Experimental Studies and Optimization of a Compact Multichannel Nanosecond-Pulse Generator
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Experimental Studies and Optimization of a Compact Multichannel Nanosecond-Pulse Generator V. A. Burtseva, E. P. Bolshakovb,*, D. V. Getmanc, and N. V. Kalinina,** a
Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia b ООО Burtsev Laboratory, St. Petersburg, Russia c Efremov Scientific Research Institute of Electrophysical Apparatus, St. Petersburg, 196641 Russia * e-mail: [email protected] **e-mail: [email protected] Received April 22, 2020; revised May 12, 2020; accepted May 14, 2020
Abstract—The results of experimental studies of a high-voltage multichannel generator for a voltage of up to 100 kV with a pulse duration of 100 ns and a front of 8 ns are presented. Options for optimizing the output parameters using a numerical simulation of the generator equivalent circuit are considered. DOI: 10.1134/S0020441220050280
INTRODUCTION High-voltage nanosecond-pulse generators are widely used in various fields of science and technology, including gas lasers, electronic accelerators, and electromagnetic sources in biology and quantum medicine. When creating generators, typical circuits of high-voltage pulse sources [1] with various modifications are commonly used. Generators are built according to the Arkadiev– Marx and Fitch circuits, as well as on the basis of LC or RC inverters. Energy is stored in generators using capacitors or segments of lines with distributed parameters. When generating voltage pulses of a required duration in the circuits of such generators, additional peaking or cutting spark gaps (SGs) are used, thus leading to a decrease in the efficiency of the energy transfer to a load. When forming high-power high-voltage pulses with a required duration, it is preferable to use generators based on artificial storage–forming lines that are manufactured using the technology applied in the manufacture of sections of pulsed low-inductance capacitors. Such lines, which were developed at the Department of High-Voltage Engineering of Peter the Great St. Petersburg Polytechnic University (SPPU) jointly with the Efremov Scientific Research Institute of Electrophysical Apparatus, were used in a generator to power large-aperture excimer lasers with electronbeam pumping [2]. A detailed analysis of the results of the development of high-voltage single forming lines (SFLs),
which have a high density of the stored energy and generate voltage pulses of a shape close to a rectangular one, was presented in [3]. Such lines can operate into a low-resistance matched load ranging from a fraction of an ohm to a dozen of ohms at a voltage of 50–200 kV across the load. The current amplitude may be tens of kiloamperes, while the pulse-front duration is 15–30 ns. The pulse repetition rate depends on specific designs and applications and may be as high as 1 kHz. The SFL parameters are determined according to the specified values of the load resistance R and pulse duration τ from the relationships: L0 = nLs = τR/2.2, C0 = nCs = τ/2.2R, where n is the number of
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