Measurements of magnetic fields in picosecond laser plasma

Summary form only given. We presents the results of measurements of the magnetic fields in the fluoride picosecond laser plasma. The experiments were performed using the laser system “Neodymium” (1,055 mkm, 10 J, 1,5 ps). During generation of the laser plasma was carried out to study the hyperfine structure of the characteristic radiation of the resonance line Ly-alpha H-like ion F IX. They were unbalanced, with deep dips and local maxima in the long wing. We have suggested that the observed line profiles to be explained by the emergence of plasma satellites related to the generation of plasma oscillating electric field. The presence in the laser plasma rapidly oscillating electric fields leads to a strong quasi-static magnetic fields. Thus, in the case of low-intensity laser radiation, these fields should not be observed. Comparative experiments with a pulse length of 10 ns (14,5 J) plasma satellites not identified. In contrast, the shortening of the laser pulse to 1,5 ps (9,4 J), and thus increase the flow by almost 3-4 orders, immediately leads to the observation of complex structures, which are plasma satellites. Assuming that the half-width of the recorded profiles of the oscillation frequency is equal to the electric field, we can estimate the magnetic field magnitude. When the energy of laser pulse is 12,4 J and duration is 1,5 ps get the magnetic field 10⁸ G. Dependence of the magnetic field on the laser pulse energy (for a fixed duration and focal spot is both dependent on the laser flux) was close to the expected B~(W_laser)^1/2.