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Preliminary results from a study of luminescent materials: For application in the beam imaging system at the ESS
Department of Physics and Astronomy, Uppsala University, Uppsala (SWE); Department of Physics, Lund University, Lund (SWE).
Accelerator Division, European Spalation Source (ESS), Lund (SWE).
Department of Physics, Lund University, Lund (SWE).
Accelerator Division, European Spalation Source (ESS), Lund (SWE).
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2023 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 540, p. 227-233Article in journal (Refereed) Published
Abstract [en]

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 a2.55 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. 

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 540, p. 227-233
Keywords [en]
ESS, Beam imaging, Luminescent screens, Chromia alumina, YAG
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20300DOI: 10.1016/j.nimb.2023.04.015ISI: 001001818100001Scopus ID: 2-s2.0-85156268474OAI: oai:DiVA.org:hv-20300DiVA, id: diva2:1779346
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Available from: 2023-07-04 Created: 2023-07-04 Last updated: 2024-01-12Bibliographically approved

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Joshi, Shrikant V.Björklund, Stefan

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