3rd Open Meeting for the Hyper-Kamiokande Project



The Hyper-Kamiokande project is being designed to be the next decade's flagship experiment for the study of neutrino oscillations, nucleon decays, and astrophysical neutrinos.

Following the successful format of the previous meetings, we will hold the 3rd International Open Working Group Meeting for Hyper-Kamiokande. The meeting will be open to all interested scientists and community members.

The slides for the first and second open meetings can be found here;
(1st) http://indico.ipmu.jp/indico/conferenceTimeTable.py?confId=7#all.detailed
(2nd) http://indico.ipmu.jp/indico/conferenceTimeTable.py?confId=10#all.detailed

The goal of this meeting is to further discuss the physics potentials of Hyper-K, the design of the detector, and necessary R&D items including:
  • cavern excavation,
  • tank liner material and its design,
  • photo-sensors and their support structure,
  • DAQ electronics and computers,
  • calibration systems,
  • water purification systems,
  • software development,
  • neutrino beam-line,
  • near detector,
  • physics potentials of Hyper-K, and so on.

Participants are encouraged to submit abstracts for talks in which to present their individual interests in topics specifically related to Hyper-K, as well as discuss possible future contributions to the project.

If you would like to contact the relevant people in our group in advance to discuss the Hyper-K project and its development work, please click the contact information menu on the right side of this page to send an email to us.

We expect that those who are interested in joining the project will come to this meeting. However, the meeting will require prior registration to participate.  Due to capacity constraints at the meeting site we urge all interested parties to register at their earliest possible convenience.

We are looking forward to seeing you in Kashiwa,

Organizing Committee Members:
Yoshinari HAYATO (ICRR), Yusuke KOSHIO (Okayama), Neil MCCAULEY (Liverpool), Akihiro MINAMINO (Kyoto), Shun-ichi MINE (UCI), Makoto MIURA (ICRR), Tsuyoshi NAKAYA (Kyoto), Shoei NAKAYAMA (ICRR), Yasuhiro NISHIMURA (ICRR), Kimihiro OKUMURA (ICRR), Hiroyuki SEKIYA (ICRR), Masato SHIOZAWA (ICRR, chair), Yasuo TAKEUCHI (Kobe), Hidekazu TANAKA (ICRR), Hirohisa TANAKA (UBC), Mark VAGINS (Kavli IPMU), Roger Wendell (ICRR), Masashi YOKOYAMA (Tokyo)


