Miniaturized ultraviolet sources driven by dielectric barrier discharge and runaway electron preionized diffuse discharge

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Abstract

In this work we have studied the energy and spectral characteristics of miniaturized dielectric barrier discharge KrCl-, XeCl-, XeBr-, and Xe2-excilamps of various designs as well as short pulse point-like light sources based on runaway electron preionized diffuse discharge. The maximum ultraviolet power density was 20 mW/cm2, which is comparable with the densities of ordinary dielectric barrier discharge excilamps, whereas the maximum efficiencies of the excilamps were not greater than 2.5%. The causes for the low radiation efficiency of the compact dielectric barrier discharge driven excilamps were analyzed. It is found that at an electron concentration of ne > 1014 cm-3, the efficiency decreases due to enhanced quenching of excited atoms or molecules in dissociation by electron impact. The spectral characteristics of a runaway electron preionized diffuse discharge formed between two pointed electrodes in atmospheric pressure air in an inhomogeneous electric field at a gap shorter than 8 mm were investigated. It is shown that the radiation spectrum of the discharge consists of bands of the second positive nitrogen system, and as the discharge transforms to a spark, lines of the electrode material appear in the spectrum. At a gap of 0.5 mm, weak X-rays from the discharge gap were detected.

Original languageEnglish
Pages (from-to)475-487
Number of pages13
JournalOptica Applicata
Volume44
Issue number3
DOIs
Publication statusPublished - 2014

Keywords

  • Excilamps
  • Light sources
  • Plasma spectroscopy
  • Runaway electron preionized diffuse discharge

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials

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