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Sökning: WFRF:(Petrenko V. I.)

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  • Milstead, David A., et al. (författare)
  • The active muon shield in the SHiP experiment
  • 2017
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • The SHiP experiment is designed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. An essential task for the experiment is to keep the Standard Model background level to less than 0.1 event after 2 x 10(20) protons on target. In the beam dump, around 10(11) muons will be produced per second. The muon rate in the spectrometer has to be reduced by at least four orders of magnitude to avoid muon-induced combinatorial background. A novel active muon shield is used to magnetically deflect the muons out of the acceptance of the spectrometer. This paper describes the basic principle of such a shield, its optimization and its performance.
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3.
  • Avetisyan, A., et al. (författare)
  • Preface
  • 2019
  • Ingår i: APSSE 2019 Actual Problems of System and Software Engineering. - : CEUR-WS. ; , s. 1-2
  • Konferensbidrag (refereegranskat)
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4.
  • Avdeev, M. V., et al. (författare)
  • Comparative structure analysis of magnetic fluids at interface with silicon by neutron reflectometry
  • 2015
  • Ingår i: Applied Surface Science. - : Elsevier BV. - 0169-4332 .- 1873-5584. ; 352, s. 49-53
  • Tidskriftsartikel (refereegranskat)abstract
    • The adsorption of surfactant coated magnetic nanoparticles from highly stable magnetic fluids on crystalline functionalized silicon is studied by neutron reflectometry. Two types of magnetic fluids based on nanomagnetite dispersed and stabilized in non-polar organic solvent (deuterated benzene) and strongly polar solvent (heavy water) are considered. In both cases the interface shows the formation of just one well-defined adsorption layer of nanoparticles, which is insensitive to the effect of the external magnetic field. Still, the particle concentration in the benzene-based fluid is higher in the vicinity to the silicon surface as compared to the bulk distribution. Despite the presence of an aggregate fraction in the water-based system the width of the adsorption layer is consistent with the size of separated particles, thus showing the preferable adsorption of non-aggregated particles.
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