The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Default user image.

Mikael Elfman

Researcher

Default user image.

Preliminary results from a study of luminescent materials—For application in the beam imaging system at the ESS

Author

  • R. J.W. Frost
  • C. A. Thomas
  • M. Elfman
  • R. Johansson
  • M. Hartl
  • H. Kocevar
  • K. Michel
  • S. Joshi
  • S. Björklund

Summary, in English

As part of the development of the beam imaging system at the European Spallation Source, luminescent screens have been fabricated by the flame spraying of scintillating materials onto stainless steel backings. A total of seven screens were produced, three of chromia alumina (Al2O3:Cr), two of YAG (Y3Al5O12:Ce) and two of a 50/50 mix of these. The properties of these screens under proton irradiation were evaluated using a 2.55 MeV proton beam at currents of up to 10 μA. Irradiation times were up to 25 h per sample, during which luminescence-, spectrographic-, thermal- and current-data was sampled at a rate of 1 Hz. Preliminary results of these measurements are reported here; with a quantitative analysis presented for one of the chromia alumina screens and a qualitative comparison of all three material types. The luminescent yield for chromia alumina was determined to be around 2000 photons/MeV for a virgin screen, and was found to drop to 1.5% after 167 mC of proton irradiation. A recovery of the luminescence of chromia alumina to >60% was observed after beam current was reduced for an 8 h period. Observations indicate that the YAG and mixed composition screens retain higher luminescence than the chromia alumina even at temperatures of over 200 °C. It is indicated that the luminescence from YAG feeds the R-lines of chromia alumina in the mixed composition screens.

Department/s

  • Nuclear physics

Publishing year

2023-07

Language

English

Pages

227-233

Publication/Series

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

Volume

540

Document type

Journal article

Publisher

Elsevier

Topic

  • Other Materials Engineering

Keywords

  • Beam imaging
  • Chromia alumina
  • ESS
  • Luminescent screens
  • YAG

Status

Published

ISBN/ISSN/Other

  • ISSN: 0168-583X