The Implementation of the dynamics analysis spectrometer DNA; The Pedigree of the backscattering neutron spectrometer

Shibata, Kaoru

Hamon, 28(1), p.26 - 28, 2018/02

https://doi.org/10.5611/hamon.28.1_26

We briefly introduce the pedigree of the backscattering neutron spectrometer and the specification of DNA; a time-of-flight (TOF) type near-backscattering spectrometer (n-BSS), with Si crystal analyzers which was constructed at the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC).

Design of a single moderator-type neutron spectrometer with enhanced energy resolution in energy range from a few to 100 keV

Tanimura, Yoshihiko; Saegusa, Jun; Yoshizawa, Michio; Yoshida, Makoto

Nuclear Instruments and Methods in Physics Research A, 547(2-3), p.592 - 600, 2005/08

https://doi.org/10.1016/j.nima.2005.03.162

The moderator structure of a neutron spectrometer was optimized with a Monte Carlo code of MCNP-4B. The spectrometer consists of a cylindrical moderator and a position-sensitive thermal neutron detector. It can obtain an energy spectrum from thermal neutron distribution along the cylindrical axis of the moderator. The structure of the moderator was improved by putting a low hydrogen density material in the front of a high hydrogen density one and inserting a neutron absorber which eliminated thermal neutrons diffusing in the moderator. These improvements make energy resolution of the spectrometer better especially for the low energy neutrons from a few tens to 100 keV. The designed spectrometer can be applied to the measurement of energy spectrum over a neutron energy range from a few keV to 20 MeV.

Creation of new McStas components of moderators of JSNS for developing new pulse spectrometer

Tamura, Itaru; Aizawa, Kazuya; Harada, Masahide; Shibata, Kaoru; Maekawa, Fujio; Soyama, Kazuhiko; Arai, Masatoshi

Proceedings of ICANS-XVI, Volume 1, p.529 - 539, 2003/07

Moderator components of the McStas code have been created for the design of the spectrometers of JSNS. Three cryogenic moderators are adopted in JSNS, One is a coupled H moderator for high intensity experiments and other two are decoupled H with poisoned or unpoisoned for high resolution moderators. Monte Carlo simulations have turned out to be useful for design of neutron scattering instruments with high complexity. The software package McStas is selected for its own flexibility. Since the characteristics of neutron beams generated from moderators make influence on the performance of pulse neutron spectrometers, it is important to perform the simulation with neutron source component written precisely. Both Energy dependence of neutron spectrum and time structure of neutrons were calculated using NMTC/JAERI97 and MCNP4a codes.The simulation parameters, which describe the pulse shape as a function of time, are optimized. The creation of neutron source components viewed to coupled H moderator and viewed to decoupled H moderator of JSNS are reported.

Simulation for developing new pulse neutron spectrometers, 1; Creation of new McStas components of moderators of JSNS

Tamura, Itaru; Aizawa, Kazuya; Harada, Masahide; Shibata, Kaoru; Maekawa, Fujio; Soyama, Kazuhiko; Arai, Masatoshi

JAERI-Research 2003-008, 34 Pages, 2003/03

JAERI-Research-2003-008.pdf:1.62MB

Moderators components of the McStas code have been created for the design of JSNS instruments. Three cryogenic moderators are adopted in JSNS, One is coupled H moderators for high intensity experiments and other two are decoupled H with poisoned or unpoisoned for high resolution moderators. Since the characteristics of neutron beams generated from moderators make influence on the performance of pulse neutron spectrometers, it is important to perform the Monte Carlo simulation with neutron source component written recisely. The neutron spectrum and time structure were calculated using NMTC/JAERI97 and MCNP4a codes. The simulation parameters, which describe the pulse shape over entire spectrum as a function of time, are optimized. In this paper, the creation of neutron source components for port No.16 viewed to coupled H moderator and for port No.11 viewed to decoupled H moderator of JSNS are reported.

Neutronics experiments for ITER at JAERI/FNS

Konno, Chikara; Maekawa, Fujio; Kasugai, Yoshimi; Uno, Yoshitomo; Kaneko, Junichi; Nishitani, Takeo; Wada, Masayuki*; Ikeda, Yujiro; Takeuchi, Hiroshi

Nuclear Fusion, 41(3), p.333 - 337, 2001/03

https://doi.org/10.1088/0029-5515/41/3/311

no abstracts in English

Fusion neutronic source deuterium-tritium neutron spectrum measurements using natural diamond detectors

A.V.Krasilnikov*; Kaneko, Junichi; Nishitani, Takeo; Maekawa, Fujio;

Review of Scientific Instruments, 68(4), p.1720 - 1724, 1997/04

https://doi.org/10.1063/1.1148001

no abstracts in English

Whole energy absorption spectrometer for decay heat measurement of fusion reactor materials and application for beta-ray spectrum measurement

Maekawa, Fujio; Ikeda, Yujiro

Proc. of Int. Conf. on Nucl. Data for Science and Technol., 59, p.1201 - 1205, 1997/00

no abstracts in English

Neutron spectrometers for ITER

Nishitani, Takeo; Iguchi, Tetsuo*; ; Kaneko, Junichi; Kasai, Satoshi; Matoba, Toru

Proc., Workshop on Diagnostics for Experimental Thermonuclear Fusion Reactors, 0, p.425 - 434, 1996/00

no abstracts in English

Energy levels of Tc from the Mo(p,n)Tc reaction

;

Journal of the Physical Society of Japan, 48(1), p.4 - 15, 1980/00

https://doi.org/10.1143/JPSJ.48.4

no abstracts in English

Measurements of neutron reaction cross sections using a liquid scintillation spectrometer

Nuclear Instruments and Methods, 109(3), p.493 - 501, 1973/03

no abstracts in English