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Measuring electron heat conduction in non-uniform laser-produced plasmas using imaging Thomson scattering

Spatial profiles of the electron temperature have been measured via imaging Thomson scattering from ion acoustic waves near the critical surface of a laser-produced plasma. Thomson scattered light from a 351 nm probe beam, pointed normal to target surface, is collected and imaged along the direction of the probe beam. From the scattered light, the electron temperature, plasma flow, and electron drifts of the blow off plasma are determined. The experiment is performed with and without a 1053 nm heater beam used to deposit energy near the critical surface and modify the electron temperature. The effect of the heating is observed in the electron temperature profiles on both the high and low density side of the critical surface. Using the configuration demonstrated in this manuscript, it may be possible to measure heat flow in future experiments to directly determine the electron heat conduction.