Efficient multi-keV X-ray sources from Ti-doped aerogel targets

Area of Science:

• Atomic Physics
• Plasma Physics
• Laser-driven X-ray Production

Background:

• Low-density aerogel targets doped with high-Z elements are investigated for efficient X-ray generation.
• Understanding X-ray emission mechanisms in laser-produced plasmas is crucial for various applications.

Purpose of the Study:

• To measure and maximize the production of approximately 4.7 keV X-rays from titanium-doped aerogel targets.
• To investigate the relationship between laser power and X-ray output in this specific target configuration.

Main Methods:

• Utilized forty OMEGA laser beams (0.351 microm wavelength) delivering 7 to 14 TW of power to cylindrical targets.
• Employed a two-channel crystal spectrometer and filtered aluminum X-ray diodes for spectral resolution and absolute X-ray emission measurement.
• Characterized laser-target interaction, including full ionization and supersonic excitation of high-Z ions.

Main Results:

• Measured X-ray output ranging from 40 to 260 Joules.
• Observed X-ray energies between 4.67 and 5.0 keV, consistent with Ti K-shell emission.
• Demonstrated effective X-ray generation from laser-irradiated, Ti-doped aerogel targets.

Conclusions:

• Low-density titanium-doped aerogel targets efficiently produce multi-keV X-rays when irradiated by high-power lasers.
• The experimental setup at the OMEGA laser facility is capable of precisely measuring absolute X-ray yields in this energy range.
• Optimized laser-plasma interactions can lead to significant X-ray output for potential applications.