3rd Open Meeting for the Hyper-Kamiokande Project

21 Jun 2013, 08:00 → 22 Jun 2013, 20:00 Asia/Tokyo

Overview

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/conferenceTimeTable.py?confId=7#all.detailed
(2nd) http://indico.ipmu.jp/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)

hk201306@km.icrr.u-tokyo.ac.jp

 

Meeting Photo IMG_6006.JPG

Friday, 21 June

08:30 → 09:00 Registration

08:30 Registration

09:00 → 09:40 Opening Session

09:00 Goals of Meeting

I will briefly explain discussion items of the meeting.

Speaker: Prof. Masato SHIOZAWA (The University of Tokyo, Institute for Cosmic Ray Research, ICRR)

Slides 130621-Shiozawa-Goals-v1.0.pdf

09:25 HK Internal/Domestic situation (HKWG steering group report)

HKWG steering group report

Speaker: Prof. Tsuyoshi NAKAYA (Kyoto)

Slides HKWG-SC20130621.pdf

09:40 → 10:05 J-PARC and Beamline

09:40 J-PARC neutrino beam

The future of J-PARC neutrino beam toward 750 kW and beyond will be reported.

Speaker: Sho Tada (KEK)

Slides JPARC130621.pdf

10:05 → 10:30 Break

10:30 → 11:40 Physics Potential

10:30 Introduction to physics session

Speaker: Masashi Yokoyama (University of Tokyo)

Slides phys-intro.pdf

10:40 HK sensitivity with T2K systematic treatment

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)

Slides title.pdf

11:00 Systematic uncertainties in long-baseline neutrino oscillation experiments

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)

Slides coloma-manecki.pdf

11:20 Near Detector Considerations

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)

Slides HKJune2013_Francesca.pdf

11:40 → 13:20 Lunch / Institute representative meeting

13:20 → 15:10 Physics Potential

13:20 A New Proposal for a Tokai to Hyper-K Near Detector

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)

Slides HyperKNearDetector.pdf

13:40 An application of the neutrino oscillation to geophysics : Study of the Earth's core composition using atmospheric neutrino

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)

Slides HKmeeting_20130621_taketa.pptx.pdf

14:00 Spallation background

A MC based estimation of spallation background in Hyper-K will be reported.

Speaker: Dr Itaru Shimizu (Tohoku University)

Slides SpallationBackground.pdf

14:25 SRN search with HK

The sensitivity of SRN in HK is reported for several cosmic ray intensity case.

Speaker: Dr Takatomi Yano (Okayama Univ.)

Slides HKCM_tyano_130621_ver3.pdf

14:50 Search for the spin-independently coupling WIMP captured in the Sun/the Earth in Hyper-Kamiokande

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)

Slides 130621_HK.pdf

15:10 → 15:35 Break

15:35 → 16:20 Cavities and Tanks

15:35 Hyper-K site and cavern

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)

Slides 130621-Shiozawa-Excavation-v1.0.pdf

15:55 Hyper-K tank and photo-sensor support structure

I will discuss the current status and updates on Hyper-K tank design.

Speaker: Dr Hide-Kazu TANAKA (ICRR, University of Tokyo)

Slides tanaka_liner_pmt_20130621.pdf

16:10 Geomagnetic compensation coils

I will show some update of the compensation coil study.

Speaker: Dr Shoei Nakayama (Kamioka Observatory, ICRR, University of Tokyo)

Slides 130621-Nakayama-coils.pdf

16:20 → 17:05 Water System

16:20 Status of HK water system and HK water quality

I will talk about water.

Speaker: Dr Hiroyuki Sekiya (ICRR/IPMU)

Slides HK-Water-sekiya.pptx

16:45 Status of Gd in 200 tons, 32 ktons, and 560 ktons

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)

Slides Gad_HK_3rd.ppt

17:05 → 17:30 Break

17:30 → 19:00 Parallel Sessions

17:30 Parallel-1 (Near Detector discussion)

17:30 Parallel-2 (?)

17:30 Parallel-3 (?)

Saturday, 22 June

09:00 → 10:20 Photo-detectors

09:00 Overview of the photodetector development

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)

Slides 130622-Nakayama-HKPDintro.pdf

09:10 Status and plan for photodetector tests in a 200-ton tank

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)

Slides 20130622_PDtests_in_tank_Nishimura.pdf

09:30 Performance evaluation and pre-installation calibrations of prototype photodetectors

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.)

Slides 20130622_PDCalibration_hirota.pptx

09:45 Enhanced light collection with a wavelength shifter trap

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)

Slides HyperKPhotoDetJune2013.pdf

10:05 R&D of light collection system using acrylic lens

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)

Slides 20130620_hk2.pdf

10:20 → 10:45 Break

10:45 → 11:05 Photo-detectors

10:45 Using Fast Photosensors in the Next Generation Water Cherenkov Neutrino Detectors

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)

Slides msanchez-hyperk-2013-v1.pdf

11:05 → 11:25 DAQ and Electronics System

11:05 R&D items of the DAQ system in HK

Show the necessary R&D items and status of the discussions ( could be short )

Speaker: Dr Yoshinari Hayato (Kamioka obs., ICRR, Univ. of Tokyo)

Slides 130622_HKDAQ.pdf

11:25 → 11:45 Physics Potential

11:25 theta_23 and delta can be measured accurately at the same time

Speaker: Prof. Hisakazu Minakata

Slides HK-meeting-mina.pdf

11:45 → 13:25 Lunch

13:25 → 14:35 Softwares

13:25 Overview and WCsim with the real HK geometry

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)

Slides WCSim-Status.pdf

13:45 Development of WCsim and optimization detecor parameters

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)

Slides HK_open_meeting_slide.pdf

14:05 fiTQun and interface for WCsim

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)

Slides 130622_deperio_fitqun_reconstruction.pdf

14:25 Prospects and plans for software

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)

Slides prospects-20130622.pdf

14:35 → 15:00 Break

15:00 → 16:15 Detector Calibrations

15:00 Overview and plan for Hyper-K calibration

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)

Slides tanaka_20130622_calib.pdf

15:15 OD calibration

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)

Slides HK_ODcal_v1.pdf

15:30 Facility to measure PMT properties

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)

Slides ptf.key ptf.pdf

15:45 Calibration-source positioning system

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)

Slides SzM_HK_CollMeeting_21.VI.2013.pdf

16:00 new calibration source R&D

The status of the development of new calibration source R&D for Hyper-K.

Speaker: Dr Yusuke Koshio (Okayama university)

Slides koshio.pdf

16:15 → 16:40 Break

16:40 → 17:00 Summary of Near Detector discussion

16:40 Summary of near detector discussion

Summary of near detector discussion

Speaker: Dr Mark Hartz (Kavli IPMU)

Slides t2hk_near_detector_discussion.pdf

17:00 → 18:00 Discussions

17:00 Discussions

Slides 130621-Shiozawa-Discussions-v1.0.pdf hklowe-20130622.pdf

17:50 Meeting photo

Photo IMG_6006.JPG

17:55 NNN13

Slides NNN13-ad.pdf