Beam commissioning for neutron and muon facility at J-PARC

Meigo, Shin-ichiro; Ohi, Motoki; Kai, Tetsuya; Ono, Taeko; Ikezaki, Kiyomi; Haraguchi, Tetsuya; Fujimori, Hiroshi; Sakamoto, Shinichi

doi:10.1016/j.nima.2008.11.068

Cited by 24 publications

(8 citation statements)

References 5 publications

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“…There are several neutronscience facilities worldwide [7][8][9][10][11][12][13][14][15][16][17][18] . Neutron facilities in China include the Heavy Water Research Reactor (HWRR) and the soon to be completed China Advanced Research Reactor (CARR) [7] in the China Institute of Atomic Energy, Beijing, and the China Spallation Neutron Source (CSNS) [8] under construction in Dongguan, Guangdong province.…”

Section: Neutron Sourcesmentioning

confidence: 99%

“…Neutron facilities in China include the Heavy Water Research Reactor (HWRR) and the soon to be completed China Advanced Research Reactor (CARR) [7] in the China Institute of Atomic Energy, Beijing, and the China Spallation Neutron Source (CSNS) [8] under construction in Dongguan, Guangdong province. User facilities outside China include the Institut Laue-Langevin (ILL) in Grenoble, France [9] , the ORPHEE reactor at the Laboratoire Léon Brillouin (LLB) in Saclay, France [14] , ISIS at the Rutherford Appleton Laboratory in the United Kingdom [9] , the High Flux Isotope Reactor (HFIR) and the new Spallation Neutron Source (SNS) at Oak Ridge National Laboratory in the USA [15,16] , the Japan Spallation Neutron Source (JSNS) at the Japan Proton Accelerator Research Complex (J-PARC) [17] , and the OPAL reactor at the Australian Nuclear Science and Technology Organisation (ANSTO) [18] . ISIS, SNS and JSNS utilize a pulsed spallation source, while HWRR, CARR, ILL, ORPHEE, HFIR, and OPAL operate with a reactor neutron source.…”

Section: Neutron Sourcesmentioning

confidence: 99%

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Polarized neutron diffraction and its application to spin density studies

Dougan

Chen

2009

Sci. China Ser. B-Chem.

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Spin density distributions in molecular compounds containing unpaired electrons have been studied by polarized neutron diffraction (PND). The spin density distributions provide a unique perspective of the magnetic properties of the compounds. The background and fundamentals of polarized neutron diffraction are summarized in this review, followed by examples of applications in inorganic and organic chemistry. Spin densities in several compounds that are obtained by polarized neutron diffraction are highlighted. Spin densities in single molecular magnet [Fe 8 O 2 (OH) 12 ( tacn) 6 ] 8+ and cyano-bridged K 2 [Mn(H 2 O) 2 ] 3 [Mo(CN) 7 ] 2 ·6H 2 O demonstrate how to obtain magnetic interaction in the complexes by PND. PND studies of Ru(acac) 3 , containing one single unpaired electron, show small spin densities in this complex. Finally the use of PND in studying nitronyl nitroxide radicals is given. Our goal in this review is to illustrate how PND functions and how it serves as a sensitive tool in directly probing spin density in molecules.polarized neutron diffraction, spin (unpaired electron) density, paramagnetic, antiferromagnetic, magnetic structure factor 1 Background Unpaired electrons and magnetic properties of molecular compounds have been extensively studied by multiple spectroscopic methods. For instance, electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) have been used to determine electronic g-tensors and magnetic hyperfine interactions in paramagnetic compounds by employing the magnetic nuclei as local probes [1][2][3][4][5][6] . Since unpaired electrons usually reside in valence molecular orbitals, magnetic properties of the compounds that mainly arise from the unpaired electrons are very sensitive to changes in bonding. The spectroscopic properties, especially EPR, are particularly useful, providing information on the electron configuration of transition metals and spin density distributions in the molecules. While these techniques probe the energetic aspects of the wavefunction and bonding, polarized neutron diffraction (PND) examines the spatial aspects of the wavefunction and bonding in the compounds, giving different features of the bonding. PND is a unique technique in that it directly provides spin density in a compound.

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Section: Neutron Sourcesmentioning

confidence: 99%

Section: Neutron Sourcesmentioning

confidence: 99%

Polarized neutron diffraction and its application to spin density studies

Dougan

Chen

2009

Sci. China Ser. B-Chem.

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“…To efficiently use the proton beam for particle production, both targets are aligned in a cascade scheme, with the graphite target placed 33 m upstream of the neutron target. For both sources, the 3 GeV proton beam is delivered from a rapid cycling synchrotron (RCS) to the targets by the 3NBT (3 GeV RCS to Neutron facility Beam Transport) [4,5] Before injection into the RCS, the proton beam is accelerated up to 0.4 GeV by a LINAC. The beam is accumulated in two short bunches and accelerated up to 3 GeV in the RCS.…”

Section: Introductionmentioning

confidence: 99%

The measurements of neutron energy spectrum at 180 degrees with the mercury target at J-PARC

Matsuda¹,

Meigo²,

Iwamoto³

2018

J. Phys.: Conf. Ser.

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Abstract. Spallation neutron production at 180 degrees is of importance for an evaluation of radiation protection for ADS (Accelerator-Driven System) and nuclear physics. It was, however, quite difficult to measure this. We measured the energy spectrum of spallation neutron at 180 degrees at the proton transport beam line (3NBT) to MLF (Materials and Life Science Experimental Facility) on J-PARC using a NE213 liquid scintillator. The irradiated proton energy was 3 GeV, and the intensity was 1 × 10 10 protons. The neutron energy was determined by a Time-Of-Flight method with n-gamma discrimination. We also simulated the energy spectrum by using the PHITS code and compared this with measured spectrum. In this paper, the overview of the experiment and the results are described.

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“…The proton beam is accelerated up to 0.4 GeV by a linac and accumulated in 2 short bunches, and then accelerated up to 3 GeV in the Rapid Cycling Synchrotron (RCS), resulting to have a structure of a 150 ns bunch width with a spacing of 600 ns per 1 macro pulse. The beam extracted from the RCS is delivered to the spallation neutron source through the 3 GeV RCS to Neutron Facility Beam Transport (3NBT) [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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

Tazaki

Haga

Teshigawara

et al. 2017

QuBS

Self Cite

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Abstract:At the Japan Proton Accelerator Research Complex (J-PARC), a pulsed spallation neutron source provides neutrons with high intensity and narrow pulse width pulse to promote researches on a variety of science in the Materials and Life Science Experimental Facility (MLF). It was designed to be driven by a proton beam with an energy of 3 GeV, a power of 1 MW at a repetition rate of 25 Hz, that is world's highest power level. It is still on the way towards the goal to accomplish the operation with a 1 MW proton beam. In this review, distinctive features of the target-moderator-reflector system of the pulsed spallation neutron source are presented.

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Beam commissioning for neutron and muon facility at J-PARC

Cited by 24 publications

References 5 publications

Polarized neutron diffraction and its application to spin density studies

Polarized neutron diffraction and its application to spin density studies

The measurements of neutron energy spectrum at 180 degrees with the mercury target at J-PARC

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

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