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Abstract <p>The phosphor screen made of 1-mm-thick Chromox alumina ceramic has been used to measure the current density distribution over the cross section of an intense pulsed low-energy electron beam. The properties of the screen with deposited gold coatings 30 and 300 nm thick have been investigated. The 30-nm-thick coating is characterized by a high conductivity at a good transparency (~5%) that is sufficient for studying fluorescence. As a result, it is possible to visualize a two-dimensional picture of the beam current distribution with a high spatial resolution. However, it is shown that such a coating has a limited stability against the beam with a current of ≥1.5 A (&gt;0.6 A/cm<sup>2</sup>), an energy of 15 keV, and a duration of 1 ms. The 300-nm-thick coating is much more stable, but is non-transparent to fluorescence radiation, so an image is recorded from the backside of the scintillator plate. Using this approach, it is possible to obtain an image of the beam footprint, but with a lower spatial resolution.</p>

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Use of the Chromox Phosphor Screen for Diagnostics of a Low-Energy Pulsed Electron Beam

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • V. V. Kurkuchekov,
  • I. V. Kandaurov,
  • N. Abed,
  • D. A. Nikiforov,
  • D. S. Tanygina

摘要

Abstract

The phosphor screen made of 1-mm-thick Chromox alumina ceramic has been used to measure the current density distribution over the cross section of an intense pulsed low-energy electron beam. The properties of the screen with deposited gold coatings 30 and 300 nm thick have been investigated. The 30-nm-thick coating is characterized by a high conductivity at a good transparency (~5%) that is sufficient for studying fluorescence. As a result, it is possible to visualize a two-dimensional picture of the beam current distribution with a high spatial resolution. However, it is shown that such a coating has a limited stability against the beam with a current of ≥1.5 A (>0.6 A/cm2), an energy of 15 keV, and a duration of 1 ms. The 300-nm-thick coating is much more stable, but is non-transparent to fluorescence radiation, so an image is recorded from the backside of the scintillator plate. Using this approach, it is possible to obtain an image of the beam footprint, but with a lower spatial resolution.