Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration

Shalloo, R. J.; Corner, L.; Arran, Christopher; Cowley, J.; Cheung, Gemmy; Thornton, C.; Walczak, R.; Hooker, S. M.

doi:10.1016/j.nima.2016.02.044

Cited by 19 publications

(15 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1 shows schematically the experimental arrangement employed (see Supplemental Material at [URL will be inserted by publisher] for further details of the experimental arrangement and analysis methods). Single, temporally-chirped pulses from the laser system were converted into pulse trains by placing a Michelson interferometer between the final laser amplifier and its vacuum compressor, as discussed in references [25,26]. The Michelson acted as a spectral filter with a spectral intensity transmission of the form T (ω) = cos 2 (ω∆x/2c), where ∆x is the path difference between the Michelson arms.…”

mentioning

confidence: 99%

“…With the compressor set to give full compression of an unmodulated input pulse, the output of the combination comprised a pair of short (approximately 50 fs) pulses temporally separated by δτ = ∆x/c. The temporal intensity profiles of the pulse trains were determined by combining a model of the laser compressor and pulse train Michelson with measurements of the pulse train spectrum and single-shot autocorrelation (SSA) [26].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Excitation and Control of Plasma Wakefields by Multiple Laser Pulses

et al. 2017

Self Cite

View full text Add to dashboard Cite

We demonstrate experimentally the resonant excitation of plasma waves by trains of laser pulses. We also take an important first step to achieving an energy recovery plasma accelerator by showing that unused wakefield energy can be removed by an out-of-resonance trailing laser pulse. The measured laser wakefields are found to be in excellent agreement with analytical and numerical models of wakefield excitation in the linear regime. Our results indicate a promising direction for achieving highly controlled, GeV-scale laser-plasma accelerators operating at multi-kilohertz repetition rates. This article was published in Physical Review Letters 119, 044802 on 27 July 2017. DOI: 10.1103/PhysRevLett.119.044802 Copyright 2017 American Physical Society

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Excitation and Control of Plasma Wakefields by Multiple Laser Pulses

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…with low ionization percentage) of the active atoms level. Recently [6] new experimental results on the generation of such a time shaped A small fraction of a single Ti:Sa laser pulse is frequency doubled and, after focusing with a low F/# paraboloid, will constitute the ionizing pulse. The main portion of the pulse is temporally shaped as a train of resonant pulses that will drive a large amplitude plasma wave.…”

Section: The Resonant Multi-pulse Ionization Injectionmentioning

confidence: 99%

High-quality GeV-scale electron bunches with the Resonant Multi-Pulse Ionization Injection

Tomassini

Nicola

Labate

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

Recently a new injection scheme for Laser Wake Field Acceleration, employing a single 100-TW-class laser system, has been proposed. In the Resonant Multi-Pulse Ionization injection (ReMPI) a resonant train of pulses drives a large amplitude plasma wave that traps electrons extracted from the plasma by further ionization of a high-Z dopant (Argon in the present paper). While the pulses of the driver train have intensity below the threshold for the dopant's ionization, the properly delayed and frequency doubled (or more) ionization pulse possesses an electric field large enough to extract electrons, though its normalized amplitude is well below unity. In this paper we will report on numerical simulations results aimed at the generation of GeV-scale bunches with normalized emittance and rms energy below 80 nm × rad and 0.5 %, respectively. Analytical consideration of the FEL performance for a 1.3 GeV bunch will be also reported.

show abstract

“…To implement a flexible and stable injection scheme capable of generating low-emittance bunches, we have proposed a technique that only makes use of a single 100-TW class Ti:Sa laser system. In the resonant multipulse ionization injection [22,37,38] scheme, the CO 2 driver is substituted by a train of pulses that excites the large amplitude wakefield through the multipulse LWFA mechanism [39][40][41][42] [see Fig. 1(a)], keeping each pulse electric field under the ionization threshold for the selected dopant.…”

Section: Introductionmentioning

confidence: 99%

High quality electron bunches for a multistage GeV accelerator with resonant multipulse ionization injection

Tomassini¹,

Terzani²,

Labate

et al. 2019

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

Laser wakefield acceleration of GeV electrons is becoming a mature technique, so that a reliable accelerator delivering stable beams to users communities can now be considered. In such a context, two plasma stages, one injector and one booster stage, offer a flexible solution for optimization. For the injector we consider here the resonant multipulse ionization injection (ReMPI) that can be optimized to generate electron bunches with high enough quality to be efficiently transported to the second stage. In order to better control the beam-loading effect and optimize the beam manipulation after the plasma downramp, a quasiround beam is preferable. In this respect, we present analytical and particle-in-cell results concerning the tunnel-ionization process in presence of two, orthogonally polarized, laser pulses with different wavelengths. We also show, by means of hybrid fluid/PIC numerical simulations, that a stable working point with the ReMPI injector exists at 32 pC, 4 kA peak current, with mean energy of 150 MeV, energy spread of 1.65% rms, normalized emittance ϵ n ¼ 0.23 μm and divergence of 0.6 mrad. The scheme relies on a 150 TW Ti:Sa laser modified to achieve a four-pulses driver train and a third harmonics ionization pulse.

show abstract

Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration

Cited by 19 publications

References 8 publications

Excitation and Control of Plasma Wakefields by Multiple Laser Pulses

Excitation and Control of Plasma Wakefields by Multiple Laser Pulses

High-quality GeV-scale electron bunches with the Resonant Multi-Pulse Ionization Injection

High quality electron bunches for a multistage GeV accelerator with resonant multipulse ionization injection

Contact Info

Product

Resources

About