scholarly journals Development of SuperHRPD, a TOF neutron powder diffractomter at J-PARC

2014 ◽  
Vol 70 (a1) ◽  
pp. C140-C140
Author(s):  
Takashi Kamiyama ◽  
Torii Shuki ◽  
Sanghyun Lee ◽  
Ping Miao ◽  
Masao Yonemura ◽  
...  
Keyword(s):  
High Resolution ◽  
Structural Changes ◽  
Life Science ◽  
Solid Angle ◽  
Current Status ◽  
Proton Accelerator ◽  
Neutron Pulse ◽  
Experimental Facility ◽  
Radiation Accident ◽  
Scattering Chamber

SuperHRPD is one of six time-of-flight neutron powder diffractometers in the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). SuperHRPD is looking at a newly developed high resolution moderator which gives narrow & symmetrical neutron pulse with less tails. With using this moderator and lower repetition rate of 25Hz as well as the flight path shorter than 100 m, a high resolution and wide dynamical range is attainable with limited loss of neutrons. The designed highest resolution of SuperHRPD is as high as Δd/d = 0.035 % in the backward bank. Although unplanned shutdown for two years due to the earthquake and the Hadron radiation accident, SuperHRPD has been upgraded repeatedly by the scattering chamber replacement, the increase of detector solid angle, and the improvement of the detector systems, and improvement of resolution. Sample environments cover 4 K – 1000 K, 10GPa and 14 T with up to d = 40 Å. It is emphasized the magnet was designed to detect tiny structural changes precisely as well as magnetic reflections up to 14 T. After three years of operation, we confirmed higher resolution can reduce systematic errors in structural analyses. The current status of SuperHRPD will be reported.

scholarly journals Development of a new special environment powder neutron diffractomter, SPICA

2014 ◽  
Vol 70 (a1) ◽  
pp. C1185-C1185
Author(s):  
Masao Yonemura ◽  
Kazuhiro Mori ◽  
Takashi Kamiyama ◽  
Toshiharu Fukunaga ◽  
Yoshihisa Ishikawa ◽  
...  
Keyword(s):  
High Speed ◽  
Structural Changes ◽  
Rietveld Method ◽  
In Situ Measurements ◽  
Current Status ◽  
Proton Accelerator ◽  
Lithium Content ◽  
Special Environment ◽  
Charge Discharge

SPICA, a new special environment powder neutron diffractometer was built at BL09 in the Material and Life science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). This is the first instrument dedicated solely to the study of next-generation batteries in J-PARC and is optimized for in situ measurements to clarify the structural changes of battery materials at the atomic level. Our approach with this diffractometer is to reveal the reactions in batteries and to determine factors of safety and degradation over long periods in practical battery systems. To make in situ measurements of real batteries more fruitful, we need high Δd/d resolution with wider d ranges to detect many phases during chemical reaction, high neutron intensity to know the specific reaction process in high speed charge/discharge, low background and large sample area to install big sample environment and a dedicated chemistry area to carry out long-term scheduled experiments with many sets of on-beam measurements and off-beam charge-discharge measurements. The in situ measurements can be performed in realistic environment with external variables such as temperature, electric field (current density, pulsed current, and etc.), and high pressure in time-resolved conditions by the 2 m sample space. The reliability of the diffraction data has achieved a sufficiently high level for the structural analysis of materials using the Rietveld method. In the beginning stage of the commissioning, the structural changes of the materials, which are dependent on the lithium content in a commercialized Li-ion battery, were clearly observed. The lattice parameters for the anode and cathode materials as a function of the lithium content were extracted from the diffraction patterns. The current status of SPICA will be reported. ACKNOWLEDGEMENT: This work was predominantly supported by the RISING project of NEDO.

scholarly journals Neutron capture and total cross-section measurements of 155Gd and 157Gd at ANNRI in J-PARC

2020 ◽  
Vol 239 ◽  
pp. 01012
Author(s):  
Atsushi Kimura ◽  
Shoji Nakamura ◽  
Osamu Iwamoto ◽  
Nobuyuki Iwamoto ◽  
Hideo Harada ◽  
...  
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Life Science ◽  
Measurement Instrument ◽  
Proton Accelerator ◽  
Experimental Facility ◽  
Total Cross Sections ◽  
Neutron Time ◽  
Time Of Flight Method ◽  
Glass Detectors

Neutron capture and total cross sections of 155Gd and 157Gd were measured with the neutron time-of-flight method in Accurate Neutron-Nucleus Reaction measurement Instrument at Material and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex using the NaI (Tl) spectrometer and Li-glass detectors. Preliminary cross sections were obtained in the neutron energy region from 4 meV to 100 meV. The derived cross sections agree with evaluated values in JENDL 4.0 and the experimental results by Mastromarco but were not consistent with those by Leinweber.

