Preface to the 31st International Workshop on VertexDetectors, VERTEX2022
Kazuhiko Hara
Faculty of Pure and Applied Sciences and Tomonaga Center for the History of the Universe,
University of Tsukuba, 1-1-1 Ten’nodai, Tsukuba Ibaraki 305-8571, Japan
E-mail: hara@hep.px.tsukuba.ac.jp(Received January 5, 2023)

The International Workshop on Vertex Detectors (VERTEX) is a major annual series of international workshops for physicists and engineers from the high-energy and nuclear physics community.
VERTEX provides an international opportunity to exchange the experiences and needs of the community and to review recent, ongoing, and future studies on mainly silicon-based vertex detectors. Theworkshop covers various topics: existing and future detectors, new developments, radiation hardness,simulations, tracking and vertexing, electronics and triggering, and applications to medical and otherﬁelds.
The 31st edition of the series, VERTEX2022, was held at Tateyama Resort Hotel, Japan, fromOctober 24 to 28, 2022. The previous two workshops were held online because of the COVID-19
pandemic; therefore, the workshop was returned to the original style after two years. The InternationalAdvisory Committee (IAC) and Local Organizing Committee (LOC) listed at the end decided on
July 1 that the workshop would be conducted onsite despite the restrictions at the time, such as visa
requirements and limits to the number of inbounds per day. We were pleased that both restrictions
were removed on October 11, but that was after most international participants had obtained theirvisas to Japan.
VERTEX workshops used to be a one-week event, from Monday morning to Friday noon. The
last two online workshops were held for four days, limited to four hours each day and considering thediﬀerent time zones. The VERTEX2022 workshop program, initially intended for the online style,
was adjusted for the onsite style. The 36 invited speakers from various experimental and R & D
groups were the core of the presentations. We received abstracts as open contributions, which wereadded as 17 short 15-minute presentations. The program covered reports on the current and upgraded
detectors of extensive experiments conducted at the CERN LHC and Belle II, KEK SuperKEKB. A
couple of sessions were dedicated to monolithic detectors, timing detectors, ASICs, non-HEP andfuture collider experiments, and radiation hard-diamond and SiC detectors. K. Hara, a member of theIAC and the LOC Chair, presented a summary of the workshop activities..
There were 67 participants in total, and most traveled from overseas. For the workshop excursion,
the participants experienced producing a handwritten copy of a sutra at Tanjyo-ji Temple which memories the Holy Priest, Nichiren, and celebrated the 800th anniversary of his birth. After their spirits
were puriﬁed, they enjoyed the sights of sea animals at Kamogawa Sea World. The water splash by
Killer Whales was astonishing, also purifying the spectators bodies. The puriﬁed substances wereset back as usual in the evening at Izaka-ya dinner.
We sincerely thank all the participants, particularly the presenters whose presentations were of thehighest quality. The workshop was cohosted by the Tomonaga Center for the History of the Universe(University of Tsukuba). We also acknowledge the ﬁnancial support provided by Kakenhi Grants#19H04393 (K. Hara), #21H01099A (K. Nakamura), #19H00692 (T. Tsuboyama) and #22H00144
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(A. Ishikawa), and the sponsorship provided by Tsukuba Innovation Arena (TIA), Hamamatsu Photonics K.K., Hayashi Repic Co., Ltd., Tohoku-MicroTec Co., Ltd., and Yamashita Materials Corporation.

Worshop photo at Tateyama Resort Hotel

Excursion: Killer Whale Show and Copy of a sutra

January 5, 2023

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International Advisory Committee:
Marina Artuso (Syracuse Univ),
Prafulla Behera (IIT Madras),
Gian Mario Bilei (INFN Perugia),
Daniela Bortoletto (Univ of Oxford),
Richard Brenner (Uppsala Univ),
Paula Collins (CERN),
Zdenek Dolezal (Charles Univ Prague),Lars Eklund (Univ of Glasgow),
Francesco Forti (Univ and INFN Pisa),
Kazuhiko Hara (Univ of Tsukuba),
Roland Horisberger (PSI),
Manfred Krammer (CERN),
Hans-Guenther Moser (MPI for Physics),
Hwanbae Park (Kyungpook Univ),
Chris Parkes (Univ of Manchester),
Sally Seidel (Univ of New Mexico),Andrey Starodumov (RBI, Zagreb),
Dong Su (SLAC),
Ivan Vila (IFCA Santander).
Local Organizing Committee:
Kazuhiko Hara (Univ, of Tsukuba, chair),
Akimasa Ishikawa (KEK, co-chair),
Koji Hara (KEK),
Tsutomu Mibe (KEK),
Koji Nakamura (KEK),
Yoshiyuki Onuki (Univ. of Tokyo),
Toru Tsuboyama (KEK).

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