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Pulse-burst laser systems for fast Thomson scattering (invited).

D J Den Hartog¹, J R Ambuel, M T Borchardt

¹Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA. djdenhar@wisc.edu

The Review of Scientific Instruments

|November 2, 2010

Summary

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Two flashlamp-pumped Nd:YAG lasers were upgraded for pulse-burst capability, enabling high-repetition-rate measurements for plasma diagnostics. This advancement enhances the study of electron temperature dynamics in fusion research.

Area of Science:

Plasma Physics
Laser Technology
Fusion Energy Research

Background:

Nd:YAG lasers are crucial for plasma diagnostics.
Existing systems require upgrades for higher temporal resolution.

Purpose of the Study:

To enhance Nd:YAG lasers with "pulse-burst" capability.
To improve Thomson scattering diagnostics for plasma research.

Main Methods:

Upgraded commercial flashlamp-pumped Nd:YAG lasers.
Implemented insulated gate bipolar transistor (IGBT) switching for variable flashlamp pulse width.
Directly controlled Pockels cell for optimal pulse energy extraction.

Main Results:

Achieved pulse-burst capability with up to 15 pulses of 2 J at 1-12.5 kHz.

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Demonstrated ability to extract up to four 2 J pulses per flashlamp pulse.

Developed a custom system with 250 kHz repetition rate.

Conclusions:

The upgraded Nd:YAG lasers provide enhanced temporal resolution for plasma diagnostics.
These advancements facilitate detailed studies of electron temperature profiles and fluctuations.
New laser systems are critical for future fusion energy investigations.