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16Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2016
SPATIAL CONFIGURATION OF THE SOURCE OF CORPUSCULAR RADIATION IN THE INTERACTION OF FEMTOSECOND LASER PULSES WITH CLUSTER
TARGETS
S.S. Makarov'2, S.A. Pikuz1, I.A. Zhvaniya1,2, I.Yu. Skobelev1, A.Ya. Faenov1, T.A. Pikuz1,
S.M. Varzar2
1. Joint Institute for High Temperatures RAS, Moscow, Russia 2. Faculty of Physics of M.V. Lomonosov Moscow State University, Moscow, Russia
seomakarov28@gmail.com
The method proton/ion radiography is widely used both monitoring the production of micro- and nanotechnology and for diagnostic the fundamental properties of matter under extreme conditions. One of the most promising sources of pulsed ion plasma is created by the action of femtosecond laser pulses with target. In particular, a number of important practical advantages has plasma gas-cluster targets[1]. An important condition is fensuring the uniformity of the flow of the probe in a wide solid angle. Respectively, for the further development of lithium-graphical techniques urgent task is to determine the spatial structure of the ion source of a laser-plasma.
The goal of this work is to investigate the degree of anisotropy and the spatial configuration of the ion source in a wide range of angles via setting a pinhole under two different directions from the axis of the laser propagation. Laser pulses with the duration of 36 fs, energy of 160 mJ and laser intensity 4x1017 W/cm2 interacted with CO2 cluster target. To register an image of the ion source, two pin-holes coupled with solid state track detectors (CR-39) installed at 450 and 1350 to the laser propagation direction are used. It was shown the dependence of ion source image from the position of focus of the laser pulse with respect to the jet. We observed depression of efficiency of ion acceleration at large angles in the best focus of the laser. An anisotropy of the ion source is explained by the relativistic self focusing effect in the area with the max laser intensity.
References
1. [1] Y. Fukuda, A. Ya. Faenov et al., PRL 103, 165002 (2009)
