Neutron Sciences 2008 Annual Report - 17.79 MB - Spallation ...

compressed upon file write and are automatically
decompressed upon file read—a benefit of working
with HDF5. Histograms may typically compress up
to 95%, significantly reducing needed disk space.
The computing development team continues to spend
significant effort producing and refining data reduction
and diffraction software for both the instruments
in the user program and those still in commissioning.
The figure at right illustrates the Liquids
Reflectometer reduction graphical user interface
(GUI) as seen remotely via the portal; data and computing
reside at SNS, while the GUI appears on the
user’s computer.
The development team has also been working closely
with a number of external experts to improve our capabilities.
One such collaboration is the Neutron TeraGrid
Science Gateway team, headed by John Cobb.
This team has integrated a McStas simulation ap-
plication that is accessible
via the portal while running
via a community account
on the National Science
Foundation TeraGrid. We’ve
also been working with Ruth
and Dennis Mikkelson of the
Integrated Spectral Analysis
Workbench (ISAW)
software development team.
The Mikkelsons have been
adapting ISAW to work
with the SNS single-crystal
instruments SNAP and
TOPAZ.
Contact: Steve Miller
(millersd@ornl.gov)
neutrons.ornl.gov/instrument_systems/computing
New ISAW visualization tool
that can display in log scale.
FACILITY DEVELOPMENT 2008 ANNUAL REPORT
Data reduction GUI for the Liquids Reflectometer at
SNS. When used remotely, the application is displayed
locally on a user’s computer, while the data reside and
processing occurs on computers at SNS. Remote applications
are facilitated via a web browser running on a
user’s computer, which establishes an NX client “pipe”
between the application displayed on the user’s computer
and the SNS servers where it is actually running
remotely.
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FACILITY DEVELOPMENT