Hot electron and x-ray generation by sub-ns kJ-class laser-produced tantalum plasma

0563641 - FZÚ 2023 RIV GB eng J - Journal Article
Singh, Sushil K. - Krupka, Michal - Istokskaia, Valeria - Krása, Josef - Giuffrida, Lorenzo - Dudžák, Roman - Dostál, Jan - Burian, Tomáš - Versaci, Roberto - Margarone, Daniele - Pisarczyk, T. - Krůs, M. - Juha, Libor
Hot electron and x-ray generation by sub-ns kJ-class laser-produced tantalum plasma.
Plasma Physics and Controlled Fusion. Roč. 64, č. 10 (2022), č. článku 105012. ISSN 0741-3335. E-ISSN 1361-6587
R&D Projects: GA MŠMT(CZ) LM2018114; GA ČR GA19-02545S; GA MŠMT EF16_019/0000789
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:68378271
Keywords : laser-produced tantalum plasma * bremsstrahlung emission * x-ray sources * electron energy distribution * x-ray from kJ-ns laser * electron and x-ray generation
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1088/1361-6587/ac8bf3

This paper presents experimental investigation of temperature scaling and threshold of instability in hot electron and bremsstrahlung radiation from the interaction of sub-nanosecond and kilo-joule class laser pulses with a tantalum foil target at Prague Asterix Laser System. The laser intensity was varied between 4×1015 and 3×1016 W·cm−2 at the target focus. The energy distribution functions of electrons were measured by an angular array of magnetic spectrometers indicating the electron temperature in the range between 30 keV and 70 keV. The bremsstrahlung spectrum was characterized using a scintillator-based calorimeter. In particular, we show the laser-energy scaling of the total flux of hot electrons in the forward and backward directions with respect to the laser vector, the conversion efficiency of the laser energy to the energy carried by hot electrons, and the temperature of hot electrons.
Permanent Link: https://hdl.handle.net/11104/0335544