Search

Your search keyword '"Pokhilchuk, K."' showing total 4 results
Start Over Author "Pokhilchuk, K."
4 results on '"Pokhilchuk, K."'

2. Opening the terahertz window on the OSIRIS spectrometer

Author

Demmel F., McPhail D., Crawford J., Maxwell D., Pokhilchuk K., Garcia-Sakai V., Mukhopadyay S., Telling M.T.F., Bermejo F.J., Skipper N.T., and Fernandez-Alonso F.

Subjects
Physics, QC1-999
Abstract

A cooled and mechanically retractable beryllium filter has been installed and commissioned on the low-energy OSIRIS spectrometer at ISIS. This instrument development extends the energy-transfer range of the spectrometer up to ca. 20 meV (∼ 5 THz), leading to an excellent resolution at THz frequencies and substantial gains in detected flux relative to existing capabilities on the neighbouring IRIS spectrometer. Herein, we provide a concise account of this new capability for high-resolution neutron spectroscopy in the THz domain, as well as outline a number of ongoing and potential scientific opportunities in condensed-matter physics, chemistry, and materials science.

Published
2015
Full Text
View/download PDF

3. Opening the terahertz window on the OSIRIS spectrometer

Author

Science and Technology Facilities Council (UK), Demmel, F., McPhail, D., Crawford, J., Maxwell, D., Pokhilchuk, K., García-Sakai, Victoria, Mukhopadhyay, S., Telling, M.T.F., Bermejo, Francisco Javier, Skipper, N.T., Fernández-Alonso, Félix, Science and Technology Facilities Council (UK), Demmel, F., McPhail, D., Crawford, J., Maxwell, D., Pokhilchuk, K., García-Sakai, Victoria, Mukhopadhyay, S., Telling, M.T.F., Bermejo, Francisco Javier, Skipper, N.T., and Fernández-Alonso, Félix

Abstract

A cooled and mechanically retractable beryllium filter has been installed and commissioned on the low-energy OSIRIS spectrometer at ISIS. This instrument development extends the energy-transfer range of the spectrometer up to ca. 20 meV (∼ 5 THz), leading to an excellent resolution at THz frequencies and substantial gains in detected flux relative to existing capabilities on the neighbouring IRIS spectrometer. Herein, we provide a concise account of this new capability for high-resolution neutron spectroscopy in the THz domain, as well as outline a number of ongoing and potential scientific opportunities in condensed-matter physics, chemistry, and materials science.

Published
2015

4. Monte Carlo modelling of the OSIRIS neutron backscattering spectrometer

Author

Pokhilchuk, K

Abstract

This report focuses on modelling the OSIRIS neutron-backscattering instrument using Monte Carlo methods with the use of the McStas software package. The aim is to match the experimental energy resolution of OSIRIS and thus be able to simulate the instrument in order to investigate its various properties and performance characteristics. Furthermore, understanding quantitatively how different components of OSIRIS contribute towards its resolution function will provide insight into potential upgrade possibilities of the instrument. The simulated energy resolution FWHM values of 23.7 μeV for PG002 and 96.3 μeV for PG004 show a good agreement with the experimental results of 25.0 μeV for PG002 and 99.5 μeV for PG004 and are only 5% and 3% lower respectively.

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results