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Automatic system for testing PMT photocathode homogeneity.

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Title: Automatic system for testing PMT photocathode homogeneity.
Authors: Todorov, V.1 (AUTHOR) vtodorov@phys.uni-sofia.bg, Cassette, P.1 (AUTHOR), Georgiev, S.1 (AUTHOR), Sabot, B.2 (AUTHOR), Mitev, K.1 (AUTHOR)
Source: Journal of Radioanalytical & Nuclear Chemistry. Sep2025, Vol. 334 Issue 9, p5919-5931. 13p.
Subjects: Homogeneity, Photomultipliers, Spatial resolution, Liquid scintillators, Photocathodes, Scanning systems, Heat transfer
Abstract: An automatic system for scanning the homogeneity of photomultiplier tubes (PMTs) response was developed, achieving 0.2 mm spatial resolution over a 3.6 × 3.2 cm2 area. Tests revealed global and structural non-homogeneity in compact PMTs (Hamamatsu R7600U-200, H11934-203) and non-homogeneity on the edges of round PMTs (Hamamatsu R9779, R331-05 and Philips XP2020Q). A significant inefficient spot on the XP2020Q was observed, which expanded after defocusing. Heat transfer studies showed square PMTs transfer heat to the photocathode, affecting liquid scintillation cocktail temperature, while round PMTs showed minimal heat exchange. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Radioanalytical & Nuclear Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Automatic system for testing PMT photocathode homogeneity.
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  Data: <searchLink fieldCode="DE" term="%22Homogeneity%22">Homogeneity</searchLink><br /><searchLink fieldCode="DE" term="%22Photomultipliers%22">Photomultipliers</searchLink><br /><searchLink fieldCode="DE" term="%22Spatial+resolution%22">Spatial resolution</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+scintillators%22">Liquid scintillators</searchLink><br /><searchLink fieldCode="DE" term="%22Photocathodes%22">Photocathodes</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+systems%22">Scanning systems</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink>
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  Data: An automatic system for scanning the homogeneity of photomultiplier tubes (PMTs) response was developed, achieving 0.2 mm spatial resolution over a 3.6 × 3.2 cm2 area. Tests revealed global and structural non-homogeneity in compact PMTs (Hamamatsu R7600U-200, H11934-203) and non-homogeneity on the edges of round PMTs (Hamamatsu R9779, R331-05 and Philips XP2020Q). A significant inefficient spot on the XP2020Q was observed, which expanded after defocusing. Heat transfer studies showed square PMTs transfer heat to the photocathode, affecting liquid scintillation cocktail temperature, while round PMTs showed minimal heat exchange. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Radioanalytical & Nuclear Chemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s10967-025-10028-y
    Languages:
      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 5919
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      – SubjectFull: Homogeneity
        Type: general
      – SubjectFull: Photomultipliers
        Type: general
      – SubjectFull: Spatial resolution
        Type: general
      – SubjectFull: Liquid scintillators
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      – SubjectFull: Photocathodes
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      – SubjectFull: Scanning systems
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      – SubjectFull: Heat transfer
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      – TitleFull: Automatic system for testing PMT photocathode homogeneity.
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            NameFull: Georgiev, S.
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              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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