A collinear self-emission and laser-backlighting imaging diagnostic.

Area of Science:

• Plasma Physics
• Optical Diagnostics
• High-Energy-Density Physics

Background:

• Accurate characterization of transient plasma phenomena requires simultaneous measurements using multiple diagnostic techniques.
• Correlating data from laser-based diagnostics (e.g., interferometry) and self-emission imaging is crucial for understanding complex plasma dynamics.
• Existing methods often require separate lines-of-sight, complicating direct data comparison.

Purpose of the Study:

• To demonstrate a novel optical design enabling collinear laser backlighting and extreme ultraviolet (EUV) self-emission imaging.
• To validate the performance of this design using exploding wire experiments.
• To facilitate direct correlation of laser-derived quantities (e.g., electron density) with EUV emission patterns.

Main Methods:

• Modification of a single optical component within laser collection optics.
• Incorporation of apertures and pinhole arrangements for single or multiple frame imaging onto a gated detector (e.g., microchannel plate).
• Implementation of simple image correlation methods for data analysis.

Main Results:

• Machining the optical component did not degrade the quality of laser backlighting images.
• The modified optic successfully acquired time-resolved EUV self-emission images.
• Even with multi-frame capability, the area loss for collinear imaging was minimal.

Conclusions:

• The developed diagnostic system allows for direct, collinear correlation of laser and self-emission images.
• This technique enhances the ability to derive and compare plasma parameters, such as electron density.
• The design offers a practical and efficient approach for advanced plasma diagnostics.