article Open AccessTop 10% cited

Development of a Wide Dynamic Range Neutron Flux Measurement Instrument Having Fast Time Response for Fusion Experiments

Plasma and Fusion Research · 2021 · Vol. 16(0) · pp. 1405018–1405018

Daijiro ITO✉(Toshiba (Japan))Hiroyuki Yazawa(Toshiba (Japan))Makoto Tomitaka(Toshiba (Japan))T. Kumagai(Toshiba (Japan))Shigehiro Kono(Toshiba (Japan))M. Yamauchi(Toshiba (Japan))Tsuyoshi Misawa(Kyoto University)T. Kobuchi(National Institute for Fusion Science)Hiroshi Hayashi(National Institutes of Natural Sciences)Hitoshi MIYAKE(National Institute for Fusion Science)K. Ogawa(National Institutes of Natural Sciences)T. Nishitani(National Institute for Fusion Science)M. Isobe(National Institute for Fusion Science)

View via DOI Full-text PDF

Abstract

A wide-range neutron flux measurement instrument is developed herein for monitoring the total neutron emission rate and yield of the Large Helical Device (LHD) during deuterium experiments implemented from March 2017 in the National Institute for Fusion Science (NIFS), Japan. The instrument is designed for and installed on the Neutron Flux Monitoring (NFM) system, which measures the counting rate using a 235U Fission Chamber. By combining the pulse counting and Campbell methods, the Digital Signal Processing Unit (DSPU) realized a wide dynamic range of over six orders of magnitude from 1 × 103 counts/s (cps) to 5 × 109 cps. This study explains and discusses how the instrument is developed, including topics from the predevelopment activities to the verification test at the Kyoto University Critical Assembly (KUCA). Experimental results in the LHD using the finished products suggest that the NFM system works well during deuterium experiments.

Nuclear Physics and Applications Magnetic confinement fusion research Nuclear reactor physics and engineeringNeutron fluxNeutronNuclear engineeringLarge Helical DeviceNuclear physicsDeuteriumFissionRange (aeronautics)Dynamic rangePhysics

Funding

National Institute for Fusion Science

Citations

FWCI

4.93

field-weighted impact

References

Percentile

96%

vs. same field & year

Citations per year

Cited by

Progress on Integrated Neutron Diagnostics for Deuterium Plasma Experiments and Energetic Particle Confinement Studies in the Large Helical Device During the Campaigns from FY2017 to FY2019

Plasma and Fusion Research · 2021 · 23 citations

Citation Network

How this paper connects to the literature. Drag to explore, click any node to open that paper.