Alignment for the first precision measurements at Belle II

Bilka, T.; Abudinen, Jesus; Ackermann, K.; Adamczyk, K.; Ahlburg, P.; Aihara, H.; Alonso, Oscar; Albalawi, Mohammed; Andricek, L.; Ayad, R.; Aziz, T.; Babu, V.; Bacher, S.; Bahinipati, S.; Batignani, G.; Baudot, J.; Behera, P. K.; Bettarini, S.; Boronat, Marça; Bożek, A.; Braun, N.; Buchsteiner, F.; Caldwell, A.; Camien, C.; Casarosa, G.; Červenkov, D.; Chekelian, V.; Chen, Yeqi; Chilikin, K.; Corona, L.; Czank, T.; Das, S.; Dash, N.; Marino, G. de; Deschamps, B.; Diéguez, Ángel; Dingfelder, J.; Doležal, Z.; Dujany, G.; Esperante, D.; Forti, F.; Fras, M.; Frey, A.; Friedl, M.; Fuster, J.; Gabriel, M.; Gadow, Karsten; Ganiev, E.; Gebauer, U.; Geßler, Thomas; Giakoustidis, G.; Gioi, L. Li; Gobbo, B.; Lopez, P. Gomis; Greenwald, D.; Guan, Y. H.; Halder, S.; Hara, K.; Hartbrich, O.; Hazra, S.; Heck, M.; Hemperek, T.; Hensel, M.; Higuchi, T.; Hoek, M.; Huber, S.; Itoh, R.; Irmler, C.; Ishikawa, A.; Jeon, H. B.; Joo, C.; Kaleta, M.; Kaliyar, A. B.; Kandra, J.; Kang, K. H.; Kapusta, P.; Kiesling, C.; Kisielewski, B.; Kittlinger, D.; Kleinwort, C.; Klose, Daniel; Kodyš, P.; Koffmane, Christian; Kohriky, T.; Kono, T.; Konorov, I.; Krivokuca, S.; Krüger, H.; Kuhr, T.; Kumar, M. Anand; Kumar, Rajeev; Kvasnička, P.; Lacasta, C.; Licata, C. La; Lalwani, K.; Lanceri, L.; Lange, J. S.; Lautenbach, K.; Lee, Seungcheol; Leis, U.; Leitl, P.; Levit, D.; Li, Chunhua; Li, Y. B.; Libby, J.; Liemann, Gerhard; Li, Qingyuan; Liu, Zhenan; Lück, Thomas; Luetticke, F.; Macharski, L.; Maity, S.; Mariñas, C.; Mayekar, S. N.; Mccarney, S.; Mohanty, G. B.; Grimaldo, J. A. Mora; Morii, T.; Moser, H. G.; Moya, D.; Müller, F.; Nakamura, K.; Nakao, M.; Natkaniec, Z.; Niebuhr, C.; Ninković, J.; Onuki, Y.; Ostrowicz, W.; Paladino, A.; Paoloni, E.; Park, H.; Park, S.-H.; Paschen, B.; Paul, S.; Perić, I.; Poblotzki, Frauke; Rabusov, A.; Rao, K. K.; Reiter, S.; Richter, R.; Ripp-Baudot, I.; Ritter, M.; Ritzert, M.; Rizzo, G.; Rout, N.; Sahoo, Debashis; Sánchez, J.; Šantelj, L.; Sato, N.; Scavino, B.; Schäller, G.; Schnecke, M.; Schopper, F.; Schreeck, H.; Schwanda, C.; Schwenker, B.; Sedlmeyer, R.; Sfienti, C.; Simon, F.; Skambraks, S.; Soloviev, Y.; Spruck, B.; Stefkova, S.; Stever, R.; Stolzenberg, U.; Suzuki, S.; Takahashi, M.; Tafelmayer, E.; Tanaka, S.; Tanigawa, H.; Thalmeier, R.; Tsuboyama, T.; Uematsu, Y.; Verbycka, O.; Vila, I.; Virto, A. Lopez; Vitale, L.; Vogt, S.; Vos, M.; Wan, Kun; Wang, Qingji; Watanuki, Shun; Webb, J.; Wermes, N.; Wessel, C.; Wiechczynski, J.; Wieduwilt, P.; Windel, H.; Yamada, S.; Ye, Hua; Yin, H.; Zani, L.; Zhang, Tingyu