Meeting Photo
  • Akihiro Minamino
  • Akimichi Taketa
  • Akira Konaka
  • Alessandro Bravar
  • Atsuko Ichikawa
  • Atsushi Takeda
  • Benjamin Quilain
  • Bruce BERGER
  • Camillo Mariani
  • Carsten Rott
  • Chris Walter
  • Christophe Bronner
  • Christopher Mauger
  • Claudio Giganti
  • Dave Wark
  • David Hadley
  • Fabrice Retiere
  • Francesca Di Lodovico
  • GONIN Michel
  • Hank Sobel
  • Hide-Kazu TANAKA
  • Hiroaki Aihara
  • hirohisa tanaka
  • Hiroyuki Sekiya
  • In Taek Lim
  • Itaru Shimizu
  • Jae Yool Kim
  • James Stone
  • Javier Caravaca
  • Jia Liu
  • Kevin Connolly
  • Kimihiro Okumura
  • koun choi
  • Kunxian Huang
  • Kyoko Okada
  • Lluis Marti Magro
  • Luis Labarga
  • Makoto Miura
  • Manecki Szymon
  • Marat Khabibullin
  • Marc Bergevin
  • Mark Hartz
  • Mark Rayner
  • Mark Vagins
  • Martin Tzanov
  • Masahiro Kuze
  • Masashi Yokoyama
  • Masato SHIOZAWA
  • Masayuki Nakahata
  • Mayly Sanchez
  • Michael Wilking
  • Motoyasu Ikeda
  • nakajima takeo
  • Nicola Paoli
  • Norihisa Fujioka
  • Patrick de Perio
  • Richard Calland
  • Robert Svoboda
  • Roger Wendell
  • Seiko Hirota
  • Shigenobu Matsuno
  • Sho TADA
  • Shoei Nakayama
  • Shunichi Mine
  • Takaaki Kajita
  • Takatomi Yano
  • Takayuki Ohmura
  • Taku Ishida
  • Toru Iijima
  • Toshifumi Tsukamoto
  • Tsuyoshi NAKAYA
  • Yasuhiro NISHIMURA
  • Yasuo Takeuchi
  • Yoshihiko Kawai
  • Yoshihisa OBAYASHI
  • Yoshinari Hayato
  • Yoshitaka Itow
  • Yuji Okajima
  • Yusuke Koshio
  • Yusuke Suda
    • 08:30 09:00
      • 08:30
        Registration 30m
    • 09:00 09:40
      Opening Session
      • 09:00
        Goals of Meeting 25m
        I will briefly explain discussion items of the meeting.
        Speaker: Prof. Masato SHIOZAWA (The University of Tokyo, Institute for Cosmic Ray Research, ICRR)
      • 09:25
        HK Internal/Domestic situation (HKWG steering group report) 15m
        HKWG steering group report
        Speaker: Prof. Tsuyoshi NAKAYA (Kyoto)
    • 09:40 10:05
      J-PARC and Beamline
      • 09:40
        J-PARC neutrino beam 25m
        The future of J-PARC neutrino beam toward 750 kW and beyond will be reported.
        Speaker: Sho Tada (KEK)
    • 10:05 10:30
      Break 25m
    • 10:30 11:40
      Physics Potential
      • 10:30
        Introduction to physics session 10m
        Speaker: Masashi Yokoyama (University of Tokyo)
      • 10:40
        HK sensitivity with T2K systematic treatment 20m
        The sensitivity of CP measurement using J-PARC beam shown in Hyper-K LOI is calculated with fixed theta_23 and delta m^2_32, and the treatment of systematic uncertainty is very simple. To validate the LOI sensitivity, I will show the sensitivity obtained by fitting 4 oscillation parameters (delta_CP, theta_13, theta_23, and delta m^2_32) with more realistic treatment of the systematic uncertainty based on the actual estimation for T2K. In addition, the effect of the constrained on theta_13 from reactor experiments will be shown.
        Speaker: Dr Motoyasu Ikeda (Kyoto University)
      • 11:00
        Systematic uncertainties in long-baseline neutrino oscillation experiments 20m
        The CP violating effect in the $\nu_\mu\rightarrow \nu_e$ oscillation probability is suppressed with respect to the CP-conserving contribution. Therefore, systematic uncertainties affecting the signal at long baseline oscillation experiments are extremely relevant for the CP violation searches. We will present a phenomenological analysis showing the possible impact that systematic errors may have on long baseline experiments such as T2HK, and comment on which of these uncertainties are expected to have the greatest effect.
        Speaker: Dr Szymon Manecki (VirginiaTech)
      • 11:20
        Near Detector Considerations 20m
        Some considerations regarding the near detectors are presented. With a focus on the physics needs for the Hyper-Kamiokande-based long baseline experiment, the expected future performance, aging and needed refurbishment for the current T2K ND280 detector and possible future ideal near detector setups.
        Speaker: Prof. Francesca Di Lodovico (Queen Mary, University of London)
    • 11:40 13:20
      Lunch / Institute representative meeting 1h 40m
    • 13:20 15:10
      Physics Potential
      • 13:20
        A New Proposal for a Tokai to Hyper-K Near Detector 20m
        In order to maximize the physics potential of a projected 10 year beam running period, systematic uncertainties at the 2% level are required, and the largest source of systematic uncertainty is projected to be from uncertainties on neutrino interaction cross sections. This new near detector proposal aims to significantly reduce the dependence of T2HK measurements on a priori knowledge of neutrino cross sections by utilizing a variety of off-axis angles to empirically determine the relationship between neutrino energy and lepton kinematics.
        Speaker: Dr Michael Wilking (TRIUMF)
      • 13:40
        An application of the neutrino oscillation to geophysics : Study of the Earth's core composition using atmospheric neutrino 20m
        Neutrino oscillations inside matter are sensitive to the electron density. On the other hand, neutrino absorption is sensitive to the mass density. The mass density distribution of the Earth's core is also inferred from seismic tomography. Therefore, neutrino oscillation can be used for a probe to determine the average atomic mass ratio A/Z of the Earth's core by comparing with the mass density. The outer core composition is believed to consist of 90% iron and 10% light material, but it has not been measured yet. With the advent of the new-generation neutrino detector like Hyper-K, neutrino oscillation spectrometry will allow us to constrain directly the composition of the Earth’s outer core.
