The impact of helium exposure on the PMTs of the SuperNEMO experiment
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00384173" target="_blank" >RIV/68407700:21340/25:00384173 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21670/25:00384173
Result on the web
<a href="https://doi.org/10.1088/1748-0221/20/06/P06018" target="_blank" >https://doi.org/10.1088/1748-0221/20/06/P06018</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1748-0221/20/06/P06018" target="_blank" >10.1088/1748-0221/20/06/P06018</a>
Alternative languages
Result language
angličtina
Original language name
The impact of helium exposure on the PMTs of the SuperNEMO experiment
Original language description
The performance of Hamamatsu 8” photomultiplier tubes (PMTs) of the type used in the SuperNEMO neutrinoless double-beta decay experiment (R5912-MOD), is investigated as a function of exposure to helium (He) gas. Two PMTs were monitored for over a year, one exposed to varying concentrations of He, and the other kept in standard atmospheric conditions as a control. Both PMTs were exposed to light signals generated by a 207Bi radioactive source coupled to a plastic scintillator, which provided consistent large input PMT signals similar to those that are typical of the SuperNEMO experiment. The energy resolution of PMT signals corresponding to 1 MeV energy scale determined from the 207Bi decay spectrum, shows a negligible degradation with He exposure; however the rate of after-pulsing shows a clear increase with He exposure, which is modelled and compared to diffusion theory. A method for reconstructing the partial pressure of He within the PMT and a method for determining the He breakdown point, are introduced. The implications for long-term SuperNEMO operations are briefly discussed.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
<a href="/en/project/LM2023063" target="_blank" >LM2023063: Laboratoire Souterrain de Modane – participation of the Czech Republic</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Instrumentation
ISSN
1748-0221
e-ISSN
1748-0221
Volume of the periodical
20
Issue of the periodical within the volume
6
Country of publishing house
IT - ITALY
Number of pages
19
Pages from-to
1-19
UT code for WoS article
001517223700001
EID of the result in the Scopus database
2-s2.0-105009626305