Simulation of Charged Electron Plasma Heating by an Additional Electron Beam
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Simulation of Charged Electron Plasma Heating by an Additional Electron Beam A. E. Dubinova, b, *, V. D. Selemira, and V. P. Tarakanovc, d a Russian
Federal Nuclear Center —All-Russian Scientific Research Institute of Experimental Physics (RFNC-VNIIEF), Sarov, Nizhny Novgorod oblast, 607188 Russia b Sarov Institute of Physics and Technology, Sarov, Nizhny Novgorod oblast, 607186 Russia c Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow, 125412 Russia d National Research Nuclear University MEPhI, Moscow, 115409 Russia *e-mail: [email protected] Received April 4, 2020; revised May 3, 2020; accepted May 7, 2020
Abstract—The interaction of an additional electron beam with a previously created charged electron plasma of the squeezed state of two counter-propagating superlimiting electron beams in a closed equipotential cavity was studied numerically. The onset of plasma–beam instability in the absence of ions and quasi-linear relaxation is demonstrated. A significant broadening of the EDF towards higher electron energies was established. The considered process can be useful, for example, in electronic traps operating in the electronic string mode and used for generating highly charged ions with their subsequent injection into ion accelerators. Keywords: superlimiting electron beam, electron plasma, plasma–beam instability, quasilinear relaxation DOI: 10.1134/S1063780X20110021
INTRODUCTION When simulating the dynamics of electrons in a microwave generator on a virtual cathode (VC)—vircator, it was found in [1] that a specific state is established in the beam, which is called by the authors as a squeezed state of an electron beam. It is a charged electron plasma with high electron density and temperature, as well as low energies of directed motion of electrons [2]. Subsequently, the squeezed state was intensively studied both experimentally and using particle-in-cell simulation (PiC-simulation) as applied to high-power microwave generators of vircator [3–6], magnetron [7] and plasma–beam types [8], to generators ultrashort current pulses [9, 10], to collective ion accelerators [11], as well as to gas-discharge devices with a beam-plasma discharge [12], etc. Note that the squeezed state of an electron beam is sometimes called differently by different authors: distributed or extended (lengthy) virtual cathode (VC) [7, 11, 12], a slow beam state (as opposed to fast two-stream state) [13], low-energy state [14]. The squeezed state of the beam can also arise in high-current electron traps [15–19], which, according to the proposal of [15], is often called the state of an electron string. The string state is also a quiet hot electron plasma, and, as it turned out, most efficiently provides deep ionization of atoms injected into the plasma. Traps of this type of the “Krion” series are used to generate highly charged ions with their subse-
quent injection into ion accelerators. One of such traps operating in the electron string mode is supposed to be used in the NICA megaproject as
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