High Time-Space Resolved Photography Of Laser Imploded Fusion Targets

G. G. Gregory; S. A. Letzring; M. C. Richardson; C. D. Kiikka

doi:10.1117/12.949875

14 January 1986 High Time-Space Resolved Photography Of Laser Imploded Fusion Targets

G. G. Gregory, S. A. Letzring, M. C. Richardson, C. D. Kiikka

Proceedings Volume 0569, High Speed Photography, Videography, and Photonics III; (1986) https://doi.org/10.1117/12.949875
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

The success of laser fusion research depends upon the efficient, uniform implosion of a spherical target filled with DT fuel. In experimental investigations of these implosions, diagnostics are required which will verify the symmetry of the implosion, and measure accurately the trajectories of the shell components. This data can then be compared to the predictions of one- and two-dimensional hydrocodes to assess the performance of specific target designs. Determining the progress of specific thin shells (< 1 μm) or media-interfaces in the high velocity (> 107 cm sec-1) implosion of a laser fusion target typically of initial diameter - 500 μm, places stringent demands on time-resolving x-ray imaging instrumentation. For direct drive laser fusion studies at LLE, we have developed a time-resolved x-ray imaging system having high time (< 20 ps) and space (> 10 μm) resolving capabilities. This streak pinhole camera system has been used to study the trajectory of the coronal ablative plasma surrounding the imploding target. With the aid of a secondary source of x-ray emission provided by laser irradiation of a separate target, time-resolved x-ray streak radiography of the inward motion of cold material interfaces can be diagnosed. In order to make accurate comparisons with the predictions of one- and two-dimensional hydrocode calculations, it is important to have absolute temporal registration of the x-ray emission to the incident laser light. We will describe approaches being followed to address these requirements and illustrate with experimental data the current technical capabilities of our time-resolved x-ray photographic system.

Citation Download Citation

G. G. Gregory, S. A. Letzring, M. C. Richardson, and C. D. Kiikka "High Time-Space Resolved Photography Of Laser Imploded Fusion Targets", Proc. SPIE 0569, High Speed Photography, Videography, and Photonics III, (14 January 1986); https://doi.org/10.1117/12.949875

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