Персона: Масленников, Сергей Павлович
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Investigation of Discharge Generation Regimes in Penning Ion Sources Under Pulse-Packet Control
© 2022, Springer Science+Business Media, LLC, part of Springer Nature.The efficiency and effectiveness of logging equipment are largely determined by the amplitude-time characteristics of neutron fluxes, which depend on the parameters of the magnetic field generating systems, anode voltage pulses, gas composition, gas pressure, and others. The processes of restoration of the breakdown strength of gas in the interelectrode gap during the pauses between the supply voltage pulses affect the discharge ignition conditions and stability of the neutron flux characteristics. The results of experimental investigations of the pulse-packet operating regimes of Penning ion sources under conditions of wide adjustment of the parameters of the control and power systems for neutron tubes are reported.
Magnetic field design for miniature pulse Penning ion source
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.
Effect of the Magnetic Field on the Characteristics of a Pulsed Penning Ion Source
© 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.
Investigation of the Amplitude-Time Characteristics of a Penning Discharge in Miniature Ion Sources
© 2019, Springer Science+Business Media, LLC, part of Springer Nature.Ion sources based on Penning discharge cells are now widely used in small-size pulsed neutron generators of geophysical well-logging apparatus. The operating efficiency of the apparatus is associated with the amplitude and time parameters of the neutron pulse of the generator, which depend on the gas pressure, geometry of the electrode systems, and other factors. Therefore it is necessary to investigate Penning discharge regimes in the context of control and regulation of the working gas (hydrogen) pressure as well as to measure the amplitude-time characteristics of the discharge as a function of the periodic-pulse power supply parameters. The stable discharge ignition regimes in the ion source were determined experimentally, and it was shown that different discharge regimes exist. The operating regimes of ion sources with a descending voltage dependence of the discharge current were revealed at heightened gas pressure.
Pulse operation mode of inertial electrostatic plasma confinement devices
Influence of External Electric Circuits on the Static and Dynamic Mode of Operation of Multipath Collectors of Powerful Klystrons
© 2020, Pleiades Publishing, Inc.Abstract—The article considers the influence of external electric circuits on the work of the collector zone with an nonstationary intense electron beam. It is shown that the presence of capacitance of the collector and inductance of the external circuit under certain conditions can lead to the appearance of large inhibitory voltage values and deterioration of the klystron output parameters. The results of experimental studies are presented.
Electron-Optical System with Planar-Arranged Coarse-Structured Field Emission Cathodes
© 2019 IEEE.The experimental study results of the coarse-structured field emission cathode cell with a tungsten emitter intended for millimeter range O-type device are presented. The propagation of an electron beam formed by a single-row nine-beam field emission cathode array in long rectangular (0.9 mm x 8.0 mm) beam channel is shown.
Full-scale modeling and experimental study of a gas neutron tube with a Penning ion source
Discrete Amplitude Noise Components of Amplifier Klistrons
© 2020, Pleiades Publishing, Inc.Abstract—The kinematic theory of discrete klystron noise associated with the rectified voltage ripple of power sources is presented. The results of the theory are compared with experimental data and recommendations on the choice of the ripple coefficient are given.
Characteristics of miniature pulsed penning ion source: Experiment and PIC simulation
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.