# Open Meeting for the Hyper-Kamiokande Project

21-23 August 2012
Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo
Asia/Tokyo timezone
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## Contribution List

Displaying 53 contributions out of 53
In the Hyper-K detector, all information about a given set of final state particles is encoded in a charge and a time for each photomultiplier tube. This new reconstruction algorithm, based on the method used by MiniBooNE (NIM A608, 206 (2009)), calculates time and charge probability distribution functions for every tube at each stage of a likelihood fit minimization. The particle light emission p ... More
Presented by Dr. Michael WILKING on 23 Aug 2012 at 2:05 PM
Recently experimental measurements of reactor, atmospheric, and solar neutrinos have provided an increasingly clear picture of neutrino oscillations. However, several open issues including the nature of the neutrino mass hierarchy, the octant of $\theta_{23}$, and whether or not neutrinos are CP-violating, remain. Atmospheric neutrinos are capable of addressing these questions due to the sizeable ... More
Presented by Dr. Roger WENDELL on 22 Aug 2012 at 3:20 PM
The Daya Bay reactor anti-neutrino experiment has made the most precise measurement of the neutrino mixing angle $\theta_{13}$ to date, using six identical gadolinium-loaded liquid scintillator detector modules. A fully automated calibration system was developed to give a comprehensive and robust calibration of detector response with multiple gamma and neutron sources. In this talk, I will des ... More
Presented by Prof. Jianglai LIU on 23 Aug 2012 at 3:55 PM
Session: Water System
The grand design of Hyper-K water and the detail of the pure water system including the flow in the tank will be presented.
Presented by Dr. Hiroyuki SEKIYA on 23 Aug 2012 at 9:00 AM
Session: Water System
Recent research and development towards Water-based Liquid Scintillator (WbLS) appears to suggest that such materials can be made stable and economical in large quantities. This opens the possibility to detect low energy particles below the Cherenkov threshold that are inaccessible to a water Cerenkov detector. It also enhances the scientific agenda of future large water Cherenkov detectors. Preli ... More
Presented by David JAFFE on 23 Aug 2012 at 9:45 AM
The specific egg-shape geometry of Hyper-Kamiokande poses firstly difficulties for the future calibration campaigns performed in the detector. In contrast to Super-K, the vertical walls would be curved which would limit access to certain regions of the active volume causing unnecessary reduction in the number of calibration locations. As a result, there is a strong urge to develop new, 3-dimension ... More
Presented by Dr. Szymon MANECKI on 23 Aug 2012 at 4:10 PM
Presented by Dr. Hide-Kazu TANAKA on 23 Aug 2012 at 4:45 PM
Presented by Prof. Masato SHIOZAWA on 23 Aug 2012 at 4:45 PM
The in situ deployment of radioactive and light sources is among the most important means of calibrating and understanding the response of large water Cherenkov detectors. Such calibration data are the primary means by which the optical properties of the water and the response of the photomultipliers are understood. Given that the Hyper-Kamiokande design calls for ten optically isolated detector v ... More
Presented by Mr. Hirohisa A. TANAKA on 23 Aug 2012 at 3:40 PM
Effect of cosmic background for atm. nu and proton decay will be discussed.
Presented by Prof. Kimihiro OKUMURA on 22 Aug 2012 at 3:45 PM
Session: DAQ System
Report the current idea of the HK DAQ system
Presented by Dr. Yoshinari HAYATO on 23 Aug 2012 at 1:30 PM
Presented by Dr. Yoshinari HAYATO on 23 Aug 2012 at 4:45 PM
Hyper-Kamiokande will have a tremendous potential for the detection of neutrino signals from dark matter annihilations. The talk will give an overview of analysis methods and dark matter detection channels relevant for Hyper-K. The talk will conclude by giving dark matter sensitivities and by pointing out specific instrumental details that will help to optimize the physics potential for Hyper-K.
Presented by Dr. Carsten ROTT on 22 Aug 2012 at 5:15 PM
WCSim is a Geant4 based water Cherenkov detector simulation originally developed to test the physics potential of a 1 kton water detector located 2 km away from the T2K beam target. Recently, its code has been updated to accommodate the needs of the LBNE water Cherenkov detector option by allowing the simulation of large cylindrical tank configurations with an adjustable number of PMTs. Moreover, ... More
Presented by Prof. Chris WALTER on 23 Aug 2012 at 2:25 PM
The next generation neutrino experiments like the Hyper-Kamiokande requires cost-effective ways to instrument large volumes with O(10^(4−5)) pieces of photodetectors. Such photodetectors are required to have good effective quantum efficiency, large active area, high gain to allow use of simple and cheap electronics, and good time resolution to reconstruct the wave front of the Cherenkov cone. ... More
Presented by Prof. Toru IIJIMA on 23 Aug 2012 at 1:15 PM
on 23 Aug 2012 at 5:45 PM
Session: Cavity and Tanks
The baseline design of the HK cavern and construction schedule, ongoing optimization works, remaining issues will be explained in this talk.
