Nanostructured plasmas for enhanced gamma emission at relativistic laser interaction with solids

Иванов, К. А.; Gozhev, D. A.; Rodichkina, S. P.; Макаров, С. В.; Makarov, Sergey; Dubatkov, M. A.; Pikuz, S. A.; Presnov, D. E.; Paskhalov, A. A.; Eremin, N.V.; Brantov, A. V.; Bychenkov, V. Yu.; Volkov, R. V.; Timoshenko, V. Yu.; Kudryashov, S. I.; Savel’ev, A. B.

doi:10.1007/s00340-017-6826-4

Cited by 13 publications

(6 citation statements)

References 40 publications

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“…Modern opportunities allow us to create nanostructures of different shapes and size through a number of different methods [10,[29][30][31][32][33][34]. Four typical examples of targets (which may be varied by a wide range of shapes and sizes) used in laserplasma experiments were irradiated in our work: flat tungsten substrate 1 mm thick, flat silicon wafer 500 µm thick, silicon nanostructures ('nanowires' with a length of ~5 microns and a filling factor on the level of ~60%) obtained by metal-assisted chemical etching of 500 µm thick Si substrate [29] and germanium nanowires obtained by electrochemical deposition onto a 50 µm thick titanium substrate glued to a flat W substrate (the thickness of the nanowire's layer is 0.5-1 µm) [30], see figure 3.…”

Section: Methodsmentioning

confidence: 99%

Imitating the effect of amplified spontaneous emission pedestal at relativistically intense laser interaction with nanostructured solid targets

et al. 2020

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We investigated the effect of focusing sub-nanosecond laser radiation with varied fluence onto the surface of different flat and nanostructured targets utilized in ultra-high intensity laserplasma experiments. Thus, we modeled the action of the prepulse, referred to as an amplified spontaneous emission pedestal, typically present for a relativistic (with peak intensity over 10 18 W cm −2 ) laser pulse with naturally limited contrast. The suppressed melting threshold was detected for the sub-wavelength scale structured material. Local melting leading to distortion of initial structures was detected at a fluence of ~0.2 J cm −2 and below, or 3-5 times lower compared to the flat substrate melting threshold. It is also demonstrated that the threshold lowering is dependent on the production method of the structures, which may be attributed to increased absorption and suppressed heat transfer into the bulk.

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Section: Methodsmentioning

confidence: 99%

Imitating the effect of amplified spontaneous emission pedestal at relativistically intense laser interaction with nanostructured solid targets

et al. 2020

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“…A recent development to enhance the laser-solid interaction is using structured interfaces [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Particularly, nano-wires [32], nano-particles [29], nano-spheres [31] and snowflakes [30] have been proposed to increase the laser absorption efficiency.…”

Section: Introductionmentioning

confidence: 99%

Relativistic laser driven electron accelerator using micro-channel plasma targets

Snyder

George

et al. 2019

Physics of Plasmas

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We present an experimental demonstration of the efficient acceleration of electrons beyond 60 MeV using micro-channel plasma targets. We employed a high-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 m inner diameter, 300 m long microchannel plasma target. The micro-channel was aligned to be collinear with the incident laser pulse, confining the majority of the laser energy within the channel. The measured electron spectrum showed a large increase of the cut-off energy and slope temperature when compared to that from a 2 m flat Copper target, with the cutoff energy enhanced by over 2.6 times and the total energy in electrons >5 MeV enhanced by over 10 times. Three-dimensional particle-in-cell simulations confirm efficient direct laser acceleration enabled by the novel structure as the dominant acceleration mechanism for the high energy electrons. The simulations further reveal the guiding effect of the channel that successfully explains preferential acceleration on the laser/channel axis observed in experiments. Finally, systematic simulations provide scalings for the energy and charge of the electron pulses. Our results show that the micro-channel plasma target is a promising electron source for applications such as ion acceleration, Bremsstrahlung X-ray radiation, and THZ generation.

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“…To test the procedures developed we choose the experimental data obtained (first pulse: 160 mJ @ 1064 nm, 10 ns; main pulse: 60 mJ @ 800 nm, 50 fs) (see [28] for more details on the experiment). It was accumulated from 2000 laser shots with the counting rate 𝜇 = 0.3.…”

Section: Resultsmentioning

confidence: 99%

Real time reconstruction of the fast electron spectrum from high intensity laser plasma interaction using gamma counting technique

Zavorotnyi

Savel’ev

2023

J. Inst.

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X-ray and gamma fluxes from the high intensity laser-plasma interaction are extremely short, well beyond temporal resolution of any detectors. If laser pulses come repetitively, the single photon counting technique allows to accumulate the photon spectra, however, its relation to the spectrum of the initial fast electron population in plasma is not straightforward. We present efficient and fast approach based on the Geant4 package that significantly reduces computer time needed to re-construct the high energy tail of electron spectrum from experimental data accounting for the pileup effect. Here, we first tabulate gamma spectrum from monoenergetic electron bunches of different energy for a given experimental setup, and then compose the simulated spectrum. To account for the pileups, we derive analytical formula to reverse the data. We also consider errors coming from the approximation of the initial electron spectrum by the sum of monoenergetic impacts, the finite range of the electron spectrum, etc. and give estimates on how to choose modelling parameters to minimize the approximation errors. Finally, we present an example of the experimental data treatment for the case of laser-solid interaction using 50 fs laser pulse with intensity above 1018 W/cm2.

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Nanostructured plasmas for enhanced gamma emission at relativistic laser interaction with solids

Cited by 13 publications

References 40 publications

Imitating the effect of amplified spontaneous emission pedestal at relativistically intense laser interaction with nanostructured solid targets

Imitating the effect of amplified spontaneous emission pedestal at relativistically intense laser interaction with nanostructured solid targets

Relativistic laser driven electron accelerator using micro-channel plasma targets

Real time reconstruction of the fast electron spectrum from high intensity laser plasma interaction using gamma counting technique

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