        Speaker: Dr Akimichi Taketa (Earthquake Research Institute)
      • 14:00
        Spallation background 25m
        A MC based estimation of spallation background in Hyper-K will be reported.
        Speaker: Dr Itaru Shimizu (Tohoku University)
      • 14:25
        SRN search with HK 25m
        The sensitivity of SRN in HK is reported for several cosmic ray intensity case.
        Speaker: Dr Takatomi Yano (Okayama Univ.)
      • 14:50
        Search for the spin-independently coupling WIMP captured in the Sun/the Earth in Hyper-Kamiokande 20m
        WIMP searches using the captured WIMP by terrestrial bodies are characterized by whether the scattering is spin-independent (in which case the WIMP couples to the mass in the nucleus) or spin-dependent (in which case the WIMP couples to the spin of the nucleus). For spin-dependent coupling case, Hyper-K solar analysis is expected to have strongest sensitivity among currently proposed detectors for search for the WIMP with mass below few tens of GeV(C.Rott's talk in 1st open meeting). In 3rd open meeting, I'd like to also present the view of spin-independent coupling case for the Sun and the Earth captured WIMP, where the sensitivity can be compared with claimed signals from several direct detectors and prospects of future detectors.
        Speaker: Ms koun choi (nagoya university)
    • 15:10 15:35
      Break 25m
    • 15:35 16:20
      Cavities and Tanks
      • 15:35
        Hyper-K site and cavern 20m
        I will summarize the cavern design studies and plan of geological survey at Mozumi site. Document plan will be also explained.
        Speaker: Prof. Masato SHIOZAWA (The University of Tokyo, Institute for Cosmic Ray Research, ICRR)
      • 15:55
        Hyper-K tank and photo-sensor support structure 15m
        I will discuss the current status and updates on Hyper-K tank design.
        Speaker: Dr Hide-Kazu TANAKA (ICRR, University of Tokyo)
      • 16:10
        Geomagnetic compensation coils 10m
        I will show some update of the compensation coil study.
        Speaker: Dr Shoei Nakayama (Kamioka Observatory, ICRR, University of Tokyo)
    • 16:20 17:05
      Water System
      • 16:20
        Status of HK water system and HK water quality 25m
        I will talk about water.
        Speaker: Dr Hiroyuki Sekiya (ICRR/IPMU)
      • 16:45
        Status of Gd in 200 tons, 32 ktons, and 560 ktons 20m
        Progress and status of water-related issues concerning gadolinium loading in EGADS (200 tons) will be presented, leading into a discussion on how what is being learned could be applied to Super-K's inner volume (32 ktons) and to Hyper-K (560 ktons) as well.
        Speaker: Prof. Mark Vagins (IPMU)
    • 17:05 17:30
      Break 25m
    • 17:30 19:00
      Parallel Sessions
      • 17:30
        Parallel-1 (Near Detector discussion) 1h 30m
      • 17:30
        Parallel-2 (?) 1h 30m
      • 17:30
        Parallel-3 (?) 1h 30m
    • 09:00 10:20
      • 09:00
        Overview of the photodetector development 10m
        I will present a brief introduction of current activities in the photodetector sub-WG and the plan for the photodetector development.
        Speaker: Dr Shoei Nakayama (Kamioka Observatory, ICRR, The University of Tokyo)
      • 09:10
        Status and plan for photodetector tests in a 200-ton tank 20m
        A proof test of 8-inch HPDs and 20-inch high-QE PMTs using a 200-ton tank starts from this summer at Kamioka mine. These preparation status and a recent R&D of photosensors will be presented.
        Speaker: Dr Yasuhiro NISHIMURA (ICRR, University of Tokyo)
      • 09:30
        Performance evaluation and pre-installation calibrations of prototype photodetectors 15m
        We prepared ten 8-inch HPDs and eight high-QE 20-inch PMTs and a part of them will be installed in a 200-ton tank for a proof-test from this summer. For the installation, a gain adjustment finished and these performance was evaluated to select the photodetectors into the tank.
        Speaker: Seiko Hirota (Kyoto Univ.)
      • 09:45
        Enhanced light collection with a wavelength shifter trap 20m
        The baseline Hyper-K concept relies on 99,000 20” photomultiplier tubes (PMTs) to provide 20% photo-coverage. We are investigating solutions that would enhance the photo-coverage without compromising either contrast or timing resolution. Contrast roughly quantifies the fraction of photons detected that retain the Cerenkov light directional information over the total number of photons detected including photons having scattered, been reflected or reemitted. We are proposing to enclose each PMT within a box allowing direct detection of some of the UV and blue Cerenkov light, while recovering a fraction of the light missing the PMT using a combination of wavelength shifter and dichroic. Simulations shows a factor of 2 to 3 enhancement in photon collection compared to the baseline design. We will show detailed optimization results and the first steps towards building a full scale prototype.
        Speaker: Dr Fabrice Retiere (TRIUMF)
      • 10:05
        R&D of light collection system using acrylic lens 15m
        In the current beseline design, the photo-coverage of the HK inner tank is 20%. For the low energy neutrino measurement (for example, a precise measurement of the solar neutrino spectrum or a measurement of the day-night asymmetry of the solar neutrino flux), higher photo-coverage is desirable. This R&D is to enlarge the effective photo-coverage using light collection system. I will show the current status of test measurements for a commercially available 30cm*30cm acrylic Fresnel lens.
