Conceptual design of a collimator for the neutron emission profile monitor in JT-60SA using Monte Carlo simulations

Materials and structures of a collimator for a new neutron emission profile monitor in JT-60SA are examined through Monte Carlo simulations using the Monte Carlo N-Particle transport code. First, the shielding properties of various material combinations are compared in order to determine a combinati...

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Bibliographic Details
Published in:Review of scientific instruments 2020-11, Vol.91 (11), p.113504-113504
Main Authors: Sumida, S., Shinohara, K., Nishitani, T., Ogawa, K., Bando, T., M. Sukegawa, A., Ishikawa, M., Takada, E., Bierwage, A., Oyama, N.
Format: Article
Language:English
Subjects:
Collimation
Conceptual design
Gamma rays
Neutron emission
Neutrons
Polyethylenes
Scientific apparatus & instruments
Shielding
Spatial resolution
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Summary:Materials and structures of a collimator for a new neutron emission profile monitor in JT-60SA are examined through Monte Carlo simulations using the Monte Carlo N-Particle transport code. First, the shielding properties of various material combinations are compared in order to determine a combination with high shielding performances against both neutrons and gamma-rays. It is found that a collimator consisting of borated polyethylene and lead has a high shielding performance against neutrons. Moreover, a high shielding performance against gamma-rays is obtained when a lead pipe with a radial thickness of 0.01 m is inserted into a collimation tube. Second, we demonstrate that it is possible to improve the spatial resolution to a desired level by installing a thin tubular extension structure that fits into the limited space available between the main collimator block and the tokamak device. Finally, the collimator structures that meet both the targeted spatial resolutions (
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0025902