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Electron-beam-generated plasma has a wide variety of industry,medicine,aerospace,and other applications,mostly due to its features on relatively low energy cost of ionization irrelative with the pressureand categories of the neutral gases.Researches on the physical properties of the electron-beam plasma can advance the development of its applications.The relationship between the ion-density oscillation and the electron beam-current oscillation in high-pressure electron-beam plasma was studied in this paper.