Design of an Am–Be neuron source experimental platform at Sichuan University

Chen, Xiulian; Qin, Xue; Liu, Jun; Zhou, Rong; Yang, Chaowen

doi:10.1016/j.apradiso.2020.109443

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Table 1 shows the intrinsic efficiency calculation results, and it illustrates that the intrinsic efficiency of the detector for neutrons is about three orders of magnitude higher than that for 𝛾 rays, i.e., the insensitivity of the detector to 𝛾/X rays is verified. It is worth to noting that all the 𝛾 rays emitted from the Am-Be neutron source [18] were not taken into account in the calculations. The solid angles in table 1 were obtained with a dedicated solid-angle calculation software [19].…”

Section: Characteristics Of Detector Signalsmentioning

confidence: 99%

Development of a high-temporal resolution neutron flux measurement system for the HL-2M tokamak

Zhang

et al. 2022

J. Inst.

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To enhance the understanding of the physics of energetic ions in fusion plasma, a high-temporal resolution neutron flux measurement (HTRNFM) system, which is equipped with a fast-neutron scintillation detector embedded with ZnS:Ag phosphor, has been developed for the HL-2M tokamak. It has a temporal resolution of 10 μs during conventional operations. Its dynamic range is sufficiently wide for neutron flux measurements by adopting the combination use of the scalar mode and the Campbell mode. Based on the Monte Carlo calculations, the applicable count rate ranges of both the scalar mode and the Campbell mode are respectively 0.1–10 Mcps and 10–200 Mcps. The performance validation of the HTRNFM system has been performed by neutron flux measurements in magnetohydrodynamic (MHD) quiet plasmas in the HL-2A tokamak. In another plasma with abundant MHD instabilities, both the continuous neutron flux decreases and the rapid neutron flux decreases caused by different MHD instabilities are observed in a more detailed manner for the first time with the HTRNFM system than with other neutron flux measurement (NFM) systems that have a lower temporal resolution of 1 ms. The HTRNFM system will serve as a powerful diagnostic tool for research on energetic ion confinement quality in the HL-2M tokamak.

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Section: Characteristics Of Detector Signalsmentioning

confidence: 99%

Development of a high-temporal resolution neutron flux measurement system for the HL-2M tokamak

Zhang

et al. 2022

J. Inst.

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“…Among the isotopic neutron sources, americium-beryllium sources are one of the most common neutron sources with the advantages of low cost, good stability and low gamma radiation. The energy of emitted neutrons is between 0 ∼ 11 MeV, and the average energy is about 4.5 MeV, covering the energy range of thermal neutrons, slow neutrons and fast neutrons [20]. Accordingly, in the simulation, we chose the materials and designed the structure of moderator and collimator for the 241 Am- 9 Be source so as to optimize the neutron energy spectrum, increase the ratio of thermal neutrons, and increase the neutron utilization rate for the purpose of detecting thermal neutrons.…”

Section: Jinst 16 P07010mentioning

confidence: 99%

Simulation-based optimization of a thermal neutron detector with SERS method

Chai¹,

Wang²,

Chang³

et al. 2021

J. Inst.

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A Monte Carlo simulation-based optimization of a SERS-based thermal neutron detector is aimed at improving detection efficiency for thermal neutrons. The moderator and collimator have been designed for a 241Am-9Be source to maximize the thermal neutrons flux in the irradiation area. Simulated thermal neutron detection efficiency can be increased to approximately 50.5% when polyethylene is added as neutron reflector and 10B enriched 4-MPBA is used. With Monte Carlo software GEANT4, the SERS-based thermal neutron detector has been proven to have almost no effect on original thermal neutron flux as well as the distribution and could be used for thermal neutron detection accurately.

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Design of an Am–Be neuron source experimental platform at Sichuan University

Cited by 2 publications

References 15 publications

Development of a high-temporal resolution neutron flux measurement system for the HL-2M tokamak

Development of a high-temporal resolution neutron flux measurement system for the HL-2M tokamak

Simulation-based optimization of a thermal neutron detector with SERS method

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