Optimization of a slab geometry type cold neutron moderator for RIKEN accelerator-driven compact neutron source

Ma, Baolong; Teshigawara, Makoto; Wakabayashi, Y.; Yan, Mingfei; Hanabusa, Takao; Yamagata, Yutaka; Wang, Sheng; Ikeda, Yujiro; Otake, Yoshie

doi:10.1016/j.nima.2021.165079

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…The change in the neutron energy with different temperature is consistent with previous reports [8,9]. It is notable that a gain in the neutron intensity at around 1 meV is a factor of 4 to 5 to that of PE moderator case, although it is rather small compared with that about 6 obtained by design optimization study [10].…”

Section: Neutron Spectrum Measurementsupporting

confidence: 91%

“…It is clearly demonstrated that the cold mesitylene produces appreciable amounts of cold neutron below 10 meV and could serve as cold neutron source even its intensity is low compared with solid methene. It is also suggested that the neutron flux spectrum is consistent with those in the optimization study [10]. It should be noted that measurements are systematically lower by around 15% to 20% than calculations with MCNP calculation using ENDF/B-VII nuclear data.…”

Section: Comparison With Experimentssupporting

confidence: 76%

“…Taking the RANS target, moderator reflector (TMR) configuration into consideration, the system was designed based on optimization results [10] without changing the RANS principal frame structure. A plug system was devised to enable insertion of the cryogenic moderator from the front of the target assembly, which makes the system maintenance efficient and easy without hard labor of shielding removal.…”

Section: Et Al / Experimental Validation Of Cold Neutron Source Perfo...mentioning

confidence: 99%

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Experimental validation of cold neutron source performance with mesitylene moderator installed at RANS

Ikeda

Teshigawara

Yan

et al. 2023

JNR

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The RANS (RIKEN Accelerator driven Neutron Source), one of compact accelerator neutron sources (CANS), tries to expand its performance by installing a cold neutron which may provide new opportunities in many applications. RANS is a low power CANS with a proton beam of 7 MeV and 100 µA at maximum. A moderator system was constructed based on results of optimization design study with mesitylene. Recently, we have done performance tests aiming at showing characteristics as cold neutron source. Cryogenic mesitylene moderator was installed on a plug with a new target moderator reflector configuration of RANS. Experiment using a gas electron multiplier (GEM) detector was carried out to measure neutron spectra of the cold moderator. This paper describes performance of the cold moderator in terms of 1) Cold neutron gain of optimization design with respect to a polyethylene moderator, 2) Temperature dependency of cold neutron spectrum flux regarding scattering kernel (SK), and 3) comparison between experiment and calculation. A note is given for comparison between calculations with different SKs available. Also, two-dimensional imaging of cold and thermal neutron spectrum flux on the viewed surface is shown with a pinhole slit configuration.