Development of a software package for solid-angle calculations using the Monte Carlo method

Zhang, Jie; Chen, Xiulian; Li, Gang; Xu, Jiayun; Sun, Guangai

doi:10.1016/j.nima.2013.10.048

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…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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“…The relative statistical uncertainty at a 95% confidence level of each count was calculated from the following relation [21],…”

Section: Detection Geometrymentioning

confidence: 99%

Monte Carlo Simulation of γ − γ Correlation Functions

Omer

Bakr

2020

Atoms

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γ − γ correlation functions are mathematical expressions that describe the angular distribution of cascade γ -rays emitted from an atomic nucleus. Cascade transitions may occur in either a two-step deexcitation or through an excitation-deexcitation process of a particular energy level inside the nucleus. In both cases, the nucleus returns to its ground energy state. Spin and parity of the excited state can be determined experimentally using the asymmetry of the angular distribution of the emitted radiation. γ − γ correlation functions are only valid for point-like targets and detectors. In the real experiments, however, neither the target nor the detector is point-like. Thus, misassignment of the spin-parity of energy levels may easily take place if only the analytical equations are considered. Here, we develop a new Monte Carlo simulation method of the γ − γ correlation functions to account for the extended target and detector involved in spin-parity measurements using nuclear resonance fluorescence of nuclei. The proposed simulation tool can handle arbitrary geometries and spin sequences. Additionally, we provide numerical calculations of a parametric study on the influence of the detection geometry on the angular distribution of the emitted γ -rays. Finally, we benchmark our simulation by comparing the simulation-estimated asymmetry ratios with those measured experimentally. The present simulation can be employed as a kernel of an implementation that simulates the nuclear resonance fluorescence process.

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“…Geant4 is a powerful tool that can be used to simulate the transport of particles [19], and Geant4.10.01.p02 release was used in this study. The major procedure using Geant4 to re-display the problem is described below.…”

Section: Jinst 12 P10007mentioning

confidence: 99%

Performance improvement of the high resolution neutron diffractometer at CAEP with Geant4 simulation

et al. 2017

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The newly-built high resolution neutron diffractometer (HRND) at China Academy of Engineering Physics (CAEP) could not acquire high-quality diffraction patterns. In order to solve the problem, the present work introduces the Monte Carlo method based software called Geant4 which is rarely applied in the field of neutron diffraction. The geometrical structure of HRND has been structured by Geant4, thus simulation results can not only re-display the problems of HRND but help to solve such problems as well. According to the simulation results, some effective measures have been carried out to obtain higher instrument performance. It is found that the performance of HRND is improved eventually after new experimental diffraction patterns are acquired. K: Analysis and statistical methods; Simulation methods and programs; Detector alignment and calibration methods (lasers, sources, particle-beams); Neutron diffraction detectors 1Corresponding author.

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Development of a software package for solid-angle calculations using the Monte Carlo method

Cited by 15 publications

References 10 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

Monte Carlo Simulation of γ − γ Correlation Functions

Performance improvement of the high resolution neutron diffractometer at CAEP with Geant4 simulation

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