Presented by Prof. Masato SHIOZAWA on 22 Aug 2012 at 5:35 PM
on 23 Aug 2012 at 6:45 PM
Session: Water System
A water system design which allows the use of dissolved gadolinium sulfate in Hyper-Kamiokande will be discussed, along with the current status of Super-Kamiokande's gadolinium R&D project.
Presented by Prof. Mark VAGINS on 23 Aug 2012 at 9:25 AM
Session: Opening Session
In the opening session, I'd like to give a kind of guideline of discussions in the meeting. First goal is to form active working groups for each development works including physics potential studies. Proposal for the organization structure and timeline will be given. I'd like to also present future prospect of the project in terms of forming international collaboration, budget request, etc.
Presented by Prof. Masato SHIOZAWA on 22 Aug 2012 at 11:20 AM
Session: Opening Session
Status of HEP and Neutrino Project in Japan and Asia. The KEK status is also reported.
Presented by Prof. Yasuhiro OKADA on 22 Aug 2012 at 9:00 AM
Hybrid Photo-Detector (HPD) with an avalanche diode is one of the photo-sensor candidates for Hyper-K. It is considered to have a better performance in lower price than PMT in Super-K. We started a study of an 8-inch HPD developed by Hamamatsu Photonics and that of a 20-inch diameter will be provided within a few years. In Kamioka mine we have a plan to test the HPD in a 200-ton water Cherenkov de ... More
Presented by Dr. Yasuhiro NISHIMURA on 23 Aug 2012 at 10:05 AM
Session: Cavity and Tanks
The design of liner and related studies will be presented in the meeting. In the baseline design of the PMT support, SUS support like the Super-K is presented in the Letter of Intent. We are investigating a possibility of cost reduction by hanging PMTs by wires.
Presented by Prof. Masato SHIOZAWA on 22 Aug 2012 at 6:10 PM
The usual strategy for controlling systematic uncertainties due to neutrino interactions in oscillation experiments is to use the same beam, or data from other experiments, to constrain those uncertainties. In this brief discussion, I point out a few limitations in this technique that may be problematic for oscillation physics in the high precision era, and I will suggest some possible remedies.
Presented by Kevin MCFARLAND on 22 Aug 2012 at 3:00 PM
Session: J-PARC Session
J-PARC Status
Presented by Prof. Yujiro IKEDA on 22 Aug 2012 at 1:00 PM
Session: J-PARC Session
Presented by Prof. Tadashi KOSEKI on 22 Aug 2012 at 1:25 PM
Session: Opening Session
Japan CRC (Cosmic-Ray-Committee) future project subcommittee report
Presented by Prof. Nobuyuki KANDA on 22 Aug 2012 at 11:00 AM
Session: Opening Session
Japan HEP future project subcommittee report
Presented by Prof. Toshinori MORI on 22 Aug 2012 at 10:40 AM
[SINNIS, Gus (Los Alamos National Laboratory)] The Long Baseline Neutrino Experiment in the US was developing two far detector concepts in parallel. While a liquid Argon time projection chamber was ultimately selected as the far detector technology, we have performed a conceptual design of the calibration requirements and systems needed for a large (200 kTon) water Cherenkov detector. In this t ... More
Presented by Thomas KUTTER, Dr. Gus SINNIS on 23 Aug 2012 at 4:25 PM
LBNE photosensor R&D including light collection options
Presented by Robert SVOBODA on 23 Aug 2012 at 10:55 AM
I will review the physics potential of a long baseline experiment using J-PARC neutrino beam and Hyper-K, and proton decay search in Hyper-K.
Presented by Prof. Masashi YOKOYAMA on 22 Aug 2012 at 1:55 PM
Large, deep, well shielded liquid detectors have become an important technology for the detection of neutrinos over a wide dynamic range of a few MeV to TeV. The critical component of this technology is the large format semi-hemispherical photo-multiplier tube with diameters in the range of 25 to 50cm. The survival of an assembled array of these photo-multiplier tubes under high hydrostatic pressu ... More
Presented by Dr. Jiajie LING on 23 Aug 2012 at 11:10 AM
Session: Opening Session
European Neutrino project status
Presented by Prof. Andre RUBBIA on 22 Aug 2012 at 9:50 AM
Session: Opening Session
US neutrino project status
Presented by Robert SVOBODA on 22 Aug 2012 at 9:25 AM
In this talk, a prospect for software development will be discussed.
