Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex I: Pulsed Spallation Neutron Source

The Japan Atomic Energy Research Institute (JAERI) and the High Energy Accelerator Research Organization (KEK) are promoting a plan to construct a 1MW neutron source facility at the Tokai Research Establishment, JAERI, under the Japan Proton Accelerator Research Complex (J-PARC) Project. In the facility, 1 MW pulsed proton beam from a high-intensity proton accelerator will be injected into a mercury target in order to produce high-intensity pulse neutrons for use in the fields of life and material sciences. In order to realize such a high-power neutron source, the design activity of a cross flow type (CFT) mercury target and its peripheral devices has continued and the results is reflected in the ordering specifications of the facility construction. The arrangement of each component and their structure was optimized through experimental and analytical studies. In this paper, the present design of the mercury target components for 1MW spallation neutron source including the target vessel, a mercury circulation system, and a target trolley will be reported.

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Excess RF power required for RF control of the Spallation Neutron Source (SNS) linac, a pulsed high-intensity superconducting proton accelerator

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) ◽

10.1109/pac.2001.987553 ◽

2002 ◽

Cited By ~ 2

Author(s):

M. Lynch ◽

Sung-Il Kwon ◽

A. Regan ◽

Yi-Ming Wang

Keyword(s):

Neutron Source ◽

High Intensity ◽

Proton Accelerator ◽

Spallation Neutron Source ◽

Rf Power

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

EPJ Web of Conferences ◽

10.1051/epjconf/202023901012 ◽

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.

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Neutron lifetime measurement with pulsed cold neutrons

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptaa169 ◽

2020 ◽

Author(s):

K Hirota ◽

G Ichikawa ◽

S Ieki ◽

T Ino ◽

Y Iwashita ◽

...

Keyword(s):

Decay Rate ◽

Reaction Rate ◽

Proton Accelerator ◽

Neutron Decay ◽

Spallation Neutron Source ◽

Neutron Lifetime ◽

Cold Neutrons ◽

Research Complex ◽

Gas Chamber ◽

Pulsed Neutron

Abstract The neutron lifetime has been measured by comparing the decay rate with the reaction rate of 3He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the 3He(n, p) 3H reaction using a gas chamber of which working gas contains diluted 3He. The measured neutron lifetime was 898 ± 10stat+15−18sys s.

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

Journal of Neutron Research ◽

10.3233/jnr-190133 ◽

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.

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