Four-color laser diagnostics for Z-pinch and laser-produced plasma

Area of Science:

• Plasma Physics
• Laser Technology
• Pulsed Power

Background:

• Z-pinch devices and laser-produced plasmas are crucial for fusion energy research.
• Accurate diagnostics are essential for understanding plasma behavior and evolution.
• Existing laser diagnostics have limitations in probing dense plasma regions.

Purpose of the Study:

• To develop and demonstrate a novel four-color laser diagnostic system.
• To enhance plasma probing capabilities for Z-pinch and laser plasma experiments.
• To enable simultaneous observation of plasma across a wide density range.

Main Methods:

• Utilized a Nd:YAG laser, generating four harmonics (1064, 532, 266, 213 nm) via cascade conversion.
• Integrated four laser wavelengths into a single beampath for simultaneous propagation.
• Employed deep UV (213 nm) probing for improved penetration into dense plasmas.
• Applied four-color laser shadowgraphy and interferometry techniques.

Main Results:

• Successfully developed and implemented a four-color laser diagnostic system for a 1 MA pulsed power generator.
• Demonstrated the capability to probe plasma across a wide range of densities in a single shot.
• Obtained detailed shadowgraphy and interferometry images of wire-array loads and laser-plasma interactions.
• Showcased the advantage of deep UV probing for dense plasma penetration.

Conclusions:

• The developed four-color laser diagnostic system significantly advances plasma characterization capabilities.
• This diagnostic provides a comprehensive tool for studying Z-pinch and laser plasma phenomena.
• The ability to probe diverse plasma densities in one shot offers unprecedented experimental efficiency.