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
1. Sample preparation using powder cans 
2. List of available powder sample holders 
3. Data reduction instructions
4. Reference guide for doing measurements at HB-2a
5. Instrument training for HFIR users 
6. 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 (2016 workshop) from the 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.

Access to HB-2A Data: Experimental files are accessible on the instrument using the Spectrometer Instrument Control Environment (SPICE) data acquisition and data reduction system. Data may be accessed and reduced remotely from a secure server using the HFIR Graffiti software. A step-by-step guide to downloading and reducing HB-2A data into FullProf or GSAS file format is available.

Additional Software Downloads

  • 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: We would greatly appreciate it if you let us know that you are submitting your results for publication. After your results have been published submit the papers citation information via the Publications Portal.