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Investigation of the homogeneity of a high-power ion beam formed by a diode with a closed electron drift

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Abstract

The results of an investigation of the energy-density distribution over the cross section of a pulsed ion beam formed with a passive-anode diode in the mode of magnetic insulation and a closed electron drift in the anode–cathode gap are presented. Diodes of two types are studied: with external magnetic insulation (B r diode) on the BIPPAB-450 accelerator (400 kV, 80 ns) and self-magnetic insulation of electrons (spiral diode) on the TEMP-4M accelerator (250 kV, 120 ns). In the investigated diodes, various processes are used to form anode plasma: a breakdown over the surface of a dielectric coating on the anode and ionization of the anode surface with accelerated electrons (B r diode), as well as explosive emission of electrons (spiral diode). To analyze the ion-beam energy density, thermal-imaging diagnostics is used with a spatial resolution of 1–2 mm. The energy-density is calculated from the one-dimensional Child–Langmuir relationship. It is shown that a continuous plasma layer is efficiently formed on the working anode surface for all the investigated diodes. The anode-plasma concentration is rather high, and the beam-energy density is limited by the space charge of ions, but not by the plasma concentration. It is found that, when the magnetic field in the Br-diode anode–cathode gap decreases or the electron current in the spiral diode increases, the energy density of the high-power ion beam rises significantly, but the beam homogeneity decreases.

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Authors and Affiliations

  1. Tomsk Polytechnic University, pr. Lenina 30, Tomsk, 634050, Russia

    A. I. Pushkarev

  2. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China

    Xiao Yu

Authors
  1. A. I. Pushkarev
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  2. Xiao Yu
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Correspondence to A. I. Pushkarev.

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Original Russian Text © A.I. Pushkarev, Xiao Yu, 2016, published in Pribory i Tekhnika Eksperimenta, 2016, No. 5, pp. 60–69.

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Pushkarev, A.I., Yu, X. Investigation of the homogeneity of a high-power ion beam formed by a diode with a closed electron drift. Instrum Exp Tech 59, 678–687 (2016). https://doi.org/10.1134/S0020441216040229

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  • DOI: https://doi.org/10.1134/S0020441216040229

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