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Advanced technologies for future large-scale neutrino experiments

Session chair: Nakadaira , Takeshi (High Energy Accelerator Research Organization Institute of Particle and Nuclear Studies, Tsukuba, Japan); Ishitsuka , Masaki (Tokyo University of Science Department of Physics, Tokyo, Japan)
Shortcut: WS-02
Date: Sunday, 17 October, 2021, 7:00 AM - 11:00 AM
Room: WS-02
Session type: Workshop

Neutrinos are elementary particles that are considered to be deeply related to the creation of matter and the annihilation of antimatter in the early universe. For the precise measurement of the neutrino oscillation that is one of the most important phenomena, the large-scale projects with the giant detectors and high intensity neutrino beams produced from the proton accelerators are in progress. 

Workshop of ‘advanced technologies for future large-scale neutrino experiments’ will review the core technologies in the future projects. The workshop starts from introduction to the neutrino physics and future projects, followed by the focused talks on the technological topics, such as the high intensity accelerator and the control and monitoring systems, development of the high performance and high pressure tolerant photosensors, electronics and data acquisition systems in the giant detectors, and the development of large-scale tracking detector using liquid argon. The goals of the workshop are to introduce the new technologies which are essential to realize the future projects and to facilitate the discussion for further improvements and idea of new experimental project based on the technologies.

Workshop organizers

  • Takeshi NAKADAIRA, High Energy Accelerator Research Organization
  • Masaki ISHITSUKA, Tokyo University of Science


Click on an contribution to preview the abstract content.

7:00 AM WS-02-01

Future projects with giant neutrino detector (#1596)

K. Scholberg1

1 Duke University, Department of Physics, Durham, North Carolina, United States of America


Worldwide there are several initiatives to explore the neutrino sector, and to search for beyond-the-standard-model physics, that make use of giant -- kiloton to megaton scale-- detectors. Multiple technologies are under development for these detectors, including water Cherenkov, liquid argon and liquid-scintillator-based technologies. I will give an overview of these future projects, their physics reach, and challenges that will need to be overcome.

AcknowledgmentThe speaker's research is supported by the Department of Energy and the National Science Foundation.
Keywords: giant neutrino detector
7:25 AM WS-02-02

Accelerator based neutrino beam source - High intensity proton accelerator for neutrino production (#1597)

Y. Kurimoto1

1 tbd, Tokai-Mura, Japan


Long baseline neutrino experiments highly rely on their primary proton beams in terms of the proton intensity. At Fermilab in US, Proton Improvement Plan-II (PIP-II) has been developed to provide proton beams at the intensity of 1.2 MW at the beginning of the operation of Long Baseline Neutrino Facility (LBNF) and more than 2 MW beams further in the future. The PIP-II involves the implementation of a new 800 MeV superconducting linac to Fermilab’s accelerator complex such as Booster, Recycler and Main Injector. On the other hand, at J-PARC (Japan Proton Accelerator Research Complex), the upgrade of the Main Ring has been performed. The J-PARC Main Ring aims at providing 1.3 MW beams for Hyper-Kamiodande. They will shorten the period of the synchrotron cycle from 2.48 to 1.16 seconds by renewing the power converters for the electromagnets and adding the accelerating RF cavities. Especially, the new power converters are now being installed during the special long shutdown period starting from Jul. 2021. In this presentation, we will not only review these activities for higher intensity proton beams but also describe the technologies implemented in the new power converters for the J-PARC Main Ring.

Keywords: neutrino
7:55 AM WS-02-03

Accelerator based neutrino beam source - Neutrino beam production and the detectors for neutrino beam monitoring (#1598)

J. Paley1

1 Fermilab Neutrino Division, Batavia, Illinois, United States of America



Keywords: neutrino
8:25 AM WS-02-04


8:35 AM WS-02-05

Liquid Argon TPC and electronics for giant neutrino detector - Development of the DUNE detector (#1645)

N. Ilic1

1 University of Tronto, Tronto, Canada



Keywords: Liquid Argon TPC, DUNE
9:05 AM WS-02-06

Photo-sensor and electronics for giant neutrino detector - Photosensors for the water Cherenkov neutrino detector (Hyper Kamiokande) (#1599)

Y. Nishimura1

1 Keio University, Tokyo, Japan


Neutrino research has a potential to approach the full picture of elementary particle physics. Some of neutrino properties have not yet been clarified due to their weak interactions and light mass. With large amounts of water, Kamiokande achieved the first observation of astronomical neutrinos and Super-Kamiokande discovered neutrino oscillation. A next generation water Cherenkov detector, Hyper-Kamiokande, will survey remained mysteries such as the CP violation of neutrinos, that is a combination of matter/antimatter and parity asymmetries. The construction started in the year 2020 with the effective target mass as 8.4 times large as that of Super-Kamiokande, and with the improved photon detection performance by new photosensors. By developing three candidates of amplification system in photosensors, we successfully improved the performance of detection efficiency, timing and photon counting resolutions, response uniformity, mechanical strength and contamination of radioactive purities. A new 50 cm photomultiplier tube (PMT) was accomplished with double the performance of photosensors in Super-Kamiokande, whose production started in 2020. As a part of 40,000 photosensors, we also plan to use a multi-PMT module with 19 channels of 8 cm diameter PMTs in a 50 cm diameter vessel to enhance the detection precision. For tagging of cosmic-ray backgrounds at the other outer surrounding layer in the water tank, about 10,000 PMTs of an 8 cm diameter size attached to wavelength shifting plates are being studied. With the advanced technologies of photon detections, Hyper-Kamiokande aims at the observation start from 2027. Design and improvement of the photosensors for Hyper-Kamiokande will be reported in the presentation.

Keywords: neutrino
9:35 AM WS-02-07

Photo-sensor and electronics for giant neutrino detector - Photosensors for the South Pole neutrino observatory (IceCube and IceCube-Gen2) (#1600)

A. Ishihara1

1 Chiba University, Physics Department, Chiba, Japan


The IceCube Neutrino Observatory, a cubic-kilometer-scale neutrino detector at the geographic South Pole has reached a number of milestones in the field of neutrino astrophysics. IceCube uses glacial ice as a Cherenkov medium for the detection of secondary charged particles produced by neutrino interactions with the Earth. Then the distribution of Cherenkov light measured with an array of 5160 optical sensors (DOMs) determines the energy, direction, and flavor of incoming neutrinos. Although the South Pole is considered one of the world’s most harsh environments, 98.5% of modules still taking data after more than 10 years of continuous operations. The IceCube Upgrade is the next stage of the IceCube project. The IceCube Upgrade, to be realized in a few years, consists of seven columns of newly developed photosensors, densely embedded near the bottom center of the existing IceCube array. Furthermore, IceCube-Gen2, currently under development, will consist of approximately 8 km^3 of instrumented ice and an array of approximately 10,000 optical sensors at the South Pole, to significantly enhance the neutrino source detection sensitivity. The upgrade array will be a testbed for a large scale array of Gen2 optical modules. We report on our experiences with the IceCube photodetectors, the performance and production status of new otpical sensors for the Upgrade. Planned photon sensors for a next-generation neutrino facility at the South Pole, IceCube-Gen2 are also presented.

Keywords: neutrino
10:05 AM WS-02-08

Photo-sensor and electronics for giant neutrino detector - Photosensors for the liquid scintillator neutrino detector (JUNO) (#1601)

W. Wang1

1 Sun Yat-sen University, Zhuhai, China



Keywords: neutrino

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