doi:10.1051/epjconf/202024502023

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…During data-taking, a periodic calibration determines the alignments and surface deformations of the internal components of the PXD and SVD and the relative alignments of the PXD, SVD, and CDC using e + e −collision, beam-background, and cosmic-ray events [24]. Unaccounted-for misalignment can bias the measurement of the charmed decay lengths and hence their decay times.…”

mentioning

confidence: 99%

Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II

Abudinén,

Adachi,

Adamczyk

et al. 2021

Preprint

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mentioning

confidence: 99%

Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II

Abudinén,

Adachi,

Adamczyk

et al. 2021

Preprint

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“…1 Currently, only four sensors are installed in the second layer. 2 The local axes correspond to global coordinates in case of the half-shells 3 With origin at sensor center, w is perpendicular to sensor surface, v (corresponding to the global z-direction for nominal sensor placement) points along the longer and u along the shorter side of the sensor (R − φ-direction). The Central Drift Chamber (CDC) is composed of 56 layers 4 , organized in nine superlayers (with alternating stereo and axial layers) and three main mechanical parts -small cell chamber, conical section and main part, see Fig.…”

Section: Alignment Degrees Of Freedommentioning

confidence: 99%

“…The alignment of the Belle II vertex detector and the drift chamber is unified [3] and solved simultaneously at local and global level. Local level alignment degrees of freedom are parameters of sensors and (optionally) wires.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Global and Local Alignment of the Belle II Tracking Detectors

2021

Self Cite

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The alignment of the Belle II tracking system, composed of a pixel and strip vertex detectors and central drift chamber, is described by approximately sixty thousand parameters; from local alignment of sensors and wires to relative global alignment of the sub-detectors. In the next data reprocessing, scheduled since Spring 2021, we aim to determine all parameters in a simultaneous fit by Millepede II, where recent developments allow to achieve a direct solution of the full problem in about one hour and make it practically feasible for regular detector alignment. The tracking detectors and the alignment technique are described and the alignment strategy is discussed in the context of studies on simulations and experience obtained from recorded data. Preliminary results and further refinements based on studies of real Belle II data are presented.

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Installation of a Cosmic-Ray Trigger System to Commission the Belle II Experiment VerteX Detector with Cosmic Rays

Halawani

Ayad

Albalawi

et al. 2021

Journal of Undergraduate Reports in Physics

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In this paper, we describe the design, construction, testing, and installation of the cosmic ray trigger system used to commission the VerteX Detector (VXD) of the Belle II experiment at the High-Energy Accelerator Research Organization (KEK) in Japan. The system consists of two rows of scintillators; with six scintillators being on top of the VXD, and six at the bottom of it. The scintillators were characterized (plateaus, threshold values, coincidences rate), and when compared with the simulation values a concordant match was found for all cosmic coincidence measurements. In Phase 3 of SuperKEKB accelerator, the VXD was the last sub-detector to be integrated into the heart of Belle II detector, after it was absent from being integrated within Belle II in Phase 1 and Phase 2 of SuperKEKB machine studies. A system consisting of VXD prototype parts had been installed, into Belle II detectors, at the VXD location during Phase 2 to study background and it was found that the VXD can cope with the level of measured background: allowing the VXD to be present during Phase 3 Belle II data taking. The VXD was tested with cosmic rays outside of Belle II before it was integrated within Belle II just before Phase 3 data taking, which commenced in March 2019.

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Alignment for the first precision measurements at Belle II

Cited by 7 publications

References 9 publications

Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II

Precise measurement of the $D^0$ and $D^+$ lifetimes at Belle II

Simultaneous Global and Local Alignment of the Belle II Tracking Detectors

Installation of a Cosmic-Ray Trigger System to Commission the Belle II Experiment VerteX Detector with Cosmic Rays

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