2021, Rohmanenkov, A. S., Solodovnikov, A. A., Mamedov, N. V., Мамедов, Никита Вадимович

© 2021 Institute of Physics Publishing. All rights reserved.In this work characteristics of pulsed penning ion source for miniature linear accelerators was investigated by experimental measurements and PIC (Particle-In-Cell) simulations. The paper presents dependences of the discharge current and extracted current on intensities of the uniform magnetic field for different pressure. Also, typical examples of the current pulse waveforms obtained by PIC simulation and experiment for different magnetic field are presented. The simulated electron and ion distributions inside discharge gap give qualitative explanation of the experimentally observed fluctuations in current pulses. These current fluctuations arise as a result of the violation of the electric field axial symmetry due to the electron spoke movement of the towards the anode.

2020, Mamedov, N. V., Gubarev, A. V., Zverev, V. I., Maslennikov, S. P., Yurkov, D. I., Мамедов, Никита Вадимович, Зверев, Владимир Игоревич, Масленников, Сергей Павлович, Юрков, Дмитрий Игоревич

Magnetic field configuration for a miniature pulse Penning ion source was designed in this work. The amplitude-time characteristics of discharge and extracted currents were investigated as a function of gas pressure for various magnetic field magnitude and configuration An effect of magnetic field configuration on the Penning's discharge modes and characteristics of the extraction current impulse were experimentally shown. Stable operation modes of the ion source were found in this work. Also the appropriate ranges of working gas pressure and magnetic field configuration were demonstrated, at which the current pulse of the extracted ions had a quasi-rectangular form. For better understanding real magnetic fields distributions of within the discharge cell magnetic field have been calculated in COMSOL software.

2019, Mamedo, N. V., Kurnaev, V. A., Sinelnikov, D. N., Mamedov, I. M., Синельников, Дмитрий Николаевич, Мамедов, Никита Вадимович

Low-energy (1-20 keV) ion scattering spectroscopy is the widespread method of surface analysis [1,2]. The surface layer composition can be reconstructed from narrow peaks in the energy spectra of the scattered inert gas ions and recoil ions [3]. The main advantage of the surface analysis using inert gas ions is the high sensitivity to the first layer of surface atoms. This is due to the low initial energy of the ions (and therefore small ion penetration depth) and the high neutralization probability of the reflected ions, which increases with the penetration depth of the incident particle into the solid [3]. However, for quantitative surface analysis, it is extremely important to determine the neutralization probability (or the probability of ion survival), since this method usually detects reflected ions only.

2019, Mamedov, N.V., Rohmanenkov, A.S., Zverev, V.I., Maslennikov, S.P., Yurkov, D.I., Мамедов, Никита Вадимович, Зверев, Владимир Игоревич, Масленников, Сергей Павлович, Юрков, Дмитрий Игоревич

In the present work, the results of the experimental and particle in cell (PIC) simulation studies of the discharge combustion modes in a miniature Penning ion source (PIS) under the pulse-periodic power supply conditions are presented. Dynamics of discharge ignition and discharge operation mode at a pulsed anode voltage supply are investigated for different values of anode voltage and gas pressure in various magnetic field configurations. Typical examples of current pulse waveforms are shown. Also, numerical simulations of the PIS were performed using 3D PIC combined with Monte Carlo collisions in the code VSim. Temporal dependencies of electron, ion, and potential distributions in the Penning cell are simulated. Differences between the numerical and experimental results are discussed. Published under license by AIP Publishing.

2024, Lobov, M. S., Mamedov, I. M., Mamedov, N. V., Zverev, V. I., Yurkov, D. I., Мамедов, Никита Вадимович, Зверев, Владимир Игоревич, Юрков, Дмитрий Игоревич

2020, Mamedov, N. V., Mamedov, I. M., Мамедов, Никита Вадимович

© 2020, Allerton Press, Inc.Abstract: A simple way of estimating the probability of helium ions He+ surviving when reflected from different metal surfaces is described that employs modeling with the SCATTER and TRIM binary collision codes. The probability of reflected helium ions surviving is estimated from their energy spectra, in the form of the ratio of their areas. The dependences of the probability of He+ ions reflected from Cu and Al surviving on the reciprocal perpendicular velocity are calculated, and the characteristic velocity of an electron migrating from a metal to an incident ion is estimated.

2021, Каньшин, И. А., Мамедов, Н. В., Солодовников, А. А., Ефимов, Н. Е., Мамедов, Никита Вадимович, Ефимов, Никита Евгеньевич

In this paper estimation of the electrodes sputtering of the miniature linear accelerator (MLA) are presented. Also, the experimental area of the deposited metal layer on the insulator surface MLA are shown. The experimental dates are in good qualitatively agreement with the simulated ones.

2024, Rokhmanenkov, A., Mamedov, N., Kanshin, I., Maslennikov, S., Мамедов, Никита Вадимович, Масленников, Сергей Павлович

2020, Solodovnikov, A. A., Mamedov, N. V., Maslennikov, S. P., Yurkov, D. I., Мамедов, Никита Вадимович, Масленников, Сергей Павлович, Юрков, Дмитрий Игоревич

© 2020, Pleiades Publishing, Ltd.Abstract: For a Penning ion generator, the dependences of the amplitude–time characteristics of the discharge current and the extracted current on the intensity and configuration of the magnetic field are studied in a regime with pulsed voltage on the anode.

2017, Mamedov, N. V., Kurnaev, V. A., Sinelnikov, D. N., Kolodko, D. V., Sorokin, I. A., Мамедов, Никита Вадимович, Колодко, Добрыня Вячеславич, Синельников, Дмитрий Николаевич, Сорокин, Иван Александрович

The adsorption of water on the surface is one of the main problems in vacuum technology. Since water is a good adsorbent, its adsorption is the reason that prevents the fast pumping of vacuum systems up to ultra-high vacuum. In addition, water vapor adsorption on metal surfaces during plasma surface interaction is a problem [1]. Singly scattered and recoil ions could form narrow peaks in energy spectra and provide information about atomic composition of the first atomic layer giving information about structure and composition of the surface and very sensitivity to the first layer of atoms [2 -5]. It was also shown [6] that the thickness of light element thin layers on the heavy substrate can be analyzed with good depth resolution (~0,3nm) due to scattering of hydrogen ions with keV energies. Application of ion scattering spectroscopy at pressures up to several mTorr is presented in [7, 8]. In this work experimental results of low energy ion spectroscopy (LEIS) of W samples during water vapor adsorption are presented.