Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment
During the commissioning of the first of the two detectors of the Double Chooz experiment, an unexpected and dominant background caused by the emission of light inside the optical volume has been observed. A specific study of the ensemble of phenomena called Light Noise has been carried out in-situ,...
| Main Authors: | , , |
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| Format: | Article |
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IOP Publishing
2019
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| Online Access: | http://hdl.handle.net/1721.1/120960 https://orcid.org/0000-0002-6393-0438 |
| _version_ | 1826194505759457280 |
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| author | Conrad, Janet Marie Spitz, Joshua B. Terao, Kazuhiro |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Conrad, Janet Marie Spitz, Joshua B. Terao, Kazuhiro |
| author_sort | Conrad, Janet Marie |
| collection | MIT |
| description | During the commissioning of the first of the two detectors of the Double Chooz experiment, an unexpected and dominant background caused by the emission of light inside the optical volume has been observed. A specific study of the ensemble of phenomena called Light Noise has been carried out in-situ, and in an external laboratory, in order to characterize the signals and to identify the possible processes underlying the effect. Some mechanisms of instrumental noise originating from the PMTs were identified and it has been found that the leading one arises from the light emission localized on the photomultiplier base and produced by the combined effect of heat and high voltage across the transparent epoxy resin covering the electric components. The correlation of the rate and the amplitude of the signal with the temperature has been observed. For the first detector in operation the induced background has been mitigated using online and offline analysis selections based on timing and light pattern of the signals, while a modification of the photomultiplier assembly has been implemented for the second detector in order to blacken the PMT bases. |
| first_indexed | 2024-09-23T09:57:09Z |
| format | Article |
| id | mit-1721.1/120960 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:57:09Z |
| publishDate | 2019 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1209602022-09-30T17:56:45Z Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment Conrad, Janet Marie Spitz, Joshua B. Terao, Kazuhiro Massachusetts Institute of Technology. Department of Physics Conrad, Janet Marie Spitz, Joshua B. Terao, Kazuhiro During the commissioning of the first of the two detectors of the Double Chooz experiment, an unexpected and dominant background caused by the emission of light inside the optical volume has been observed. A specific study of the ensemble of phenomena called Light Noise has been carried out in-situ, and in an external laboratory, in order to characterize the signals and to identify the possible processes underlying the effect. Some mechanisms of instrumental noise originating from the PMTs were identified and it has been found that the leading one arises from the light emission localized on the photomultiplier base and produced by the combined effect of heat and high voltage across the transparent epoxy resin covering the electric components. The correlation of the rate and the amplitude of the signal with the temperature has been observed. For the first detector in operation the induced background has been mitigated using online and offline analysis selections based on timing and light pattern of the signals, while a modification of the photomultiplier assembly has been implemented for the second detector in order to blacken the PMT bases. 2019-03-14T17:40:45Z 2019-03-14T17:40:45Z 2016-08 2016-04 2019-03-14T14:11:08Z Article http://purl.org/eprint/type/JournalArticle 1748-0221 http://hdl.handle.net/1721.1/120960 Abe, Y. et al. “Characterization of the Spontaneous Light Emission of the PMTs Used in the Double Chooz Experiment.” Journal of Instrumentation 11, 8 (August 2016): P08001–P08001 © 2016 IOP Publishing Ltd and Sissa Medialab https://orcid.org/0000-0002-6393-0438 http://dx.doi.org/10.1088/1748-0221/11/08/P08001 Journal of Instrumentation Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing arXiv |
| spellingShingle | Conrad, Janet Marie Spitz, Joshua B. Terao, Kazuhiro Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment |
| title | Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment |
| title_full | Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment |
| title_fullStr | Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment |
| title_full_unstemmed | Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment |
| title_short | Characterization of the spontaneous light emission of the PMTs used in the Double Chooz experiment |
| title_sort | characterization of the spontaneous light emission of the pmts used in the double chooz experiment |
| url | http://hdl.handle.net/1721.1/120960 https://orcid.org/0000-0002-6393-0438 |
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