Ultrafast Dark-Field X-Ray Microscopy of Strain Wave Propagation

DF-XRM data from an X-FEL source captures a strain wave propagating through a diamond single crystal in a stroboscopic fashion. The dataset comprises three experimental runs: a time series with 1 ns steps, a time series with 72 ns steps covering one full period, and a rocking curve. Each run is stored in HDF5 files containing 2000 shots, with header information on X-FEL and laser status for background subtraction.

Use Cases

• Analyzing strain wave propagation dynamics based on the time-series image data.
• Subtracting detector background using shots where the X-FEL beam is off, as indicated by the 'lightStatus_xray' header.
• Calibrating timing by identifying the correct shot time from the strain wave position due to the ±1 ns timing tool error.
• Studying rocking curves for crystal orientation using motor position data from the goniometer in run 536.

Strengths

• Provides stroboscopic imaging data with high temporal resolution (1 ns steps) for observing ultrafast strain dynamics.
• Includes controlled experimental metadata such as X-FEL/laser status and goniometer motor positions for precise analysis.
• Data is associated with a documented experiment from the LCLS facility, referenced in arXiv:2211.01042.

Limitations

• Key metadata such as dataset size, row count, specific column names, and last update date are not provided across sources.
• The timing tool for runs 538 and 540 is unreliable with a ±1 ns error, requiring additional analysis to identify correct shot times.
• The exact number of shots per position is approximate (~120), and the total volume of data is unspecified.

Provenance

Source

Linac Coherent Light Source (LCLS), as referenced.

Collection Method

Experimental data obtained via Dark-Field X-ray Microscopy (DF-XRM) at an X-ray Free-Electron Laser (X-FEL) source.

Time Range

Time-series data with steps of 1 ns and 72 ns (one period).