Initiation and Interaction of a Pulse Beam of Xenon Ions with an Obstacle Viktor A. Morozov ∗1 , Yuriy V. Petrov ∗∗ 1 , Anton A. Lukin1, Viktor M. Kats1, Vladimir A. Bratov1, Sergei I. Fedoseenko1 1Saint‐Petersburg state university, 7‐9, Universitetskaya nab., Russia *viktor.morozov@math.spbu.ru, **yp@yp1004.spb.edu Abstract The concept of creating intense pulsed ion beam from source based on cryogenic target of inert gases (Xe) irradiated by intense electrons beam from the cathode with explosive emission in the nanosecond range was realized. The studies were conducted on the modernized experimental equipment consisting of a short high- voltage pulse generator GKVI-300, high-vacuum pumping system based on turbo-molecular pump TMN-1000M with the ability to hold pressure in research chamber ~ 6 1 10− ⋅ Torr, Gifford-McMahon cryocoolers MSMR110-3, 2/20 with closed He – cycle that provides cooling temperature T=20K and a gas injection system. Gas xenon (Xe 4,8, with the percentage of xenon 99,9988%) was used as working gas It ffreezes to copper anode plate cooled to a temperature of 45-50 K. As a test materials were selected D16 aluminum alloy and stainless austenitic steel 12X18H10T (cryogenic constructional steel) having wide practical application. Micro-topography surface and X-ray photoelectron spectra of samples were obtained at an atomic force microscope Solver PRO-M and the electron spectrometer ESCALAB-5 (line K αAl (h ν=1486.6 eV)) . The impact of short-pulsed ion beam on a sample of D16 alloy and stainless steel 12X18H10T leads to erosion of the surface in the form of separate craters, the depth of which depends on the hardness of the material and the number of pulses. Uniform over the surface area distribution of craters can be achieved when placed in front of target fine-mesh nets of a refractory metal such as molybdenum. A numerical simulation of fracture of aluminum target by a beam of high-energy ions, the finite element method, corresponding flow through one grid was realized. The results are in good agreement with experimental data. Keywords: ion beam, electron beam, erosion, cryogenic target, computational modeling 1. Introduction Influence of powerful short-time beam of particles – photons, electrons, ions – on physical and mechanical properties of constructional materials represents a great interest, both with theoretical, and from the practical point of view. It gains special relevance in connection with the technogenic accident which have occurred recently, especially on nuclear power plants where the processes caused by fast particles are extremely important. Influence is capable to modify significantly physical and chemical and mechanical properties of materials. The knowledge of mechanisms of changes of properties is extremely necessary as for an estimation of possible changes under the influence of particles, and in connection with prospects of creation of new functional materials and changes of characteristics in the necessary direction. Studying of influence of the ions having high energy, on constructional materials very important. Radiation bunch processing everything is wider and more widely applied to modifying of near-surface layers of parts that allows to improve considerably their operational characteristics [1]. The particular interest represents research of influence of the short-time beam having a number of features in relation to influence on physical and mechanical characteristics. The large number of the designs, allowing to receive ionic bunches with various parameters [2] is so far developed. However they represent rather difficult devices that does them extremely expensive. In this regard in this work researches on creation of the source, allowing to receive short-time, about 10-100 nanoseconds, a beam of ions of the high power which design has to be most adapted for the available equipment are conducted.
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