Advanced

First experimental implementation of pulse shaping for neutron diffraction on pulsed sources

Russina, M.; Kali, Gy; Santa, Zs and Mezei, Ferenc LU (2011) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 654(1). p.383-389
Abstract
One of the central issues in the design and the use of pulsed neutron sources is the control of pulse length in elastic scattering experiments, most significantly diffraction on crystalline matter. On the existing short pulse spallation sources the strongly wavelength dependent source pulse length that determines the resolution is permanently fixed on each beam line by the type of the moderator it faces. We have experimentally implemented for the first time the wavelength frame multiplication (WFM) multiplexing chopper method, an earlier proposed variant of the by now fully tested repetition rate multiplication technique for inelastic scattering spectroscopy on pulsed neutron sources. We have operated the time-of-flight diffractometer at... (More)
One of the central issues in the design and the use of pulsed neutron sources is the control of pulse length in elastic scattering experiments, most significantly diffraction on crystalline matter. On the existing short pulse spallation sources the strongly wavelength dependent source pulse length that determines the resolution is permanently fixed on each beam line by the type of the moderator it faces. We have experimentally implemented for the first time the wavelength frame multiplication (WFM) multiplexing chopper method, an earlier proposed variant of the by now fully tested repetition rate multiplication technique for inelastic scattering spectroscopy on pulsed neutron sources. We have operated the time-of-flight diffractometer at the continuous reactor source at BNC in an unconventional multiplexing mode that emulates a pulsed source. As a full proof of principle of the WFM method we have experimentally demonstrated the extraction from each source pulse a series of polychromatic, chopper shaped neutron pulses, which can continuously cover any wavelength band. The achieved 25 mu s FWHM pulse length is shorter than that can be obtained at all at short pulse spallation sources for cold neutrons. The method allows us to build efficient, high and variable resolution diffractometers at long pulse spallation sources. (C) 2011 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Neutron diffraction, Neutron diffraction at pulsed sources, Neutron, instrumentation, Spallation neutron sources, Elastic neutron scattering, at pulsed sources, Long pulse spallation sources, Repetition rate, multiplication, Wavelength frame multiplication, Neutron pulse shaping, Multiplexing neutron beam chopper systems
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
654
issue
1
pages
383 - 389
publisher
Elsevier
external identifiers
  • wos:000295765100054
  • scopus:80052891194
ISSN
0167-5087
DOI
10.1016/j.nima.2011.05.077
language
English
LU publication?
yes
id
bb188d53-f171-4a8d-99e1-14d11eb0a44f (old id 2207695)
date added to LUP
2011-11-28 09:50:26
date last changed
2017-08-20 04:10:48
@article{bb188d53-f171-4a8d-99e1-14d11eb0a44f,
  abstract     = {One of the central issues in the design and the use of pulsed neutron sources is the control of pulse length in elastic scattering experiments, most significantly diffraction on crystalline matter. On the existing short pulse spallation sources the strongly wavelength dependent source pulse length that determines the resolution is permanently fixed on each beam line by the type of the moderator it faces. We have experimentally implemented for the first time the wavelength frame multiplication (WFM) multiplexing chopper method, an earlier proposed variant of the by now fully tested repetition rate multiplication technique for inelastic scattering spectroscopy on pulsed neutron sources. We have operated the time-of-flight diffractometer at the continuous reactor source at BNC in an unconventional multiplexing mode that emulates a pulsed source. As a full proof of principle of the WFM method we have experimentally demonstrated the extraction from each source pulse a series of polychromatic, chopper shaped neutron pulses, which can continuously cover any wavelength band. The achieved 25 mu s FWHM pulse length is shorter than that can be obtained at all at short pulse spallation sources for cold neutrons. The method allows us to build efficient, high and variable resolution diffractometers at long pulse spallation sources. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Russina, M. and Kali, Gy and Santa, Zs and Mezei, Ferenc},
  issn         = {0167-5087},
  keyword      = {Neutron diffraction,Neutron diffraction at pulsed sources,Neutron,instrumentation,Spallation neutron sources,Elastic neutron scattering,at pulsed sources,Long pulse spallation sources,Repetition rate,multiplication,Wavelength frame multiplication,Neutron pulse shaping,Multiplexing neutron beam chopper systems},
  language     = {eng},
  number       = {1},
  pages        = {383--389},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment},
  title        = {First experimental implementation of pulse shaping for neutron diffraction on pulsed sources},
  url          = {http://dx.doi.org/10.1016/j.nima.2011.05.077},
  volume       = {654},
  year         = {2011},
}