Electromagnetic pulse generation in laser-proton acceleration from conductive and dielectric targets

Seimetz, M.; Bellido, P.; Mur, P.; Lera, Roberto; Cruz, A. Ruiz-de la; Sánchez, Isabel; Zaffino, R.; Benlliure, J.; Ruiz, Carlos José González; Roso, L.; Benlloch, J. M.

doi:10.1088/1361-6587/abb2e5

Cited by 5 publications

(2 citation statements)

References 39 publications

(72 reference statements)

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“…The γ peak is followed by a broad pulse from protons with time-of-flight in the range 100-500 ns. High-frequency fluctuations of the signal height, especially within the first 100 ns of the signal, which are caused by an electromagnetic pulse (EMP) generated in the laser-plasma interaction [35], were partly filtered out by a Fast Fourier transform. The corresponding, spectral distribution with a maximum energy of 5 MeV is shown in Figure 8(b).…”

Section: Experiments At Vega-3mentioning

confidence: 99%

Design and Implementation of an Energy Selector for Laser-Accelerated Protons

Reija,

Esteban,

Alejo

et al. 2024

Preprint

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Laser-plasma interactions of ultra-short laser pulses with solid targets can generate highly intense pulses of protons and ions with energies of several MeV. The spectra of these particles are spread over a wide range following a Maxwellian distribution. We report on the design and testing of a magnetic chicane for the selection of protons within a limited energy window. It consists in two successive, anti-parallel dipole fields generated by cost-effective, permanent C-magnets with customized configuration and longitudinal positions. The chicane has been implemented into the target vessel of a petawatt laser facility under constraints on the direction of the incoming laser beam and guidance of the outgoing particles through a vacuum port. The separation of protons and carbon ions within distinct energy intervals has been demonstrated and compared to a ray tracing code.

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Section: Experiments At Vega-3mentioning

confidence: 99%

Design and Implementation of an Energy Selector for Laser-Accelerated Protons

Reija,

Esteban,

Alejo

et al. 2024

Preprint

View full text Add to dashboard Cite

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“…In particular, the target neutralization current resulting from laser-induced electric polarization of the target was identified as an important source of EMP [12][13][14]. The EMP problem continues to attract interest and new results on EMP measurements are continually being published, both for the short-pulse [15][16][17][18] and long-pulse facilities [19]. It should be noted that mechanisms involved in EMP generation are relevant also to other areas of laser plasma research, such as the post-acceleration guiding of laser-accelerated ions [20,21] and generation of strong quasi-static magnetic fields with the use of capacitor-coil targets [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Measurement of strong electromagnetic pulses generated from solid targets at sub-ns kJ-class PALS laser facility

Ra̧czka

Cikhardt

Pfeifer

et al. 2021

Plasma Phys. Control. Fusion

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Measurements had been performed of strong electromagnetic pulses (EMPs) generated as a result of laser–target interaction at the sub-ns kJ-class Prague Asterix Laser System facility. Two conductive Prodyn FD5C D-dot pencil probes were used. Measurements were performed inside the experimental chamber and outside the chamber in a large chamber window 40 cm in diameter in a setup that guaranteed 6 GHz bandwidth. A very good signal-to-noise ratio (17:1) was obtained after some steps were taken to ensure proper EMP shielding of the data collection setup. The EMP signal in the time domain was found to have the form of a sharp initial spike followed by gradually decaying oscillations interspersed with some secondary spikes. The values of the vertical component of the electric field strength were estimated. The highest value recorded in this experiment was 620 − 180 + 260 kV m−1 at a distance of 40 cm from the target. It was observed that plastic targets—particularly the 100s of µm thick plastic foils—tend to generate stronger EMP fields than Cu and Au targets. A time-frequency analysis was performed for a typical shot, clearly showing some spectral features that appear only sometime after the start of the signal and hence indicate EMP generation from secondary sources. Electrons ejected from the target were recorded with the energies exceeding 1.5 MeV, which indicates that highly energetic processes are triggered as a result of the laser–target interaction.

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Gigahertz electromagnetic pulse emission from femtosecond relativistic laser-irradiated solid targets

Qi,

Zhou,

Zheng

et al. 2024

Opt. Express

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The interactions between high-intensity laser and matter produce particle flux and electromagnetic radiation over a wide energy range. The generation of extremely intense transient fields in the radio frequency–microwave regime has been observed in femtosecond-to-nanosecond laser pulses with 1011–1020-W/cm2 intensity on both conductive and dielectric targets. These fields typically cause saturation and damage to electronic equipment inside and near an experimental chamber; nevertheless, they can also be effectively used as diagnostic tools. Accordingly, the characterization of electromagnetic pulses (EMPs) is extremely important and currently a popular topic for present and future laser facilities intended for laser–matter interaction. The picosecond and sub-picosecond laser pulses are considerably shorter than the characteristic electron discharge time (∼0.1 ns) and can be efficient in generating GHz EMPs. The EMP characterization study of femtosecond laser-driven solid targets is currently mainly in the order of 100 mJ laser energy, in this study, the EMP generated by intense (Joule class) femtosecond laser irradiation of solid targets has been measured as a function of laser energy, laser pulse duration, focal spot size, and target materials. And a maximum electric field of the EMP reaching up to 105 V/m was measured. Analyses of experimental results confirm a direct correlation between measured EMP energy and laser parameters in the ultrashort pulse duration regime. The EMP signals generated by femtosecond laser irradiation of solid targets mainly originate from the return current inside the target after hot electron excitation. Numerical simulations of EMP are performed according to the target charging model, which agree well with the experimental results.

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Electromagnetic pulse generation in laser-proton acceleration from conductive and dielectric targets

Cited by 5 publications

References 39 publications

Design and Implementation of an Energy Selector for Laser-Accelerated Protons

Design and Implementation of an Energy Selector for Laser-Accelerated Protons

Measurement of strong electromagnetic pulses generated from solid targets at sub-ns kJ-class PALS laser facility

Gigahertz electromagnetic pulse emission from femtosecond relativistic laser-irradiated solid targets

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