This article is cited in 1 paper

PLASMA, HYDRO- AND GAS DYNAMICS

Broadband X-ray diagnostics of a relativistic laser plasma

K. A. Ivanov^ab, A. I. Sivko^b, I. N. Tsymbalov^c, G. Kh. Salakhutdinov^d, A. A. Kologrivov^a, A. A. Rupasov^a, E. A. Bolkhovitinov^a, R. V. Volkov^b, A. B. Savel'ev<sup>ab

a</sup> Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia
^b Faculty of Physics, Moscow State University, 119232, Moscow, Russia
^c Institute for Nuclear Research, Russian Academy of Sciences, 117312, Moscow, Russia
^d National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409, Moscow, Russia

Abstract: Absolute measurements of the X-ray spectrum of a plasma formed by intense femtosecond laser radiation on the surface of a solid target in a wide range of interaction parameters with varying the intensity and contrast of a laser pulse have been carried out. The energy distribution of the photon flux from the plasma created on the metal target in the range from 0.1 keV to 1 MeV and higher has been determined for the first time in a single experiment. Using the data obtained, physical processes in the interaction region have been analyzed. The temperatures of background and hot plasma electrons have been estimated. The role of these electron in the generation of the photon flux and the efficiency of laser radiation conversion into various ranges has been studied. A close relationship between the observed results and the contrast and peak intensity of laser radiation has been found.

Received: 26.11.2024
Revised: 13.12.2024
Accepted: 23.12.2024

DOI: 10.31857/S0370274X25020192

 English version: Journal of Experimental and Theoretical Physics Letters, 2025, 121:4, 267–275