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 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 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

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 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.

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