Presented by Dr. Makoto MIURA on 23 Aug 2012 at 1:55 PM
Session: Social Event
on 22 Aug 2012 at 7:10 PM
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, i ... More
Presented by Dr. Fabrice RETIERE on 23 Aug 2012 at 1:00 PM
Presented by Dr. Shoei NAKAYAMA, Dr. Yasuhiro NISHIMURA on 23 Aug 2012 at 4:45 PM
We have undertaken a detailed investigation of photomultiplier tube (PMT) glass fracture at Alfred University, in support of Brookhaven National Laboratory’s Long Baseline Neutrino Experiment (LBNE). The strength and lifetime prediction of the PMT glass are crucial to the success of the neutrino detection. Glass fracture is statistical in nature. Glasses are generally under constant state of s ... More
Presented by Prof. S. K. SUNDARAM on 23 Aug 2012 at 11:25 AM
Session: Social Event
on 21 Aug 2012 at 5:00 PM
Session: Registration
on 21 Aug 2012 at 5:00 PM
Session: Registration
on 21 Aug 2012 at 8:00 AM
Super-Kamiokande (SK) is a 50kton water Cherenkov detector. Since starting the experiment, many kinds of calibration has been doing. In this presentation, the calibration in SK will be summarized, and discuss about what is a critical point for water Cherenkov detector calibration. From that point of view, a requirement for HK will also be discussed.
Presented by Dr. Yusuke KOSHIO on 23 Aug 2012 at 3:15 PM
Presented by Dr. Makoto MIURA on 23 Aug 2012 at 4:45 PM
n this presentation, the sensitivity of solar neutrinos is discussed. In the case of shallow place, the most serious background will be spallation products induced from cosmic ray muons. How much reduce background by improving an analysis method will be estimated. Using this result, the requirement for the solar neutrino physics, such as the constraint to delta-m-square_21, is discussed. The expec ... More
Presented by Dr. Yusuke KOSHIO on 22 Aug 2012 at 4:25 PM
Session: Cavity and Tanks
A prototype veto system was designed and built for LBNE that used a veto system only 85 cm thick with minimal PMT coverage. The design and efficiency measurements are presented.
Presented by Robert SVOBODA on 22 Aug 2012 at 6:50 PM
The diffuse supernova neutrino background (DSNB) is the faint glow of MeV neutrinos from distant core-collapse supernovae. It has not been detected yet, but the Super-K upper limit on the flux of electron antineutrino is very close to modern predictions. Hyper-K is expected to detect dozens of DSNB neutrinos yearly. In addition, Hyper-K will open a new window of neutrinos from core collapses occur ... More
Presented by Dr. Shunsaku HORIUCHI on 22 Aug 2012 at 4:50 PM
Discuss about important systematic errors for the CPV measurement
Presented by Dr. Shoei NAKAYAMA on 22 Aug 2012 at 2:25 PM
Session: Cavity and Tanks
A very detailed feasibility study for the "Canfranc Underground Laboratory" (LSC) to host a Next-Generation Mega-ton type Neutrino and Nucleon Decay Experiment was carried out within the EU funded LAGUNA program (E.U. Grant Agreement No. 212343 FP7-INFRA-2007-1). All fundamental aspects were covered: geological, geotechnic, environmental, socio-economical etc. A pre-design of the the main caverns, ... More
Presented by Prof. Luis LABARGA on 22 Aug 2012 at 5:55 PM
The Hyper-K letter of intent discusses the physics potential to measure delta_cp by a J-PARC to Hyper-K long baseline experiment assuming systematic errors for the signal and background that are controlled at the 5% level. Reducing uncertainties in neutrino flux and interaction modeling will be crucial to achieve 5% uncertainties. The T2K experiment, which uses the J-PARC neutrino beam, an off-a ... More
Presented by Dr. Mark HARTZ on 22 Aug 2012 at 2:40 PM
Presented by Dr. Hiroyuki SEKIYA, Prof. Mark VAGINS on 23 Aug 2012 at 4:45 PM
Session: Cavity and Tanks
The design considerations for the water containment system and the PMT deployment systems for the LBNE water Cherenkov detector will be presented. Several design alternatives for the membrane liner for the water Cherenkov detector were investigated and a summary of these investigations will be presented. Several alternate designs for the PMT mounting scheme were also investigated as part of the de ... More
Presented by Jim STEWART on 22 Aug 2012 at 6:30 PM