The silicon vertex detector of the Belle II experiment

被引：0

作者：

Gabrielli, A. ^{[10
,13
]}

Adamczyk, K. ^{[18
]}

Aihara, H. ^{[16
]}

Bacher, S. ^{[18
]}

Bahinipati, S. ^{[5
]}

Baudot, J. ^{[4
]}

Behera, P. k. ^{[6
]}

Bettarini, S. ^{[11
]}

Bilka, T. ^{[2
]}

Bozek, A. ^{[18
]}

Buchsteiner, F. ^{[1
]}

Casarosa, G. ^{[10
]}

Corona, L. ^{[11
]}

Das, S. b. ^{[7
]}

Dujany, G. ^{[4
]}

Finck, C. ^{[4
]}

Forti, F. ^{[11
]}

Friedl, M. ^{[1
]}

Gobbo, B. ^{[13
]}

Halder, S. ^{[9
]}

Hara, K. ^{[14
]}

Hazra, S. ^{[9
]}

Higuchi, T. ^{[15
]}

Irmler, C. ^{[1
]}

Ishikawa, A. ^{[14
]}

Jin, Y. ^{[13
]}

Kaleta, M. ^{[18
]}

Kaliyar, A. b. ^{[1
]}

Kandra, J. ^{[2
]}

Kang, K. h. ^{[15
]}

Kodys, P. ^{[2
]}

Kohriki, T. ^{[17
]}

Kumar, R. ^{[8
]}

Lalwani, K. ^{[7
]}

Lautenbach, K. ^{[3
,11
]}

Leboucher, R. ^{[3
]}

Libby, J. ^{[6
]}

Martel, L. ^{[4
]}

Massaccesi, L. ^{[10
]}

Mohanty, G. b. ^{[9
]}

Mondal, S. ^{[11
]}

Nakamura, K. r. ^{[14
]}

Natkaniec, Z. ^{[18
]}

Onuki, Y. ^{[16
]}

Otani, F. ^{[15
]}

Paladino, A. ^{[11
,19
]}

Paoloni, E. ^{[11
]}

Rao, K. k. ^{[9
]}

Ripp-baudot, I. ^{[4
]}

Rizzo, G. ^{[11
]}

机构：

[1] Austrian Acad Sci, Inst High Energy Phys, A-1050 Vienna, Austria

[2] Charles Univ Prague, Fac Math & Phys, Prague 12116, Czech Republic

[3] Aix Marseille Univ, CNRS, CPPM, IN2P3, F-13288 Marseille, France

[4] Univ Strasbourg, CNRS, UMR 7178, IPHC, F-67037 Strasbourg, France

[5] Indian Inst Technol Bhubaneswar, Bhubaneswar 752050, India

[6] Indian Inst Technol Madras, Chennai 600036, India

[7] Malaviya Natl Inst Technol Jaipur, Jaipur 302017, India

[8] Punjab Agr Univ, Ludhiana 141004, India

[9] Tata Inst Fundamental Res, Mumbai 400005, India

[10] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy

[11] INFN Sez Pisa, I-56127 Pisa, Italy

[12] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[13] INFN Sez Trieste, I-34127 Trieste, Italy

[14] Grad Univ Adv Studies SOKENDAI, Hayama 2400193, Japan

[15] Univ Tokyo, Kavli Inst Phys & Math Universe, Kashiwa 2778583, Japan

[16] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[17] High Energy Accelerator Res Org KEK, Tsukuba 3050801, Japan

[18] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[19] INFN Sez Bologna, I-40127 Bologna, Italy

[20] INFN Sez Roma Tre, I-00185 Rome, Italy

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2024年 / 1064卷

基金：

欧洲研究理事会;

关键词：

Belle II; Vertex detector; Silicon strip detector; Tracking; High-luminosity;

D O I：

10.1016/j.nima.2024.169401

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The silicon vertex detector (SVD) is a four-layer double-sided strip detector installed at the heart of the Belle II experiment, taking data at the high-luminosity B-Factory SuperKEKB since 2019. SVD has been operating smoothly and reliably, showing a stable and above-99% hit efficiency, and a large signal-to-noise ratio in all sensors. In June 2022 the data-taking of the Belle II experiment was stopped for the Long Shutdown 1, primarily required to complete the vertex detector (VXD) with the inner two-layer DEPFET detector and to upgrade several components of the accelerator. This article reports on the excellent performance of SVD in terms of the signal-to-noise ratio, the hit position resolution, as well as the hit -time resolution. We briefly describe the challenges and delicate phases of the VXD re-installation and the SVD status for operation starting in early 2024. In SVD layer 3, which is closest to the interaction point, the average occupancy has been less 0.5%, well below the estimated limit for acceptable tracking performance. However, higher machine backgrounds are expected at increased luminosity, and so also increased hit occupancy. To enhance the robustness of offline software in a high-background environment, new algorithms of background suppression using the excellent SVD hit -time information have been developed, which allows a significant reduction of the fake rate, while preserving the tracking efficiency. With the increasing luminosity also the radiation levels are expected to increase, with possible deterioration of the sensor performance. The SVD integrated dose is estimated by the correlation of the SVD occupancy with the dose rate measured by the diamonds of the radiation monitor and beam-abort system. The effects of radiation damage are starting and in good agreement with our expectations. So far, no harmful impact due to the radiation damage on the detector performance has been observed.

引用

页数：5

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