A split imaging spectrometer for temporally and spatially resolved titanium absorption spectroscopy.

Area of Science:

• Plasma physics
• Materials science
• Spectroscopy

Background:

• Accurate temperature diagnostics are crucial for understanding dynamic material behavior under extreme conditions.
• Titanium (Ti) K-edge spectroscopy offers a sensitive probe for electronic structure and temperature.

Purpose of the Study:

• To develop and present a novel, temporally and spatially resolved spectrometer for titanium x-ray absorption spectroscopy.
• To enable the measurement of spatially dependent material temperature using Ti absorption features.

Main Methods:

• Utilized an elliptical crystal spectrometer design for simultaneous acquisition of 2p and 3p Ti absorption lines.
• Employed two axial symmetric lines-of-sight for cross-validation and spatial resolution.
• Recorded data using a two-strip framing camera for time-gated measurements.
• Designed for compatibility with high-energy laser facilities like OMEGA and the National Ignition Facility (NIF).

Main Results:

• Demonstrated the capability to acquire temporally and spatially resolved Ti x-ray absorption spectra.
• Enabled inference of spatially dependent material temperature by analyzing the 2p and 3p Ti absorption features.
• The instrument is suitable for diagnosing conditions behind Marshak waves in radiatively driven materials.

Conclusions:

• The presented spectrometer provides a powerful new tool for advanced materials research in high-energy-density physics.
• It allows for non-invasive temperature measurements in dynamic, extreme environments.
• The design facilitates critical validation of material models in inertial confinement fusion relevant experiments.