scholarly journals Exact resolution function for double-disk chopper neutron time-of-flight spectrometers: application to reflectivity

2020 ◽  
Vol 53 (2) ◽  
pp. 464-476 ◽  
Author(s):  
Didier Lairez ◽  
Alexis Chennevière ◽  
Frédéric Ott

The exact resolution function of the transfer vector for the HERMÈS reflectometer at the Laboratoire Léon Brillouin is calculated as an example of a neutron time-of-flight spectrometer with a double-disk chopper. The calculation accounts for the wavelength distribution of the incident beam, the tilt of the chopper axis, collimation and gravity, without an assumption of Gaussian distributions or the independence of these different contributions. A numerical implementation is provided. It is shown that data fitting using this exact resolution function allows much better results to be reached than with the usual approximation by a Gaussian profile.

2002 ◽  
Vol 39 (sup2) ◽  
pp. 685-688 ◽  
Author(s):  
Antonio Brusegan ◽  
Gilles Noguere ◽  
Frank Gunsing

1994 ◽  
Vol 376 ◽  
Author(s):  
Felix B. Altorfer ◽  
Jeremy C. Cook ◽  
John R. D. Copley

ABSTRACTA highly versatile multiple disk chopper neutron time-of-flight spectrometer is being installed at the Cold Neutron Research Facility of the National Institute of Standards and Technology. This new instrument will fill an important gap in the portfolio of neutron inelastic scattering spectrometers in North America. It will be used for a wide variety of experiments such as studies of magnetic and vibrational excitations, tunneling spectroscopy, and quasielastic neutron scattering investigations of local and translational diffusion. The instrument uses disk choppers to monochromate and pulse the incident beam, and the energy changes of scattered neutrons are determined from their times-of-flight to a large array of detectors. The disks and the guide have been designed to make the instrument readily adaptable to the specific performance requirements of experimenters. We present important aspects of the design, as well as estimated values of the flux at the sample and the energy resolution for elastic scattering. The instrument should be operational in 1996.


2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Anatoly M. Balagurov ◽  
Ivan A. Bobrikov ◽  
Sergey V. Sumnikov ◽  
Igor S. Golovin

2008 ◽  
Vol 69 (9) ◽  
pp. 2146-2150 ◽  
Author(s):  
E.S. Božin ◽  
A. Sartbaeva ◽  
H. Zheng ◽  
S.A. Wells ◽  
J.F. Mitchell ◽  
...  

1997 ◽  
Vol 34-35 ◽  
pp. 577-580 ◽  
Author(s):  
Robert E Chrien ◽  
Kenneth A Klare ◽  
Thomas J Murphy ◽  
Lauren A Rauber

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