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"m=1" coatings for neutron guides

Cooper-Jensen, Carsten LU ; Vorobiev, A.; Klinkby, E.; Kapaklis, V.; Wilkens, H.; Rats, D.; Hjorvarsson, B.; Kirstein, Oliver LU and Bentley, Phillip LU (2014) International Workshop on Neutron Optics and Detectors (NOP&D) In International Workshop on Neutron Optics and Detectors (NOP&D 2013) 2–5 July 2013, Munich, Germany 528. p.012005-012005
Abstract
A substantial fraction of the price for a supermirror neutron guide system is the shielding, which is needed because of the gamma radiation produced as a result of neutron absorption in the supermirror layers. Traditional coatings have been made of nickel-titanium heterostructures, but Ni and Ti also have a fairly high absorption cross section for cold and thermal neutrons. We examine a number of alternatives to Ni as part of a study to reduce the gamma radiation from neutron guides. Materials such as diamond and Be have higher neutron scattering density than Ni, smaller absorption cross section, and when a neutron is absorbed they emit gamma photons with lower energies. We present reflectivity data comparing Ni with Be and preliminary... (More)
A substantial fraction of the price for a supermirror neutron guide system is the shielding, which is needed because of the gamma radiation produced as a result of neutron absorption in the supermirror layers. Traditional coatings have been made of nickel-titanium heterostructures, but Ni and Ti also have a fairly high absorption cross section for cold and thermal neutrons. We examine a number of alternatives to Ni as part of a study to reduce the gamma radiation from neutron guides. Materials such as diamond and Be have higher neutron scattering density than Ni, smaller absorption cross section, and when a neutron is absorbed they emit gamma photons with lower energies. We present reflectivity data comparing Ni with Be and preliminary results from diamond coatings showing there use as neutron guide coatings. Calculations show that Be and diamond coatings emit two orders of magnitude fewer gamma photons compared to Ni, mainly because of the lower absorption cross section. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
International Workshop on Neutron Optics and Detectors (NOP&D 2013) 2–5 July 2013, Munich, Germany
volume
528
pages
012005 - 012005
publisher
IOP Publishing
conference name
International Workshop on Neutron Optics and Detectors (NOP&D)
external identifiers
  • wos:000340245000005
  • scopus:84906266649
ISSN
1742-6588
1742-6596
DOI
10.1088/1742-6596/528/1/012005
language
English
LU publication?
yes
id
0b78af62-fa6a-40b8-bfff-32162006348b (old id 4665621)
date added to LUP
2014-09-25 15:05:31
date last changed
2017-01-01 04:11:29
@inproceedings{0b78af62-fa6a-40b8-bfff-32162006348b,
  abstract     = {A substantial fraction of the price for a supermirror neutron guide system is the shielding, which is needed because of the gamma radiation produced as a result of neutron absorption in the supermirror layers. Traditional coatings have been made of nickel-titanium heterostructures, but Ni and Ti also have a fairly high absorption cross section for cold and thermal neutrons. We examine a number of alternatives to Ni as part of a study to reduce the gamma radiation from neutron guides. Materials such as diamond and Be have higher neutron scattering density than Ni, smaller absorption cross section, and when a neutron is absorbed they emit gamma photons with lower energies. We present reflectivity data comparing Ni with Be and preliminary results from diamond coatings showing there use as neutron guide coatings. Calculations show that Be and diamond coatings emit two orders of magnitude fewer gamma photons compared to Ni, mainly because of the lower absorption cross section.},
  author       = {Cooper-Jensen, Carsten and Vorobiev, A. and Klinkby, E. and Kapaklis, V. and Wilkens, H. and Rats, D. and Hjorvarsson, B. and Kirstein, Oliver and Bentley, Phillip},
  booktitle    = {International Workshop on Neutron Optics and Detectors (NOP&D 2013) 2–5 July 2013, Munich, Germany},
  issn         = {1742-6588},
  language     = {eng},
  pages        = {012005--012005},
  publisher    = {IOP Publishing},
  title        = {"m=1" coatings for neutron guides},
  url          = {http://dx.doi.org/10.1088/1742-6596/528/1/012005},
  volume       = {528},
  year         = {2014},
}