Characterization of supersonic and subsonic gas targets for laser wakefield electron acceleration experiments

Lorenz, Sebastian; Grittani, G.; Chacon‐Golcher, E.; Lazzarini, C. M.; Limpouch, J.; Nawaz, Fahad; Nevrkla, Michal; Vilanova, L.; Levato, T.

doi:10.1063/1.5081509

Cited by 34 publications

(24 citation statements)

References 20 publications

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“…The system of partial differential equations consisting of Navier–Stokes equations for compressible flow, equation of conservation of energy and Shear Stress Transport turbulence model is solved by Finite Volume Method. More details of the simulation method are addressed in 23 . As seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Multi-pass probing for high-sensitivity tomographic interferometry

Karatodorov

Lera

Raclavský

et al. 2021

Sci Rep

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Optical probing is an indispensable tool in research and development. In fact, it has always been the most natural way for humankind to explore nature. However, objects consisting of transparent materials with a refractive index close to unity, such as low-density gas jets, are a typical example of samples that often reach the sensitivity limits of optical probing techniques. We introduce an advanced optical probing method employing multiple passes of the probe through the object to increase phase sensitivity, and relay-imaging of the object between individual passes to preserve spatial resolution. An interferometer with four-passes was set up and the concept was validated by tomographic characterization of low-density supersonic gas jets. The results show an evident increase of sensitivity, which allows for the accurate quantitation of fine features such as a shock formed by an obstacle or a barrel shock on the jet boundary in low ambient gas pressures. Despite its limitations in temporal resolution, this novel method has demonstrated an increase in phase sensitivity in transmission, however, it can also be employed to boost the absorption or polarization contrast of weakly interacting objects in both transmission and reflection setups, thus, upgrading the sensitivity of various optical characterization methods.

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Section: Resultsmentioning

confidence: 99%

Multi-pass probing for high-sensitivity tomographic interferometry

Karatodorov

Lera

Raclavský

et al. 2021

Sci Rep

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“…but also an innovative subsonic gas jet with a 100-µm long micro-capillary coupled to a blade and a fast gas-valve [11] and a cryogenic hydrogen ribbon delivery system [12]. A continuous effort is put on the development of reliable solutions for rapid target delivery, data acquisition and real-time data analysis, suitable for proton acceleration schemes at high repetition rates that were preliminary tested at TERESA up to 3.3 Hz [13,14].…”

Section: Discussionmentioning

confidence: 99%

“…Two target systems are available at TERESA by default: a target matrix with up to 900 solid targets (usually plastic or metallic foils) [6], operating at repetition rates up to 1 Hz and a gas jet, operating with various gas types and pressures [7], as typically employed in laser wake-field electron acceleration, with special care taken over the total amount of gas released into the chamber to allow the target operation at 10 Hz. The list of targets that have been tested at TERESA includes not only conventional thin foils and gas targets, but also an innovative subsonic gas jet with a 100-µm long micro-capillary coupled to a blade and a fast gas-valve [11] and a cryogenic hydrogen ribbon delivery system [12]. A continuous effort is put on the development of reliable solutions for rapid target delivery, data acquisition and real-time data analysis, suitable for proton acceleration schemes at high repetition rates that were preliminary tested at TERESA up to 3.3 Hz [13,14].…”

Section: Available Diagnostics and Target Systemsmentioning

confidence: 99%

TERESA Target Area at ELI Beamlines

Tryus

Grepl

Chagovets

et al. 2020

QuBS

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The TERESA (TEstbed for high REpetition-rate Sources of Accelerated particles) target area, recently commissioned with the L3-HAPLS laser at Extreme Light Infrastructure (ELI)-Beamlines, is presented. Its key technological sections (vacuum and control systems, laser parameters and laser beam transport up to the target) are described, along with an overview of the available plasma diagnostics and targetry, tested at relativistic laser intensities. Perspectives of the TERESA laser–plasma experimental area at ELI-Beamlines are briefly discussed.

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“…The valve backing pressure was varied in the range of 20-64 bar, corresponding to a gas density in the range 2-6 × 10 19 atoms/cm 3 (1 mm above the nozzle). The gas density profile was measured experimentally and simulated using the FLUENT code (details are available in [21]). The gas density profile was uniform along the 1.26-mm side (or z-axis) for the Ar case, while for the N case two peaks were present at the boundaries with density increase of 1.15 times the density at the center.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study of Nanosecond Laser-Generated Plasma Channels

et al. 2020

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Generation of plasma-channels by interaction of gas targets with nanosecond laser beams was investigated experimentally. Such laser-generated plasma channels are very promising for subsequent guiding of high peak power femtosecond laser pulses, over several tens of centimeters, as required in laser wake field electron-acceleration (LWFA). The experimental setup was based on the use of a cylindrical lens (100 mm of focal length) with the aim of proposing a technical solution easy to be integrated into a compact experimental setup for acceleration of multi-GeV electron beams using high peak-power laser systems. A pilot experiment, showing production of asymmetric plasma channels over a length of several millimeters in N and Ar targets with initial neutral-gas atomic density around 5 × 1019 cm−3, is reported. Plasma effective threshold formation was estimated, along with future optimization of the optical setup for a symmetrization of such plasma channel. Scalability of this concept to several tens of centimeters is preliminarily discussed, along with the corresponding critical requirements for an optimal LWFA scheme.

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Characterization of supersonic and subsonic gas targets for laser wakefield electron acceleration experiments

Cited by 34 publications

References 20 publications

Multi-pass probing for high-sensitivity tomographic interferometry

Multi-pass probing for high-sensitivity tomographic interferometry

TERESA Target Area at ELI Beamlines

Experimental Study of Nanosecond Laser-Generated Plasma Channels

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