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Electrohydrodynamic emitters of ion beamsa Raith GmbH, Konrad-Adenauer-Allee 8, Dortmund, 44263, Germany b Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, prosp. akad. Lavrenteva 11, Novosibirsk, 630090, Russian Federation c Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russian Federation d Universidade Nova de Lisboa, Campus de Campolide, Lisboa, 1099-085, Portugal e Ryazan State Radio Engineering University named after V.F. Utkin, Gagarina Street 59/1, Ryazan, 390005, Russian Federation f Wuhan University, Wuhan, Hubei Province, China We discuss physical processes underlying the generation of ion beams with high emission current density in electrohydrodynamic (EHD) emitters based on liquid metals and alloys and with low-temperature ion liquids. We consider EHD effects that influence the emission of ions (ion production mechanisms) and the kinetics of ion interactions in high-density beams. We analyze the factors determining the emission zone size, sustainability of emission at high and low currents, generation of clusters, increase in energy scattering, decrease in brightness, and other features of ion beams. We consider the specific design features of EHD emitters and the problems of practically ensuring their stable operation. Discussed in detail are modern application areas for ion sources with EHD emitters, including technological installations for ion-beam lithography, micro- and nanopatterning, ion microscopes and tools for local mass spectrometry of secondary ions, Ând systems to control and neutralize the potential of spacecraft and electrostatic rocket engines (microthrusters). We analyze prospects for further development of EHD emitters themselves and instruments based on them.
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