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Author  |
Belle-II DEPFET and PXD Collaborations (Ahlburg, P. et al); Marinas, C. |
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Title |
The new and complete Belle II DEPFET pixel detector: Commissioning and previous operational experience |
Type |
Journal Article |
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Year |
2024 |
Publication |
Nuclear Instruments & Methods in Physics Research A |
Abbreviated Journal |
Nucl. Instrum. Methods Phys. Res. A |
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Volume |
1068 |
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Pages |
169763 - 6pp |
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Keywords |
Belle II; DEPFET; Pixel detector; Vertex detector |
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Abstract |
The Belle II experiment at the SuperKEKB collider in Tsukuba, Japan, has collected e+e- + e – collision data between 2019 and 2022. After reaching a record-breaking instantaneous luminosity of 4.71x1034 . 71x10 34 cm -2 s -1 and recording a dataset corresponding to 424 fb -1 , it completed its first planned long shutdown phase in December 2023. Aside from upgrades of the collider and detector maintenance, the shutdown was used for the installation of the two-layer Pixel VerteX Detector (PXD). As the innermost sub-detector, multiple scattering effects need to be reduced. PXD utilizes the Depleted P-channel Field Effect Transistor (DEPFET) technology, allowing for a material budget of 0.21% X0 0 per layer. Each of the tracker's 40 modules consists of an array of 250x768 pixels with a pitch ranging from 50 μmx 55 μm for the inner to 85 μmx 55 μm for the outer layer yielding high gain and high signal-to-noise ratio while retaining about 99% hit efficiency. This article discusses the experience of the 4-year operation of the previous single-layer PXD in harsh background conditions as well as commissioning and testing of the fully-populated PXD2 during Long Shutdown 1. |
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Address |
[Ahlburg, P.; Bernlochner, F.; Dingfelder, J.; Farkas, R.; Giakoustidis, G.; Khan, M.; Krueger, H.; Paschen, B.; Schmitz, J.; Wermes, N.] Univ Bonn, D-53115 Bonn, Germany, Email: jannes.schmitz@uni-bonn.de |
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Publisher |
Elsevier |
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Language |
English |
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Original Title |
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Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0168-9002 |
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Notes |
WOS:001306604900001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6252 |
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