User Guidance


  • Please feel free to contact instrument scientists regarding your proposal.

Become a SEQUOIA User

Shipping Addresses for Samples 

Quick Start Guides for Sample Changes and PPS

  • We do not often allow users to change their own samples.

Data Reduction and Analysis

  • SEQUOIA uses an autoreduction procedure. If your data needs to be manually reduced, please consult with your local contact.

How to access SEQUOIA data

Help information is available for those with internal access

  1. Create an ORNL Resource account (if you don’t already have one) at the ORNL Guest Portal.
    You can then login to our analysis cluster by clicking on Launch Session in Login credentials will be the same as XCAMS. You can also install ThinLinc client on your local machine. Step by step instructions are provide in the document POWGEN Experiment Guide: A-Z.
  2. Once you login under your home directory you will see the following folder structure/data/SNS/SEQ/IPTS-#/. All the run numbers will appear for your data. Data is automatically reduced .nxs and .nxspe files using the default parameters. Those data can be found in the/shared/autoreduce folder and subdirectories therof. If you fail to see the IPTS-# folder then try /SNS/SEQ/IPTS-#/shared/autoreduce. This is the real location of the file whereas the first one is a symlink.
  3. You can of course re reduce data with other binning values using mantidplot. Please consult with your local contact if you need further information
    Secure ftp or secure shell will allow you to get the data onto your local drive. Select one of the programs below to download: or
  4. Enter the following information to connect to the analysis computers:
    Username and password
    Port: 22

A summary file called with the file extension of .csv can be found in the /SNS/SEQ/IPTS-xxxxx/shared/autoreduce folder which is also where the data is stored (where xxxxx need to be replace by your IPTS #). 

Publishing Your Experiment Results

Users must credit ORNL in all publications resulting from experiments performed at these facilities. In addition, publications, papers, patents, honors and awards, and their citations must be reported to the User Office to assist the facilities in recording the contributions of its users. Each facility (HFIR or SNS or both) must be acknowledged with this statement:

"[A portion of] This research at Oak Ridge National Laboratory's High Flux Isotope Reactor [and/or Spallation Neutron Source, as appropriate] was sponsored by the U.S. Department of Energy, Office of Basic Energy Sciences."

Additionally, we request the citation of a SEQUOIA instrument paper in any peer-reviewed journal publication:

Granroth G.E., Kolesnikov A.I., Sherline T.E., Clancy J.P., Ross K.A., Ruff J.P., Gaulin B.D., Nagler S.E., "SEQUOIA: a newly operating chopper spectrometer at the SNS", Journal of Physics: Conference Series, 251, 12058 (2010).


Stone M.B., Niedziela J., Abernathy D.L., Debeer-Schmitt L.M., Ehlers G., Garlea V.O., Granroth G.E., Graves-Brook M., Kolesnikov A.I., Podlesnyak A.A., Winn B., "A comparison of four direct geometry time-of-flight spectrometers at the Spallation Neutron Source", Review of Scientific Instruments, 85, 4, 045113 (2014).

Please enter publications including dissertations and theses in the Neutron Science Publications Systems. This ensures that the publication will appear on the SEQUOIA publications page.