A5008732352- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Neutrino Physics Research
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Diamond and Carbon-based Materials Research
- Physics of Superconductivity and Magnetism
- Magnetic confinement fusion research
- Metal and Thin Film Mechanics
- Structural Behavior of Reinforced Concrete
- Inertial Sensor and Navigation
- Atomic and Subatomic Physics Research
- Conducting polymers and applications
- X-ray Diffraction in Crystallography
- Chemical Synthesis and Characterization
- Superconductivity in MgB2 and Alloys
- Organic Electronics and Photovoltaics
- Advanced NMR Techniques and Applications
- Ammonia Synthesis and Nitrogen Reduction
High Energy Accelerator Research Organization
2015-2024
Japan Proton Accelerator Research Complex
2010-2023
The Graduate University for Advanced Studies, SOKENDAI
2021
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2017
NTT Basic Research Laboratories
2013-2014
Nissan (United States)
2014
Nagoya University
1977-2013
Kobe University
2012-2013
National Institute of Advanced Industrial Science and Technology
2012-2013
Tohoku University
2003-2013
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
This letter describes the first successful attempt at synthesizing diamond by chemical vapor deposition with use of a dc plasma jet. A jet, formed arc discharge CH4 diluted H2, was sprayed onto water-cooled substrate. The growth rate film 80 μm/h. crystallinity measures well in terms x-ray diffraction and Raman spectroscopy. quenching effect thermal is discussed relation to high obtained.
Various superconducting detector solenoids for particle physics have been developed in the world. The key technology is aluminum-stabilized conductor almost all magnets experiments. With progress of conductor, coil fabrication has progressed as well, such inner winding technique, indirect cooling, transparent vacuum vessel, quench protection scheme using pure aluminum strips and so on. design study future big projects Japan Europe, that is, ILC, FCC CLIC, based on technologies established...
At the J-PARC Muon Science Facility (MUSE), MuSEUM collaboration is now performing new precision measurements of ground state hyperfine structure (HFS) both muonium and muonic helium atoms. High-precision ground-state HFS are recognized as one most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe standard model determine fundamental constants positive muon magnetic moment mass. The same technique can also be employed measure HFS, obtain negative mass,...
As a new method to determine the resonance frequency, Rabi-oscillation spectroscopy has been developed. In contrast conventional which draws curve, fits time evolution of Rabi oscillation. By selecting optimized it is shown that precision twice as good with frequency sweep. Furthermore, data under different conditions can be treated in unified manner, allowing more efficient measurements for systems consisting limited number short-lived particles produced by accelerators such muons. We have...
KEK has been conducting the design study of beam separation dipole magnet, D1, for High Luminosity LHC (HL-LHC) upgrade within a framework CERN-KEK collaboration. The D1 magnet coil aperture 150 mm using Nb-Ti superconducting cable and nominal field 5.6 T can be generated at 12 kA 1.9 K. A integral 35 T·m is required. development 2-m-long model started since May 2013. This paper describes status short as well advancement fundamental studies.
The High-Luminosity Large Hadron Collider upgrade (LHC) project aims to increase the peak luminosity of LHC 5 ×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">34</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">- 2</sup> s 1</sup> , and a total integrated 3000 fb from 2020 2030 by upgrading low-beta insertion system for ATLAS CMS experiments. aperture magnets including focusing/defocusing quadrupoles separation dipoles will be doubled...
A superconducting magnet system for the COMET experiment is now under construction in Japan Proton Accelerator Research Complex to achieve most intense negatively charged muon beam world. The main part of system, Pion Capture Solenoid, will be exposed severe irradiation from production target inside magnets; consequently, coils heated by interactions with secondary particle. degradation on thermal conductivity also expected these conduction-cooled as radiation damage can accumulated a...
An upgrade of the low-beta insertion system for ATLAS and Compact Muon Solenoid experiments is proposed in high luminosity Large Hadron Collider project. It includes final beam focusing quadrupoles, separation recombination dipoles, larger aperture matching section quadrupoles. KEK charge conceptual design large dipole D1. The latest parameters are a main field ~ 5 T at 1.9 K with Nb-Ti superconducting technology, coil 160 mm, cos-theta one-layer cable. Because new D1 expected to be operated...
