High-intensity pulsed ion beam focusing by its own space charge

X. P. Zhu, Q. Zhang, L. Ding, C. C. Zhang, Yu Isakova, A. Prima, A. Pushkarev, M. K. Lei

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The paper presents the results of a study on propagation and focusing of high-intensity pulsed ion beams, produced by a self-magnetically insulated diode of semi-cylindrical geometry at the TEMP-6 accelerator (120 ns, 200-250 kV). We examined the space-charge neutralization of the beam, the energy density in the focus, the divergence of the beam, and its shot-to-shot displacement in the focal plane. It is found that the concentration of low-energy electrons in the beam is 1.3-1.5 times higher than the concentration of ions. We observed additional ion focusing by its own space charge. With an increase in the density of the net negative (electrons and ions) charge of the beam from 3.6 to 9 μC/cm 2 , the total divergence (the sum of the beam divergence in the vertical and horizontal planes) decreases from 11.4 to 4.5°. It leads to an increase in the energy density in the focus from 4 up to 10-12 J/cm 2 . To increase the electrons concentration in the beam, a metal grid installed in the ion beam transport region was used.

Original languageEnglish
Pages (from-to)470-476
Number of pages7
JournalLaser and Particle Beams
Volume36
Issue number4
DOIs
Publication statusPublished - 1 Dec 2018

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Keywords

  • Beam displacement
  • beam divergence
  • energy density
  • focusing
  • pulsed neutralized ion beam
  • space charge
  • statistical analysis of the ion beam parameters

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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