced by electron beams. Single-bunched beams with bunch lengths on the order of femtosecond or shorter are fervently requested for this purpose. The laser wake field acceleration is readily applicable now, which is able to realize beams with bunch length of 1 fs, energy of 30 MeV, repetition rate of 1 Hz, bunch charge of 10 pC, energy width of 10%, etc.

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Monoenergetic electron beam generation in a laser-driven plasma acceleration

Cited by 3 publications

References 30 publications

Control of Laser Plasma Based Accelerators up to 1 GeV

Control of Laser Plasma Based Accelerators up to 1 GeV

Generation of electron beams from a laser wakefield acceleration in pure neon gas

Lwfa of Atto-Second and Femto-Second Bunches for Pulse Radiolysis

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