Electronically focused time-of-flight powder diffractometers at the intense pulsed neutron source

1989 ◽  
Vol 22 (4) ◽  
pp. 321-333 ◽  
Author(s):  
J. D. Jorgensen ◽  
J. Faber ◽  
J. M. Carpenter ◽  
R. K. Crawford ◽  
J. R. Haumann ◽  
...  
Keyword(s):  
High Resolution ◽  
Neutron Source ◽  
Rietveld Method ◽  
Time Of Flight ◽  
Scattering Angle ◽  
Wide Range ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Two time-of-flight powder diffractometers have operated at the Intense Pulsed Neutron Source (IPNS) since August 1981. These instruments use dedicated microcomputers to focus time-of-flight events so that data from different detectors can be summed into a single histogram. Thus, large multidetector arrays can be employed at any scattering angle from 12 to 157°. This design permits data to be collected over a uniquely wide range of d spacings while maintaining high resolution and count rates. The performance of the two instruments is evaluated by analyzing data from a standard Al2O3 sample by the Rietveld method. These instruments provide the capability for moderate- to high-resolution measurements with the duration of a typical run being a few hours.

Exploring nuclear photonics with laser driven neutron source

2021 ◽  
Author(s):  
Zechen Lan ◽  
Akifumi Yogo
Keyword(s):  
Neutron Source ◽  
Modern Science ◽  
Current Status ◽  
Science And Engineering ◽  
Broad Energy Range ◽  
Wide Range ◽  
New Type ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source ◽  
Broad Energy

Abstract Neutron beams have been providing dispensable tools for wide range of fields in modern science and engineering. Recently, a new type of pulsed neutron source has been developed, known as Laser-Driven Neutron Source (LDNS). The LDNSs utilize the laser-accelerated ions, including protons and deuterons as a primary beam and generate neutrons from a secondary target (lithium, beryllium, etc.) via nuclear reaction. Applying an additional moderator part, LDNSs can provide a broad energy range of neutrons (meV∼MeV). This paper aims to introduce the current status of LDNS and the results of application-oriented experiments implemented at Institute of Laser Engineering (ILE) of Japan.

A Fast Pulsed Neutron Source for Time-of-Flight Detection of Nuclear Materials and Explosives

2011 ◽  
Author(s):  
Mahadevan Krishnan ◽  
Brian Bures ◽  
Colt James ◽  
Robert Madden ◽  
Wolfgang Hennig ◽  
...  
Keyword(s):  
Neutron Source ◽  
Time Of Flight ◽  
Nuclear Materials ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

High-Resolution Strain Mapping Through Time-of-Flight Neutron Transmission Diffraction

2013 ◽  
Vol 772 ◽  
pp. 9-13 ◽  
Author(s):  
Anton S. Tremsin ◽  
Jason B. McPhate ◽  
John V. Vallerga ◽  
Oswald H.W. Siegmund ◽  
Winfried Kockelmann ◽  
...  
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
Time Of Flight ◽  
Compact Tension ◽  
Strain Mapping ◽  
Neutron Transmission ◽  
Neutron Counting ◽  
Transmission Measurements ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

The spatial resolution of time of flight neutron transmission diffraction was recently improved by the extension of photon/electron counting technology to imaging of thermal and cold neutrons. The development of novel neutron sensitive microchannel plates enables neutron counting with spatial resolution of ~55 um and time-of-flight accuracy of ~1 us, with efficiency as high as 70% for cold and ~40% for thermal neutrons. The combination of such a high resolution detector with a pulsed collimated neuron beam provides the opportunity to obtain a 2-dimensional map of neutron transmission spectra in one measurement. The results of our neuron transmission measurements demonstrate that maps of strains integrated along the beam propagation direction can be obtained with ~100 microstrain accuracy and spatial resolution of ~100 um providing there are sufficient neutron events collected. In this paper we describe the capabilities of the MCP neutron counting detectors and present the experimental results of 2-dimensional strain maps within austenitic steel compact tension (CT) crack samples measured at the ENGIN-X beamline of the ISIS pulsed neutron source.

scholarly journals Neutron Powder Diffraction at a Pulsed Neutron Source: A study of Resolution Effects

1985 ◽  
Vol 29 ◽  
pp. 119-130
Author(s):  
J. Faber ◽  
R. L. Hitterman
Keyword(s):  
Neutron Source ◽  
Time Of Flight ◽  
General Purpose ◽  
Neutron Powder Diffraction ◽  
Scattering Data ◽  
Dependent Data ◽  
Resolution Function ◽  
Flight Data ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

AbstractThe General Purpose Powder Diffractometer (GPPD), a high resolution (∆d/d=0.002) time-of-flight instrument, exhibits a resolution function that is almost independent of d-spacing. Some of the special properties of time-of-flight scattering data obtained at a pulsed neutron source will be discussed. A method is described that transforms wavelength dependent data, obtained at a pulsed neutron source, so that standard structural least-squares analyses can be applied. Several criteria are given to show when these techniques are useful in time-of-flight data analysis.

Sign in / Sign up

Export Citation Format

Share Document