Production of high-quality electron bunches by dephasing and beam loading in channeled and unchanneled laser plasma accelerators

Geddes, C. G. R.; Tóth, Cs.; Tilborg, van J Jeroen; Esarey, E.; Schroeder, C. B.; Bruhwiler, David L.; Nieter, C.; Cary, John R.; Leemans, W.P.

doi:10.1063/1.1882352

Cited by 61 publications

(45 citation statements)

References 46 publications

(77 reference statements)

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“…This is important for many applications, which desire momentum spreads below those of present experiments (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) MeV/c or few % longitudinal spread and ~0.2-2 MeV/c transverse spread). The short plasma wave wavelength X p = ^jtc 2 m/e 2 n e , typically ~ 10-100 um, determines the size requirement for the injected bunch, where n e is the plasma density.…”

Section: Introductionmentioning

confidence: 86%

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Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas

Leemans

Esarey

Geddes

et al. 2009

Comptes Rendus. Physique

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A summary of progress at Lawrence Berkeley National Laboratory is given on: (1) experiments on down-ramp injection; (2) experiments on acceleration in capillary discharge plasma channels; and (3) simulations of a staged laser wakefield accelerator (LWFA). Control of trapping in a LWFA using plasma density down-ramps produced electron bunches with absolute longitudinal and transverse momentum spreads more than ten times lower than in previous experiments (0.17 and 0.02 MeV/c FWHM, respectively) and with central momenta of 0.76 ± 0.02 MeV/c, stable over a week of operation. Experiments were also carried out using a 40 TW laser interacting with a hydrogen-filled capillary discharge waveguide. For a 15 mm long, 200 urn diameter capillary, quasi-monoenergetic bunches up to 300 MeV were observed. By detuning discharge delay from optimum guiding performance, self-trapping was found to be stabilized. For a 33 mm long, 300 pm capillary, a parameter regime with high energy bunches, up to 1 GeV, was found. In this regime, peak electron energy was correlated with the amount of trapped charge. Simulations show that bunches produced on a down-ramn and injected into a channel-guided LWFA can produce stable beams with 0.2 MeV/c-class momentum spread at high energies. ResumeProgres dans le developpement d'accelerateurs laser-plasma utilisant des plasmas profiles transversalement et longitudinalement. On presente un resume des progres obtenus au Lawrence Berkeley National Laboratory sur : (1) les experiences sur l'injection dans une rampe de densite decroissante; (2) les experiences sur 1'acceleration dans des canaux de plasmas de decharges capillaires; et (3) les simulations d'accelerateur par champ de sillage laser (LWFA) en configuration multi-etages. Le controle du piegeage dans un LWFA a l'aide de rampes de densite decroissante produit des paquets d'electrons avec des dispersions de moment cinetique longitudinal et transversal plus de dix fois plus faibles que dans des experiences anterieures (respectivement 0,17 and 0,02 MeV/c FWHM) avec une valeur centrale de 0,76 ± 0,02 MeV/c, stable sur la duree de la semaine d'experience. Des experiences ont egalement ete faites a l'aide d'un laser de 40 TW interagissant avec un guide d'onde constitue par une decharge

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Section: Introductionmentioning

confidence: 86%

“…Bunch quality was best when operating at the trapping threshold [3,4,6,7], and relatively stable operation [5,6,8] was only observed in a narrow parameter window. The plasmas used had approximately constant density along the laser propagation direction, so that the wake phase velocity v$ was ~u g (the laser group velocity [1]).…”

Section: Introductionmentioning

confidence: 99%

Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas

Leemans

Esarey

Geddes

et al. 2009

Comptes Rendus. Physique

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“…Another fundamental constraint is that, unlike the linacs, the present laser wakefield accelerators do not reliably produce monoenergetic beams (although recent work indicates that this will change in the near future). [47][48][49][50][51][52][53][54][55][56][57] The TUHFF LWA has an electron spectrum that is Maxwellian, with the median energy corresponding to that of the electron plasma in the jet. The energy spread is more than 100% realtive to the mean.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast pulse radiolysis using a terawatt laser wakefield accelerator

Oulianov

Crowell

Gosztola

et al. 2007

Journal of Applied Physics

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We report the first ultrafast pulse radiolysis transient absorption spectroscopy measurements from the Terawatt Ultrafast High Field Facility (TUHFF) at Argonne National Laboratory. TUHFF houses a 20 TW Ti:sapphire laser system that generates 2.5 nC sub-picosecond pulses of multi-MeV electrons at 10 Hz using laser wakefield acceleration. The system has been specifically optimized for kinetic measurements in a pump-probe fashion. This requires averaging over many shots which necessitates stable, reliable generation of electron pulses. The latter were used to generate excess electrons in pulse radiolysis of liquid water and concentrated solutions of perchloric acid. The hydronium ions in the acidic solutions react with the hydrated electrons resulting in the rapid decay of the transient absorbance at 800 nm on the picosecond time scale. Time resolution of a few picoseconds has been demonstrated. The current time resolution is determined primarily by the physical dimensions of the sample and the detection sensitivity. Subpicosecond time resolution can be achieved by using thinner samples, more sensitive detection techniques and improved electron beam quality.

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“…Similarly, at LBNL narrow energy spread beams were obtained using 8.5 µm laser spots and short, higher density plasmas without guiding or long, lower density plasmas with self-guiding (Geddes et al 2004a;Geddes et al 2005). The fundamental reason for the observation of these narrow energy spread beams seems consistent with matching the acceleration distance to the dephasing distance of an electron in the plasma wave bucket.…”

Section: Summary and Future Developments (A) High Intensity Laser Guimentioning

confidence: 86%

Laser guiding for GeV laser–plasma accelerators

Leemans

Esarey

Geddes

et al. 2006

Phil. Trans. R. Soc. A.

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Guiding of relativistically intense laser beams in preformed plasma channels is discussed for development of GeV-class laser accelerators. Experiments using a channel guided laser wakefield accelerator (LWFA) at LBNL have demonstrated that near mono-energetic 100 MeV-class electron beams can be produced with a 10 TW laser system. Analysis, aided by particle-in-cell simulations, as well as experiments with various plasma lengths and densities, indicate that tailoring the length of the accelerator, together with loading of the accelerating structure with beam, is the key to production of mono-energetic electron beams. Increasing the energy towards a GeV and beyond will require reducing the plasma density and design criteria are discussed for an optimized accelerator module. The current progress and future directions are summarized through comparison with conventional accelerators, highlighting the unique short term prospects for intense radiation sources based on laser-driven plasma accelerators.

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Production of high-quality electron bunches by dephasing and beam loading in channeled and unchanneled laser plasma accelerators

Cited by 61 publications

References 46 publications

Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas

Progress on laser plasma accelerator development using transversely and longitudinally shaped plasmas

Ultrafast pulse radiolysis using a terawatt laser wakefield accelerator

Laser guiding for GeV laser–plasma accelerators

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