Study of converging neutron guides for the cold neutron double-chopper spectrometer at J-PARC

Ryoichi Kajimoto; Mitsutaka Nakamura; Toyotaka Osakabe; Taku J. Sato; Kenji Nakajima; Masatoshi Arai

doi:10.1016/j.physb.2006.05.419

Study of converging neutron guides for the cold neutron double-chopper spectrometer at J-PARC

Ryoichi Kajimoto, Mitsutaka Nakamura, Toyotaka Osakabe, Taku J. Sato, Kenji Nakajima, Masatoshi Arai

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Performance of converging neutron guides was studied for the cold neutron double-chopper spectrometer proposed for the spallation neutron source at J-PARC. Intensity, spatial distribution, and angular distribution of a neutron beam at a sample are compared for linearly tapered and elliptic geometries by Monte Carlo simulation. For low-energy neutrons, the flux on the sample is much increased by an elliptic geometry whose focal points are on the moderator and on the sample in compensation for the angular resolution. To keep a substantial gain for a wide energy range, an elliptic guide with one of the focal points far behind the moderator is better. It also gives good spatial and angular intensity profiles at the sample.

Original language	English
Pages (from-to)	1236-1239
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	385-386
DOIs	https://doi.org/10.1016/j.physb.2006.05.419
Publication status	Published - 2006 Nov 15
Externally published	Yes

Keywords

J-PARC
Neutron guide
Spallation neutron source

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/j.physb.2006.05.419

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title = "Study of converging neutron guides for the cold neutron double-chopper spectrometer at J-PARC",

abstract = "Performance of converging neutron guides was studied for the cold neutron double-chopper spectrometer proposed for the spallation neutron source at J-PARC. Intensity, spatial distribution, and angular distribution of a neutron beam at a sample are compared for linearly tapered and elliptic geometries by Monte Carlo simulation. For low-energy neutrons, the flux on the sample is much increased by an elliptic geometry whose focal points are on the moderator and on the sample in compensation for the angular resolution. To keep a substantial gain for a wide energy range, an elliptic guide with one of the focal points far behind the moderator is better. It also gives good spatial and angular intensity profiles at the sample.",

keywords = "J-PARC, Neutron guide, Spallation neutron source",

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AU - Kajimoto, Ryoichi

AU - Nakamura, Mitsutaka

AU - Osakabe, Toyotaka

AU - Sato, Taku J.

AU - Nakajima, Kenji

AU - Arai, Masatoshi

PY - 2006/11/15

Y1 - 2006/11/15

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AB - Performance of converging neutron guides was studied for the cold neutron double-chopper spectrometer proposed for the spallation neutron source at J-PARC. Intensity, spatial distribution, and angular distribution of a neutron beam at a sample are compared for linearly tapered and elliptic geometries by Monte Carlo simulation. For low-energy neutrons, the flux on the sample is much increased by an elliptic geometry whose focal points are on the moderator and on the sample in compensation for the angular resolution. To keep a substantial gain for a wide energy range, an elliptic guide with one of the focal points far behind the moderator is better. It also gives good spatial and angular intensity profiles at the sample.

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