Definitions
HIDRA Project File
Definition
The HIDRA project file contains reduced data, which may contain multiple runs. There are several levels reduced data for an engineering diffraction experiment project, such as diffraction patterns, fitted peaks and calculated strains/stresses. This project file shall store information about measured diffraction patterns (intensity vs \(2\theta\)) and results from single peak fitting. Strain/stress results are not stored in individual project files because these calculations rely on information from addition project files (d0 and additional strain components).
Here is a list of reduced data that will be stored in project file
Raw experimental data presented as neutron intensity on each pixel (not by default)
Histogram data vectors - \(2\theta\) - intensity - estimated intensity uncertainty
Instrument geometry parameters
Calibrated instrument geometry parameters
Fitted peaks’ parameters
File Structure
The HIDRA project file utilizes an HDF5 file format with the following organizational tree structure.
Instrument - Geometry parameters: table of parameters - Geometry calibration:
Calibration file
Calibration run
Calibration date
Table of calibrated parameters
Mask - detector
default detector masked used to exclude pixels near the edge of the detector
Peaks - HKL_0
chi2
d reference
d reference error
fitting error
parameters
sub-runs
HKL_1
… …
Raw Data - logs
logs for motor positions and metadata information for each sub-run
sub-runs
intensity count vs pixel vectors (by default not saved)
reduced diffraction data - 2theta
\(2\theta\) vectors for each sub-run
main
count vectors for each sub-run
main_var
estimated error in counts for each sub-run
main_XANG
count vectors for each sub-run for a given out-of-plane angle (X)
main_XANG_var
estimated error in counts for each sub-run for a given out-of-plane angle (X)