Multi probes measurements at the PALS Facility Research Centre during high intense laser pulse interactions with various target materials

Marco, Massimo De; Krása, J.; Cikhardt, J.; Consoli, F.; Angelis, R. De; Pfeifer, M.; Krůs, M.; Dostál, J.; Margarone, D.; Picciotto, A.; Velyhan, A.; Klír, D.; Dudžák, R.; Limpouch, J.; Korn, G.

doi:10.1051/epjconf/201816703009

Cited by 3 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hot electrons and the target current are the two distinct sources of EMPs. [4,5] The intensity and distribution of EMPs are strongly related to the laser energy, [6,7] laser duration, [8,9] target size, [10] target shape, [11,12] target thickness, [13] target materials [14][15][16] and target holder. [17] All these critical factors give rise to significant influences on target polarization, potential barrier and hot electrons escaping, which in turn affect the generation of EMPs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electromagnetic pulses generated from ultrashort laser irradiation of solid targets at CLAPA

Xu¹,

Li²,

Xia³

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

Electromagnetic pulses (EMPs) produced by the interaction of a TW femtosecond laser with solid targets at the Compact Laser Plasma Accelerator (CLAPA) are measured and interpreted. The statistical results confirm that the intensities of the EMPs are closely related to both target material and thickness. The signal of the titanium target is more abundant than that of the copper target with the same thickness, and the intensity of EMP is positively correlated with the target thickness for aluminium foil. With the boosted EMP radiations, the energy of accelerated protons is also simultaneously enhanced. In addition, EMPs emitted from the front of the target exceed those from the rear, which are also pertinent to the specific target position. The resonant waveforms in the target chamber are analyzed using the fast Fourier transform, and the local resonance and the attenuation lead to changes of the frequency spectra of EMPs with variation of detecting positions, which is well supported by the modeling results. The findings are beneficial to gaining insight into the mechanism of EMP propagation in a typical target chamber and providing more information for EMP shielding design.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of electromagnetic pulses generated from ultrashort laser irradiation of solid targets at CLAPA

Xu¹,

Li²,

Xia³

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…A set of results obtained under these conditions is described in [24]. Measurements appear to be generally dependent on laser-target interaction in terms of laser energy, intensity and target material, but more investigations are needed to fully understand it.…”

Section: Comparison Of Results For Antennas and Current Probementioning

confidence: 99%

EMP characterization at PALS on solid-target experiments

Consoli

Angelis

Marco

et al. 2018

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

We describe the characterization of electromagnetic pulses (EMPs) in experiments on solid targets at PALS laser facility in Prague, for energy up to 600 J and intensity up to 10 16 W cm −2 at focus. Measurements of EMPs have been performed by different conductive probes placed inside and outside the experimental chamber. We show results for different targets and probe configurations, and illustrate effects of spurious direct coupling of these transient fields with the read-out apparatus, which are important for high-energy and high-intensity laser-plasma experiments. The related countermeasures are described and demonstrated to be very effective for improving the signal-to-noise ratio, at expenses of measured bandwidths. They allowed us to detect the EMP components due to the intense neutralization currents flowing through the target holder, and those possibly due to wakefields associated with emitted charged particles, which resulted in these experiments to be of the same order of magnitude. It is the first time both discharge current and associated EMP are effectively measured in the same nanosecond-scale experiment, where this EMP contribution is effectively detected by conductive probes. A remarkable agreement was obtained from comparison of the detected EMP profile with measured neutralization current. We also show the results achieved by means of electromagnetic simulations of fields in the modeled experimental chamber, in particular in the regions where the probes were actually placed during the experiments, and compare them with measured signals. It appears that conductive probes have limitations for the measurement of the high-frequency components of the EMP fields. The illustrated results are of primary importance for the hot topic of EMP characterization and minimization in plants for inertial-confinement-fusion (NIF, LMJ, PETAL) as well as for laser-plasma acceleration (PETAL, ELI, ApollonK).

show abstract

“…Indeed, PALS was notorious for high EMP levels. The EMP amplitudes at PALS were measured in a variety of experimental arrangements [13,[35][36][37][38][39][40][41][42] using loop probes, monopole antenna, a planar super-wideband antenna and a horn antenna. These measurements provided valuable qualitative insight into the EMP characteristics at PALS laser parameters.…”

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

View full text Add to dashboard Cite

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.

show abstract

Multi probes measurements at the PALS Facility Research Centre during high intense laser pulse interactions with various target materials

Cited by 3 publications

References 29 publications

Analysis of electromagnetic pulses generated from ultrashort laser irradiation of solid targets at CLAPA

Analysis of electromagnetic pulses generated from ultrashort laser irradiation of solid targets at CLAPA

EMP characterization at PALS on solid-target experiments

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

Contact Info

Product

Resources

About