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

Research output: Contribution to journalArticle

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 (Br 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 (Br 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.

Original languageEnglish
Pages (from-to)678-687
Number of pages10
JournalInstruments and Experimental Techniques
Volume59
Issue number5
DOIs
Publication statusPublished - 1 Sep 2016

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Ion beams
homogeneity
Diodes
ion beams
diodes
Electrons
Anodes
anodes
electrons
flux density
insulation
Plasmas
Insulation
Particle accelerators
accelerators
plasma layers
Infrared imaging
Electric space charge
Ionization
density distribution

ASJC Scopus subject areas

  • Instrumentation

Cite this

Investigation of the homogeneity of a high-power ion beam formed by a diode with a closed electron drift. / Pushkarev, A. I.; Yu, Xiao.

In: Instruments and Experimental Techniques, Vol. 59, No. 5, 01.09.2016, p. 678-687.

Research output: Contribution to journalArticle

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