Conceptual design of an abnormality sign determination system for the general control system of the Materials and Life Science Experimental Facility at J-PARC

2020 ◽  
Vol 22 (2-3) ◽  
pp. 337-343
Author(s):  
K. Sakai ◽  
M. Ooi ◽  
M. Teshigawara ◽  
T. Naoe ◽  
K. Haga ◽  
...  
Keyword(s):  
Control System ◽  
Conceptual Design ◽  
Data Storage ◽  
Life Science ◽  
Proton Accelerator ◽  
Experimental Facility ◽  
General Control ◽  
Determination System ◽  
Operational Data ◽  
Sign Determination

The general control system (GCS) in the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC) has a data storage (DS) server that stores operational data on the status of neutron and muon targets in the MLF. It has worked well to detect unusual situations around these target stations and to investigate the causes of accidents by checking data in the DS server for short-term operations. To pick up potential abnormalities in the slight state transitions from the target stations, however, it is necessary to introduce an abnormality sign determination system (ASDS). This ASDS requires an integral data storage (IDS) server that stores various operational data throughout the proton beams, target stations, and secondary beams for long-term operations because it judges potential abnormalities by using algorithms based on analysis of these data. This report describes a present status of the GCS, a conceptual design for the ASDS, and the installation of the IDS server.

scholarly journals Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex IV: The Muon Facility

2017 ◽  
Vol 1 (1) ◽  
pp. 11 ◽  
Author(s):  
Wataru Higemoto ◽  
Ryosuke Kadono ◽  
Naritoshi Kawamura ◽  
Akihiro Koda ◽  
Kenji Kojima ◽  
...  
Keyword(s):  
Life Science ◽  
Proton Accelerator ◽  
Experimental Facility ◽  
Complex Iv ◽  
Muon Facility ◽  
Research Complex

scholarly journals Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex II: Neutron Scattering Instruments

2017 ◽  
Vol 1 (3) ◽  
pp. 9 ◽  
Author(s):  
Kenji Nakajima ◽  
Yukinobu Kawakita ◽  
Shinichi Itoh ◽  
Jun Abe ◽  
Kazuya Aizawa ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Life Science ◽  
Proton Accelerator ◽  
Experimental Facility ◽  
Complex Ii ◽  
Research Complex

scholarly journals Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex III: Neutron Devices and Computational and Sample Environments

2017 ◽  
Vol 1 (2) ◽  
pp. 10 ◽  
Author(s):  
Kaoru Sakasai ◽  
Setsuo Satoh ◽  
Tomohiro Seya ◽  
Tatsuya Nakamura ◽  
Kentaro Toh ◽  
...  
Keyword(s):  
Life Science ◽  
Complex Iii ◽  
Proton Accelerator ◽  
Experimental Facility ◽  
Research Complex

Vulnerability and Importance of Arctic Wetlands as large-scale nature-based solutions for Sustainability in a Changing Climate

2021 ◽  
Author(s):  
Elisie Kåresdotter ◽  
Zahra Kalantari
Keyword(s):  
Ecosystem Services ◽  
High Resolution ◽  
Large Scale ◽  
Natural Capital ◽  
Environmental Benefits ◽  
Indigenous Populations ◽  
The Arctic ◽  
Current Status ◽  
Human Beings ◽  
Arctic Wetlands

<p>Wetlands as large-scale nature-based solutions (NBS) provide multiple ecosystem services of local, regional, and global importance. Knowledge concerning location and vulnerability of wetlands, specifically in the Arctic, is vital to understand and assess the current status and future potential changes in the Arctic. Using available high-resolution wetland databases together with datasets on soil wetness and soil types, we created the first high-resolution map with full coverage of Arctic wetlands. Arctic wetlands' vulnerability is assessed for the years 2050, 2075, and 2100 by utilizing datasets of permafrost extent and projected mean annual average temperature from HadGEM2-ES climate model outputs for three change scenarios (RCP2.6, 4.5, and 8.5). With approximately 25% of Arctic landmass covered with wetlands and 99% being in permafrost areas, Arctic wetlands are highly vulnerable to changes in all scenarios, apart from RCP2.6 where wetlands remain largely stable. Climate change threatens Arctic wetlands and can impact wetland functions and services. These changes can adversely affect the multiple services this sort of NBS can provide in terms of great social, economic, and environmental benefits to human beings. Consequently, negative changes in Arctic wetland ecosystems can escalate land-use conflicts resulting from natural capital exploitation when new areas become more accessible for use. Limiting changes to Arctic wetlands can help maintain their ecosystem services and limit societal challenges arising from thawing permafrost wetlands, especially for indigenous populations dependent on their ecosystem services. This study highlights areas subject to changes and provides useful information to better plan for a sustainable and social-ecological resilient Arctic.</p><p>Keywords: Arctic wetlands, permafrost thaw, regime shift vulnerability, climate projection</p>

Sign in / Sign up

Export Citation Format

Share Document