Optimization of focusing supermirror neutron guides for low γ-background

A. Szakál, Sz Czifrus, M. Markó, J. Füzi, L. Rosta, L. Cser

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Supermirror coating is a significant source of γ-radiation in neutron guide systems, which can cause serious problems at instruments by increasing the γ-background. This problem is more stringent in case of γ-sensitive signal detection, like PGAA or in-beam Mössbauer spectroscopy. Shielding possibilities close to the sample are limited, but guide shape has significant effect on the number of γ-photons produced in this region. To develop good γ-shielding and guide system we have to understand the source and transport of γ-radiation in neutron guides and surrounding shieldings. We have developed a program which integrate VITESS and MCNPX to calculate the γ-background. We compared the simulated γ-background and guide performance with measurements on real focusing guide configurations.

Original languageEnglish
Pages (from-to)S130-S133
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume634
Issue number1 SUPPL.
DOIs
Publication statusPublished - Apr 1 2011

Keywords

  • Background
  • Neutron guide
  • Supermirror

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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