High-density gas capillary nozzles manufactured by hybrid 3D laser machining technique from fused silica

Tomkus, Vidmantas; Girdauskas, Valdas; Dudutis, Juozas; Gečys, Paulius; Stankevič, Valdemar; Račiukaitis, Gediminas

doi:10.1364/oe.26.027965

Cited by 21 publications

(14 citation statements)

References 29 publications

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“…However, machining such a complicated nozzle geometry, including micrometer scale features, is technologically demanding. In practice, the nozzle was made using nanosecond laser rear-side processing and the femtosecond laser-assisted selective etching technique (FLSE, [32,33]) which consists of chemical etching of previously selectively laser-irradiated fused silica. 3D computational fluid dynamics (CFD) simulations were realized with the software ANSYS Fluent to validate and optimize the design.…”

Section: A One-sided Shock Nozzlementioning

confidence: 99%

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Rovige

Huijts

Andriyash

et al. 2020

Phys. Rev. Accel. Beams

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We report on the stable and continuous operation of a kilohertz laser-plasma accelerator. Electron bunches with 2.6 pC charge and 2.5 MeV peak energy were generated via injection and trapping in a downward plasma density ramp. This density transition was produced in a specially designed asymmetrically shocked gas jet. The reproducibility of the electron source was also assessed over a period of a week and found to be satisfactory with similar values of the beam charge and energy. Particle in cell simulations confirm the role of the shock and the density transition in the electron injection mechanism. These results show that the reproducibility and stability of the laser-plasma accelerator are greatly enhanced on the long-term scale when using a robust scheme for density gradient injection.

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Section: A One-sided Shock Nozzlementioning

confidence: 99%

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Rovige

Huijts

Andriyash

et al. 2020

Phys. Rev. Accel. Beams

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“…All nozzle frames were fabricated using the nanosecond laser and a rear-side or bottom-up machining approach alone, which allowed a high material removal rate 29,52 . However, depending on the design, some of the inner channels were fabricated in combination with the front-side laser ablation.…”

Section: Methodsmentioning

confidence: 99%

“…At the modest pressure of 20–60 bar fused silica nozzles ensure significantly longer operation times than metallic or polymeric nozzles. Laser-assisted hybrid microfabrication technique 29 , 30 of fused silica allows the formation of centimetre-size frame and channels of the diameter less than 40 μm with the surface roughness < 1 μm from a single block. The formation quality exceeds the precision of 3D printing 31 and electro-erosion technique 32 .…”

Section: Introductionmentioning

confidence: 99%

Laser wakefield accelerated electron beams and betatron radiation from multijet gas targets

Tomkus

Girdauskas

Dudutis

et al. 2020

Sci Rep

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Laser Plasma Wakefield Accelerated (LWFA) electron beams and efficiency of betatron X-ray sources is studied using laser micromachined supersonic gas jet nozzle arrays. Separate sections of the target are used for the injection, acceleration and enhancement of electron oscillation. In this report, we present the results of LWFA and X-ray generation using dynamic gas density grid built by shock-waves of colliding jets. The experiment was done with the 40 TW, 35 fs laser at the Lund Laser Centre. Electron energies of 30–150 MeV and 1.0 × 108–5.5 × 108 photons per shot of betatron radiation have been measured. The implementation of the betatron source with separate regions of LWFA and plasma density grid raised the efficiency of X-ray generation and increased the number of photons per shot by a factor of 2–3 relative to a single-jet gas target source.

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“…Here, two different types of gas jets are characterizeda rotationally symmetric gas jet produced by a cylindrical nozzle with de Laval shape, shown in Figure 2 (A) and an elongated jet produced by a 5 mm × 1 mm slit nozzle with de Laval shape along the long side and straight walls along the short side as shown in Figure 2 (B). The slit nozzle was fabricated from fused silica via the bottom-up milling approach using nanosecond laser [28], [29]. This technique allowed the precise 2.5D processing with high material removal rate reaching 0.07 mm 3 /s for the inner converging-diverging channel with only a 1.7 W average laser power.…”

Section: Gas Nozzles For Lpa Experimentsmentioning

confidence: 99%

Tomographic characterization of gas jets for laser-plasma acceleration with increased sensitivity

Chaulagain

Karatodorov

Raclavský

et al. 2021

International Conference on X-Ray Lasers 2020

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We present a new interferometric technique for gas jets density characterization employing a Wollaston shearing interferometer. The distinctive feature of this setup is the double pass of the probe beam through the gas target facilitated by a relay-imaging object arm that images the object on itself and preserves the spatial information. The double pass results in two-fold increase of sensitivity at the same time as the relay-imaging enables the characterization of gas jets with arbitrary gas density distribution by tomographic reconstruction. The capabilities of the double-pass Wollaston interferometer are demonstrated by tomographic density reconstruction of rotationally non-symmetric gas jets that are used as gas targets for the betatron X-ray source at ELI-Beamlines.

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High-density gas capillary nozzles manufactured by hybrid 3D laser machining technique from fused silica

Cited by 21 publications

References 29 publications

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Demonstration of stable long-term operation of a kilohertz laser-plasma accelerator

Laser wakefield accelerated electron beams and betatron radiation from multijet gas targets

Tomographic characterization of gas jets for laser-plasma acceleration with increased sensitivity

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