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Sensitivity analysis of the transmission factor and resolution of a multiblade neutron velocity selector to the various parameters

Moeini, H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.radphyschem.2020.109092
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. The neutron velocity selector is a device used to produce a monochromatic neutron beam with continuous flux. The purpose of the present study is to investigate the sensitivity of the transmission factor and resolution of a multiblade neutron velocity selector to the various parameters using the McStas software. To this end, two instruments were created using the Arm, Progress_bar, Source_simple, DivMonitor, L_monitor, Guide_channeled and V_selector components of the McStas software. The used V_selector component to simulate the multiblade neutron velocity selector was created by considering three assumptions: 1. The absorption of colliding neutrons to selector blades, 2. No interaction of the neutron with input and output windows of the selector, and 3. The absorption of neutrons that pass through selector blades, but do not reach the output window of the selector due to great divergence. As a result of the simulations, the transmission factor and resolution of the multiblade selector for the case that the neutron beam entered into the selector have a uniform angular distribution with divergence 6'. The calculated transmission factor and resolution are 94.29 ± 0.05 and 10.52 ± 0.01, respectively. A comparison of these results with the reported experimental values in the reference paper shows that the relative error of the transmission factor and resolution are (0.31± 0.05) % and (5.2± 0.05) %, respectively. © 2020 Elsevier Ltd
  6. Keywords:
  7. McStas ; Multiblade neutron velocity selector ; Resolution ; Transmission factor ; Angular distribution ; Neutron beams ; Neutrons ; Sensitivity analysis ; Velocity ; Continuous flux ; Experimental values ; Input and outputs ; Mcstas softwares ; Monochromatic neutrons ; Neutron velocity selectors ; Output window ; Relative errors ; Transmissions ; Neutron ; Simulation ; Software
  8. Source: Radiation Physics and Chemistry ; Volume 177 , December , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0969806X20304308