Monitoring of the plasma generated by a gas-puff target source

Wachulak²,

Fiedorowicz

et al. 2020

J. Inst.

Self Cite

A: Silicon carbide detectors were employed to characterize the plasma produced by laser interaction with a double stream gas-puff target source. A 10 Hz repetition rate Nd:YAG laser (1064 nm wavelength, 0.69 J pulse energy and 3 ns pulse duration) was employed to irradiate different gas-puff targets (Argon, Xenon and Sulfur hexafluoride), at different pressures (1-10 bar), emitting plasma radiation in different wavelength ranges (ultraviolet, extreme ultraviolet and soft X-rays). The emission produced by the laser radiation was properly filtered (employing Titanium, Aluminium, Zirconium and Calcium fluoride filters), to narrow down the broad-band emission of the generated plasma. The SiC detectors' signals were compared with a calibrated traditional silicon detector evaluating their differences, i.e. taking into account the plasma stability, the time trace profile and the characteristics of the gas-puff target source. The obtained results, which will be presented and discussed, allow to improve the geometry and configuration of the SiC detectors avoiding saturation and charge recombination effects and getting a better proportionality to the energy and fluence of the detected radiations. K: Detectors for UV, visible and IR photons; Plasma generation (laser-produced, RF, x ray-produced); Radiation monitoring; X-ray detectors 1Corresponding author.

Section: Jinst 15 C05027mentioning

confidence: 93%

Characterization of Si and SiC detectors for laser-generated plasma monitoring in short wavelength range

Wachulak²,

Fiedorowicz

et al. 2020

J. Inst.

Self Cite

“…Copper, in fact, has a density 7.6 times higher than PMMA and an atomic number 2.4 times higher than carbon. The electric field E, in fact, depends on the relation [14] :…”

Section: 3mentioning

confidence: 99%

Investigation of the effect of plasma waves excitation on target normal sheath ion acceleration using fs laser‐irradiating hydrogenated structures

Cutroneo

Contributions to Plasma Physics

et al. 2019

Self Cite

Measurements of ion acceleration in polymethylmethacrylate foils covered by a thin copper film irradiated by fs laser in target normal sheath acceleration regime are presented. The ion acceleration depends on the laser parameters, such as the pulse energy; depends on the irradiation conditions, such as the focal point position of the laser with respect to the target surface; and depends on the target properties, such as the metallic film thickness. The proton acceleration increases in the presence of the metallic film enhancing the plasma electron density, reaching about 1.6 MeV energy for a focal position on the target surface. The plasma diagnostics uses SiC detectors, absorber foils, Faraday cups, and gafchromic films. Employing p‐polarized laser light and a suitable oblique incidence, it is possible to increase the proton acceleration up to about 2.0 MeV thanks to the effects of laser absorption resonance due to plasma waves excitation.

“…The gas pressures were measured before the injection valve and not in vacuum. Opportune filters, placed between the target and the detector, allow one to select different plasma emissions in the SXR/EUV range [6]. The employed filters were made of Al, Ti, CaF 2 and Zr with thicknesses of 750 nm, 200 nm, 5 mm and 250 nm, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, it can be used with repetitive laser shots to obtain repetitive photon emission, without the need to change the target, as would happen for ablation of solid targets [6]. Additionally, the produced SXR at large angles (90°) with respect to the incident laser beam drastically reduces the plasma ion emission in the direction of SXRs.…”

Section: Introductionmentioning

confidence: 99%

UV and soft x-ray emission from gaseous and solid targets employing SiC detectors

Torrisi¹,

Wachulak²,

Torrisi³

2021

Plasma Sci. Technol.

A ns Nd:YAG pulsed laser has been employed to produce plasma from the interaction with a dense target, generating continuum and UV and soft x-ray emission depending on the laser parameters and target properties. The laser hits solid and gaseous targets producing plasma in high vacuum, which was investigated by employing a silicon carbide detector. The two different interaction mechanisms were studied, as well as their dependence on the atomic number. The photon emission from laser-generated plasma produced by solid targets, such as boron nitride (BN) and other elements (Al, Cu, Sn and Ta) and compounds such as polyethylene, has been compared with that coming from plasma produced by irradiating different gas-puff targets based on N2 and other gases (Ar, Xe, Kr, SF6). The experimental results demonstrated that the yields are comparable and, in both cases, increase proportionally to the target atomic number. The obtained results, focusing the attention on the advantages and drawbacks of the employed targets, are presented and discussed.