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

Frost, R. J.W. LU ; Thomas, C. A. ; Elfman, M. LU ; Johansson, R. ; Hartl, M. ; Kocevar, H. ; Michel, K. ; Joshi, S. and Björklund, S. (2023) In Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 540. p.227-233
Abstract

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... (More)

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.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Beam imaging, Chromia alumina, ESS, Luminescent screens, YAG
in
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
volume
540
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85156268474
ISSN
0168-583X
DOI
10.1016/j.nimb.2023.04.015
language
English
LU publication?
yes
id
8f458fc5-d3e5-45c4-bf5d-4dc134a436d2
date added to LUP
2023-08-10 11:09:01
date last changed
2023-08-10 11:09:01
@article{8f458fc5-d3e5-45c4-bf5d-4dc134a436d2,
  abstract     = {{<p>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 (Al<sub>2</sub>O<sub>3</sub>:Cr), two of YAG (Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>: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 &gt;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.</p>}},
  author       = {{Frost, R. J.W. and Thomas, C. A. and Elfman, M. and Johansson, R. and Hartl, M. and Kocevar, H. and Michel, K. and Joshi, S. and Björklund, S.}},
  issn         = {{0168-583X}},
  keywords     = {{Beam imaging; Chromia alumina; ESS; Luminescent screens; YAG}},
  language     = {{eng}},
  pages        = {{227--233}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms}},
  title        = {{Preliminary results from a study of luminescent materials—For application in the beam imaging system at the ESS}},
  url          = {{http://dx.doi.org/10.1016/j.nimb.2023.04.015}},
  doi          = {{10.1016/j.nimb.2023.04.015}},
  volume       = {{540}},
  year         = {{2023}},
}