Probing ultrafast magnetic-field generation by current filamentation instability in femtosecond relativistic laser-matter interactions

Raj, Gaurav; Kononenko, Olena; Gilljohann, Max; Doche, A.; Davoine, Xavier; Caizergues, C.; Chang, Y-Y; Cabadağ, Jurjen Couperus; Debus, A.; Ding, Hao; Förster, M.; Goddet, J. P.; Heinemann, Thomas; Kluge, T.; Kurz, Thomas; Pausch, Richard; Rousseau, P.; Claveria, Pablo San Miguel; Schöbel, Susanne; Siciak, A.; Steiniger, Klaus; Tafzi, Amar; Yu, S.; Hidding, B.; Ossa, A. Martínez de la; Irman, Arie; Karsch, Stefan; Döpp, A.; Schramm, U.; Grémillet, L.; Corde, S.

doi:10.1103/physrevresearch.2.023123

Cited by 28 publications

(23 citation statements)

References 68 publications

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“…The requirements for the external magnetic field will be more tolerant if the electron bunch is more collimated in stage I. In experiments, it is necessary to deplete laser pulse energy (e.g., increase the jet-foil distance or put a laser blocker between stage I and stage II) to avoid the laser-solid interaction [38][39][40][41] .…”

Section: Resultsmentioning

confidence: 99%

Driving positron beam acceleration with coherent transition radiation

Shen

et al. 2020

Commun Phys

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Positron acceleration in plasma wakefield faces significant challenges, as the positron beam must be pre-generated and precisely coupled into the wakefield and, most critically, suffers from defocusing issues. Here we propose a scheme that utilizes laser-driven electrons to produce, inject, and accelerate positrons in a single setup. The high-charge electron beam from wakefield acceleration creates copious electron–positron pairs via the Bethe–Heitler process, followed by enormous coherent transition radiation due to the electrons’ exiting from the metallic foil. Simulation results show that the coherent transition radiation field reaches up to tens of GV m−1, which captures and accelerates the positrons to cut-off energy of 1.5 GeV with energy peak of 500 MeV (energy spread ~ 24.3%). An external longitudinal magnetic field of 30 T is also applied to guide the electrons and positrons during the acceleration process. This proposed method offers a promising way to obtain GeV fast positron sources.

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Section: Resultsmentioning

confidence: 99%

Driving positron beam acceleration with coherent transition radiation

Shen

et al. 2020

Commun Phys

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“…Furthermore we observe a ∼ 13× increase in the signal when the PM is placed within the jet exit versus 4 mm downstream offering a simple but robust tunability of the scattering regime. We observe an increase of ∼ 2× in the electron divergence when the PM is close to the jet (< 1 mm) resulting from strong magnetic fields within the plasma mirror at relativistic laser intensities [28,29]. The perturbation from the electrons passing through the PM bulk occurs after the reflected laser scatters from the accelerated electrons, thus we can assume that the electron divergence remains constant at ∼ 1.9 ± 0.3 mrad during the ICS interaction.…”

Section: Total Radiated Energymentioning

confidence: 79%

Nonlinear Inverse Compton Scattering from a Laser Wakefield Accelerator and Plasma Mirror

Hannasch¹,

Laberge²,

Zgadzaj³

et al. 2021

Preprint

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We generate inverse Compton scattered X-rays in both linear and nonlinear regimes with a 250 MeV laser wakefield electron accelerator and plasma mirror by retro-reflecting the unused drive laser light to scatter from the accelerated electrons. We characterize the X-rays using a CsI(Tl) voxelated scintillator that measures their total energy and divergence as a function of plasma mirror distance from the accelerator exit. At each plasma mirror position, these X-ray properties are correlated with the measured fluence and inferred intensity of the laser pulse after driving the accelerator to determine the laser strength parameter a 0 . The results show that ICS X-rays are generated at a 0 ranging from 0.3±0.1 to 1.65±0.25, and exceed the strength of co-propagating bremsstrahlung and betatron X-rays at least ten-fold throughout this range of a 0 .

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“…For this purpose, the simulated foil was implemented with 50 times the critical density, which is sufficiently dense to lead to the laser-plasma mirror effect. This approach neglects density perturbations around the foil and possibly underestimates the divergence increase due to fields within the foil, as observed in the experiments and also reported in a dedicated study 38 . Closely mimicking the experiment, the central wavelength of the laser is 800 nm, the total energy 1.4 J, the pulse duration 30 fs, and the spot size 19 μm (both FWHM intensity).…”

Section: Methodsmentioning

confidence: 87%

“…Tailored density ramps 36 and plasma lenses 37 can be deployed to mitigate emittance growth during transport of the beams over extended distances between the two stages and to facilitate beam matching into the PWFA section. Placing the laser blocker further downstream minimizes beam degradation imposed by the laser–foil interactions 38 . Furthermore, the witness beam energy can be increased by elongating the PWFA stage close to the depletion distance of the driver.…”

Section: Discussionmentioning

confidence: 99%

“…In the work presented here, it was positioned at ~700 μm upstream from the center of the second gas jet. The intensity of the spent LWFA laser at this position is still sufficiently high to induce complex relativistic processes in the foil, which in turn degrade the divergence of passing electron beams 38 . This can be mitigated by increasing the foil distance further downstream of the LWFA stage.…”

Section: Methodsmentioning

confidence: 99%

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Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams

et al. 2021

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Plasma wakefield accelerators are capable of sustaining gigavolt-per-centimeter accelerating fields, surpassing the electric breakdown threshold in state-of-the-art accelerator modules by 3-4 orders of magnitude. Beam-driven wakefields offer particularly attractive conditions for the generation and acceleration of high-quality beams. However, this scheme relies on kilometer-scale accelerators. Here, we report on the demonstration of a millimeter-scale plasma accelerator powered by laser-accelerated electron beams. We showcase the acceleration of electron beams to 128 MeV, consistent with simulations exhibiting accelerating gradients exceeding 100 GV m−1. This miniaturized accelerator is further explored by employing a controlled pair of drive and witness electron bunches, where a fraction of the driver energy is transferred to the accelerated witness through the plasma. Such a hybrid approach allows fundamental studies of beam-driven plasma accelerator concepts at widely accessible high-power laser facilities. It is anticipated to provide compact sources of energetic high-brightness electron beams for quality-demanding applications such as free-electron lasers.

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Probing ultrafast magnetic-field generation by current filamentation instability in femtosecond relativistic laser-matter interactions

Cited by 28 publications

References 68 publications

Driving positron beam acceleration with coherent transition radiation

Driving positron beam acceleration with coherent transition radiation

Nonlinear Inverse Compton Scattering from a Laser Wakefield Accelerator and Plasma Mirror

Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams

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