skip to main content NIST Center for Neutron Research NIST Center for Neutron Research National Institute of Standards and Technology
Home Live Data Instruments CHRNS Proposals

DCS Instrument Performance



Beam Intensity as a function of wavelength and resolution

DCS neutron beam intensity (n/s) as function of wavelength The figure on the left shows the measured neutron intensity (neutrons per second) with all choppers running at 20000 rpm, as a function of neutron wavelength and resolution mode. The sharp dips in the beam intensity at 3.35 Å and 6.70 Å are respectively due to (004) and (002) Bragg reflections in the pyrolytic graphite filter.
The graphite filter is used to eliminate high energy neutrons (for a detailed explanation, please look at the reference The optical filter of the disk chopper spectrometer at NIST JRD Copley and JC Cook (2000) Physica B 283 386-388).
Click here to get an interactive graphical interface

DCS neutron beam intensity (n/s) as function of wavelength A detail of the short wavelength region is shown.

Energy resolution as a function of wavelength

DCS Energy resolution as a function of wavelength The lines show the calculated FWHM energy resolution for elastic scattering at a chopper speed of 20000 rpm. The points are measured values of the resolution. The lines represent power law fits to the measurements.
Click here to get an interactive graphical interface

Elastic Scattering Vector, Q, as a Function of Wavelength

Elastic scattering vector, Q, as a function of wavelength The figure on the left shows the upper and lower limits, as well as some intermediate values for the elastic scattering vector as a function of wavelength.
Click here to get an interactive graphical interface

Go to the DCS home page.
Scientific Opportunities | Design Features | Intensity, resolution and Q range
Proposals, Beam Time Requests | Access to the NCNR Facilities | Monetary Assistance Programs
Publications
Source Schedule | Instrument Schedule
Users' guide | Sample Environments | DAVE (Data Analysis Software)
The DCS Instrument Poster | Talks about the DCS | Instrument Details

Go to the NCNR home page.
Go to the NCNR Sample Environments page.
Go to the NCNR Cold Neutron Instruments page.
Go to the NCNR Thermal Neutron Instruments page.

Last modified 15-March-2004 by website owner: NCNR (attn: Bill Kamitakahara)