        Speaker: Dr Motoyasu Ikeda (Kyoto University)
    • 10:20 10:45
      Break 25m
    • 10:45 11:05
      • 10:45
        Using Fast Photosensors in the Next Generation Water Cherenkov Neutrino Detectors 20m
        The next generation of neutrino experiments will require massive and high resolution detectors to reach the sensitivity needed to measure CP violation in the lepton sector and the neutrino mass hierarchy. New photodetectors based on micro-channel plates are being developed by the Large-Area Picosecond Photo Detector (LAPPD) Collaboration. These photosensors have shown potential for excellent spatial and timing resolution. The application of these developments in photodetector technology to large water Cherenkov detectors could enhance background rejection and vertex resolution by using the gains in spatial and timing information. We describe briefly the status of the LAPPD development and show preliminary results on the reconstruction capabilities for single particles in a 200-kton size water Cherenkov detector.
        Speaker: Prof. Mayly SANCHEZ (Iowa State University)
    • 11:05 11:25
      DAQ and Electronics System
      • 11:05
        R&D items of the DAQ system in HK 20m
        Show the necessary R&D items and status of the discussions ( could be short )
        Speaker: Dr Yoshinari Hayato (Kamioka obs., ICRR, Univ. of Tokyo)
    • 11:25 11:45
      Physics Potential
      • 11:25
        theta_23 and delta can be measured accurately at the same time 20m
        Speaker: Prof. Hisakazu Minakata
    • 11:45 13:25
      Lunch 1h 40m
    • 13:25 14:35
      • 13:25
        Overview and WCsim with the real HK geometry 20m
        The current activities of the software group will be reviewd as amn introduction of the software session. WCsim is a water cherenkov detector simulater which can generate cylindrical detector configuration, on the other hand, HyperK has "egg shape" cross section. We tried to include this complicated geometry into WCsim and some vlidation work will be presented.
        Speaker: Prof. Chris Walter (Duke University)
      • 13:45
        Development of WCsim and optimization detecor parameters 20m
        Recent developing works about WCsim will be presented. We generated simulations with several detector length to optimize the detector performance.
        Speaker: Mr Yuji Okajima (Tokyo Institute of Technology)
      • 14:05
        fiTQun and interface for WCsim 20m
        Recent progress about fiTQun will be reported. The fiTQun was originally developed for Super-K analysis and some interface is needed to run for WCsim output. The interface between fiTQun and WCsim will be discussed.
        Speaker: Patrick DE PERIO (University of Toronto)
      • 14:25
        Prospects and plans for software 10m
        The optimization of detector parameters are important to decide the detector design. Some ideas for optimization and plan will be discussed.
        Speaker: Dr Makoto Miura (Kamioka Observatory, ICRR, University of Tokyo)
    • 14:35 15:00
      Break 25m
    • 15:00 16:15
      Detector Calibrations
      • 15:00
        Overview and plan for Hyper-K calibration 15m
        I will discuss overview of current status and prototyping / R&D plans for Hyper-K calibration.
        Speaker: Dr Hide-Kazu TANAKA (ICRR, University of Tokyo)
      • 15:15
        OD calibration 15m
        The outer detector of the Hyper-Kamikande detector needs some way to calibrate their sensor response against known light source. The detail of Super-Kamiokande OD calibration system is presented as an example of such a system. A smilar system for the HK detector will be descussed along with a rough estimation of its cost.
        Speaker: Dr Shigenobu Matsuno (University of Hawaii)
      • 15:30
        Facility to measure PMT properties 15m
        A facility to measure the response and reflective properties of PMTs (and other materials) in water is under construction at TRIUMF. Through two manipulator arms, collimated and polarize laser light at various wavelengths can be directed at the PMT (or other sample) from a large range of position and angles, with reflected light detected by a photosensor on the other arm. The facility includes Helmholtz compensation coils and shielding to reduce ambient magnetic fields and a vessel to allow measurements in water.
        Speaker: Mr Hirohisa A. Tanaka (University of British Columbia/Institute of Particle Physics)
      • 15:45
        Calibration-source positioning system 15m
        This will be a review of the calibration (insertion) system for the Hyper-K detector. The talk will cover current status and design concept of the hardware as well as details regarding the CCD-source-positioning system incorporated from the Borexino design.
        Speaker: Dr Szymon Manecki (VirginiaTech)
      • 16:00
        new calibration source R&D 15m
        The status of the development of new calibration source R&D for Hyper-K.
        Speaker: Dr Yusuke Koshio (Okayama university)
    • 16:15 16:40
      Break 25m
    • 16:40 17:00
      Summary of Near Detector discussion
      • 16:40
        Summary of near detector discussion 20m
        Summary of near detector discussion
        Speaker: Dr Mark Hartz (Kavli IPMU)
    • 17:00 18:00
      • 17:00
        Discussions 50m
      • 17:50
        Meeting photo 5m
      • 17:55
        NNN13 5m
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