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Neutron guide-split: A high performance guide bundle concept for elliptical guides

In English

Författare

  • Sonja L. Holm
  • Nina Rasmussen
  • Louise Hopfner
  • Mads Bertelsen
  • Joerg Voigt
  • Ken Andersen
  • Kim Lefmann

Summary, in English

We present a new guide-split concept for transporting cold and thermal neutrons to multiple instruments from a single beam port at a neutron facility without compromising the useful neutron brilliance notably for any of the instruments. Elliptical guides are capable of transporting an almost completely filled phase space within a large divergence (+/- 2 degrees for cold neutrons). It is therefore possible to place several secondary guides side by side pointing in slightly different directions using the end of a primary guide as a virtual source. The instruments placed at the secondary guides hence exploit different parts of the phase space transported by the primary guide. In addition, the resulting kink between the primary and secondary guide eliminates line of sight. Using ray-tracing simulations of three different set-ups (with two, four, and eight secondary guides) we show that it is possible to illuminate at least eight sample positions from one beam port with a brilliance transfer above 90% on each sample on a 150 m long instrument. This has been clone for a phase space volume comprised of an area of 1 x 1 cm(2) and a maximum divergence of +/- 0.5 degrees within a wavelength band of 425-5.75 angstrom. We show, by a full virtual experiment, an example of applying the guide-split concept to an instrument proposed for the European Spallation Source, namely a magnetism diffractometer. (C) 2015 Elsevier B.V. All rights reserved,

Publiceringsår

2015

Språk

Engelska

Sidor

1-8

Publikation/Tidskrift/Serie

Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment

Volym

782

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Accelerator Physics and Instrumentation

Nyckelord

  • McStas
  • Monte Carlo
  • Ray tracing
  • Neutron guide
  • ESS

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0167-5087