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Vanadium-based neutron Beam Monitor
- Source :
- Physical Review Accelerators and Beams, Vol 23, Iss 7, p 072901 (2020)
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- A prototype quasi-parasitic thermal neutron beam monitor based on isotropic neutron scattering from a thin natural vanadium foil and standard $^3$He proportional counters is conceptualized, designed, simulated, calibrated, and commissioned. The European Spallation Source designed to deliver the highest integrated neutron flux originating from a pulsed source is currently under construction in Lund, Sweden. The effort to investigate a vanadium-based neutron beam monitor was triggered by a list of requirements for Beam Monitors permanently placed in the ESS neutron beams in order to provide reliable monitoring at complex beamlines: low attenuation, linear response over a wide range of neutron fluxes, near to constant efficiency for neutron wavelengths in a range of 0.6-10 \r{A}, calibration stability and the possibility to place the system in vacuum are all desirable characteristics. The scattering-based prototype, employing a natural vanadium foil and standard $^3$He proportional counters, was investigated at the V17 and V20 neutron beamlines of the Helmholtz-Zentrum in Berlin, Germany, in several different geometrical configurations of the $^3$He proportional counters around the foil. Response linearity is successfully demonstrated for foil thicknesses ranging from 0.04 mm to 3.15 mm. Attenuation lower than 1% for thermal neutrons is demonstrated for the 0.04 mm and 0.125 mm foils. The geometries used for the experiment were simulated allowing for absolute flux calibration and establishing the possible range of efficiencies for various designs of the prototype. The operational flux limits for the beam monitor prototype were established as a dependency of the background radiation and prototype geometry. The herein demonstrated prototype monitors can be employed for neutron fluxes ranging from $10^3-10^{10}$ n/s/cm$^2$.
- Subjects :
- Nuclear and High Energy Physics
Materials science
Physics - Instrumentation and Detectors
Physics and Astronomy (miscellaneous)
Physics::Instrumentation and Detectors
FOS: Physical sciences
Large scale facilities for research with photons neutrons and ions
Neutron scattering
01 natural sciences
Optics
Neutron flux
0103 physical sciences
Calibration
Spallation
Neutron
lcsh:Nuclear and particle physics. Atomic energy. Radioactivity
010306 general physics
010308 nuclear & particles physics
business.industry
Surfaces and Interfaces
Instrumentation and Detectors (physics.ins-det)
Neutron radiation
Neutron temperature
lcsh:QC770-798
Physics::Accelerator Physics
business
Beam (structure)
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Physical Review Accelerators and Beams, Vol 23, Iss 7, p 072901 (2020)
- Accession number :
- edsair.doi.dedup.....9991d343230e74c21f434e07b3654eeb
- Full Text :
- https://doi.org/10.48550/arxiv.2002.10108