Jiao – Page 2 – Jiao Lin

Interactive plots for ARCS flux/resolution

Web tools

by Jiao on October 21, 2018

is now available at https://arcs.pages.ornl.gov/resolution

The plots allow users to make educated decision about choosing the Fermi chopper settings.

This plot allows users to see the trade-off between resolution and flux, when incident energy is fixed.

This plot shows an over view of how resolution depends on the incident energy and the choice of Fermi chopper selection.

iMars3D: Neutron tomography reconstruction

by Jiao on October 21, 2018

A snapshot of a neutron CT reconstruction.

Neutron has greater penetration depths and has different cross section dependency on elements than X-ray. Neutron tomography can be used to study a variety of larger samples and is finding applications in engineering, material science, biology, and archeology. This package is in use by ORNL neutron imaging beamlines for neutron CT reconstructions.

Source code

First automatic CT reconstruction for the CG-1D beamline at HFIR

Software

by Jiao on September 15, 2018

New metadata added to images acquired at CG-1D beamline to identify grouping of CT scans
Auto-discovery of the image files improved for a CT scan, including open beam and dark field images based on measurement time
Auto-cropping algorithm improved to work with more measurement scenarios, especially those with slits
New trigger from Cataloging service added to start the auto reduction service for CG1D
Auto-reconstruction script implemented
First successful auto-reconstruction happened Sept. 13, 2018

SEQUOIA detector calibration

Research

by Jiao on March 18, 2018

Detector geometry calibration was performed using powder Si and C60 calibration datasets to better determine the positions and orientation of detector packs in the SEQUOIA instrument.
Positioning of some detector packs were significantly improved

A website for this calibration work is at https://sns-chops.github.io/SEQ-IDF-12292017/

Multiphonon

Software

by Jiao on March 18, 2018

Obtain phonon density of states from neutron DGS data, applying multiphonon corrections.

SEQUOIA detector calibration

by Jiao on January 7, 2018

Powder diffraction data were used to calibrate the position of detector packs for the SEQUOIA instrument.

DrChops

Software

by Jiao on April 10, 2016

First reduction software to reduce event data from a direct-geometry spectrometer.

histogram

Software

by Jiao on December 20, 2015

histogram is a simple python data object for storing data and metadata of histograms. It uses numpy for data arrays, and has a simple hdf5 file reader/writer. It can be installed by using conda: