Information for HB-2A users

Instrument Overview: An article titled "The high-resolution powder diffractometer at the high flux isotope reactor" details capabilities and specifications. The full Powder Suite at ORNL, including HB-2A, is outlined in a recent Powder Suite article
 


User Guides for an experiment at HB-2A

Preparing for your experiment
1) List of available powder sample holders
Check the sample absorption to choose the most suitable holder dimensions: NCNR Neutron Attenuation and Activation Calculator
2) Sample preparation using powder cans 

Instrument training for HFIR users 

Running the experiment: 
Reference guide for doing measurements at HB-2a

Live experiment viewing:
Live instrument display
HB2A monintor shows all completed runs

Looking at the data:
Accessing autoreduced data and combining data
(OLD WAY NO LONGER SUPPORTED: Data reduction instructions) 

Analyzing the data:
Basic analysis: Rietveld Refinement of HB-2A Data Using FullProf Software
Lecture Notes and Step-By-Step examples for Magnetic Strucutre Refinements using Neutron Powder Data: See Lecture notes and examples from 2019 workshop and Lecture Notes (2016 workshop) from recent Magnetic Structure Determination from Neutron Diffraction Data Workshop. 

 


Shipping Addresses for Samples: Full instructions can be found on ORNL User Facilities Sample Handling and Shipping.
 


Sample Environment Capabilities: A list of equipment available at HB-2A can be found in the Sample Environment Equipment Database, this includes specifications and drawings. Ranges of current sample environment conditions are 30mK–1700 K, 0-8 Tesla, 0-2GPa (BeCu clamp cell) and 0-3kbar (Al-helium gas pressure cell). NOTE: All conditions are not attainable simultaneously.

 


Software Downloads for data analysis

  • Graffiti – This program allows the user to download HFIR data to his/her own computer and browse through the scans in the experiment.
  • FullProf and GSAS are Rietveld refinement packages for determination of nuclear and magnetic structures.
  • SaraH – contains the user friendly magnetic structure analysis programs SARAh-Representational Analysis and SARAh-Refine. SARAh uses representational analysis to calculate 'symmetry allowed magnetic structures' that can then be directly utilized in Fullprof or GSAS.
  • Bilbao Crystallographic Server - contains magnetic symmetry information, tutorials and examples.

Calibration Standards


Calculation of Sample Absorption Correction: (mu) * (R)
Obtain mu [cm-1] using NCNR Neutron Attenuation and Activation Calculator
R is radius of powder can used for measurement, see List of available powder sample holders for sample can dimensions.


Acknowledgement Statement for User Publications

Intent to Publish: As a condition for performing nonproprietary research, the US Department of Energy requires users to publish results from their research. Authorship of publications based on research from these facilities should reflect the normal considerations of recognizing collaborations. It is also important to take into account the considerable efforts of the instrument scientists in their role of designing, constructing, and/or operating the instrument and related facilities. Results are typically published in peer-reviewed journals, proceedings, or presentations at technical conferences. Proprietary users are not required to publish.

Credit Line: All publications based on work done in whole, or in part, at the Spallation Neutron Source or the High Flux Isotope Reactor at Oak Ridge National Laboratory should acknowledge the facility (or facilities) with this required statement:

This research [or, A portion of this research] used resources at the High Flux Isotope Reactor [and/or Spallation Neutron Source, as appropriate], a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

In addition, users are asked to credit the instrument(s) used in the body of the paper.

Contribute to Our Publication Records: After your results have been published submit the papers citation information via the Publications Portal.