The COMET Phase-I experiment now under construction at the Hadron Hall of J-PARC aims to search for coherent neutrinoless conversion a muon an electron. requires large superconducting solenoid system that consists 5-T pion capture and 5~3 T matching 3-T 90° decay/muon transport curved solenoid. encloses target generate pions. neutron irradiation generated by causes various influences One major issues is cooling coil can be degraded due irradiation. analyses design accommodate were performed....
Superconducting combined function magnets will be utilized for the 50 GeV, 750 kW proton beam line J-PARC neutrino experiment. The magnet is designed to provide a dipole field of 2.6 T with quadrupole 19 T/m in coil aperture 173.4 mm at nominal current 7345 A. Two full-scale prototype verify performance were successfully developed. first experienced no training quench during excitation test and good quality was confirmed.
The development of a large-aperture (120–180 mm) dipole magnet is proposed in the framework CERN-KEK cooperation program. application target D1 (separation dipoles) replacement for HL-LHC (High Luminosity—Large Hadron Collider) upgrade. Cos-theta type coil cross section and shell-based structure are adopted conceptual design this magnet. nominal field estimated to be 6–10 T at 1.9 K with 30-mm-width arranged two layers. candidates superconductor <formula formulatype="inline"...
High precision measurements of the ground state hyperfine structure (HFS) muonium is a stringent tool for testing bound-state quantum electrodynamics (QED) theory, determining fundamental constants muon magnetic moment and mass, searches new physics. Muonium most suitable system to test QED because both theoretical experimental values can be precisely determined. Previous were performed decades ago at LAMPF with uncertainties mostly dominated by statistical errors. At J-PARC Muon Science...
A superconducting magnet for a Fixed Field Alternating Gradient (FFAG) accelerator is proposed. The static magnetic field required to be proportional the k-th power of orbit radius where k geometrical index accelerator. left/right asymmetric coil with elliptical aperture introduced maximize horizontal compact design. 3D configuration designed meet requirement in terms integral field. evaluated and along beam trajectory satisfies optics FFAG
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Following success of a prototype R&D, construction superconducting magnet system for J-PARC neutrino beam line has been carried out since 2005. A new conceptual with the combined function magnets demonstrated successful transport to production target. </para>
To improve the power conversion efficiency (PCE) of polymer solar devices, we introduced a highly crystalline nanocrystal titanium oxide layer (nc-TiO2 layer) that was formed by spin-coating dispersed liquid precrystallized nanoparticles. The nc-TiO2 can be more easily and with higher reproducibility than TiOx conventional low-temperature sol–gel method. By inserting layer, PCE significantly improved from 2.70 to 3.91%. enabled larger decrease in internal resistance layer; thus, acts as an...
At the J-PARC muon facility (MUSE), new beamlines started operation recently. H-line is a high-intensity pulsed beamline for fundamental physics experiments. The first beam of was delivered to its branch (H1 area) in January 2022, where precise measurement muonium hyperfine structure and search μ-e conversion will be conducted. Further extension second g-2/EDM experiment transmission microscope project also ongoing. In addition, surface (S2 area S-line) opened 1S-2S spectroscopy FY2021. this...
The J-PARC Neutrino Experiment, the construction of which starts in JFY 2004, will use a superconducting magnet system for its primary proton beam line. system, bends 50 GeV 0.75 MW by about 80 degrees, consists 28 combined function magnets. magnets utilize single layer left/right asymmetric coils that generate dipole field 2.6 T and quadrupole 18.6 T/m with operation current 7.35 kA. also contains few conduction cooled corrector serve as vertical horizontal steering All are designed to...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Superconducting combined function magnets for the J-PARC (Japan Proton Accelerator Research Complex) neutrino experiment have been successfully developed at High Energy Organization, KEK. The first prototype magnet reassembled quench protection studies, and cold test result indicated that eight heaters are effective safe of magnet. Three production fabricated tested 4.5 K, 1 atm, in a vertical...