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9 January 1984 Time Resolved X-ray Photography of Uniformly Irradiated Spherical Targets
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The direct drive approach to laser fusion, in which laser produced ablation of the surface of a spherical shell target induces a high compression of the enclosed fusion fuel, requires a high degree of irradiation uniformity. Diagnosis of the trajectory of this imploding shell can, in principle, provide valuable information on the uniformity of the implosion, as well as verify the predictions of hydrodynamic code simulations. This requires time-resolved x-ray photography of the imploding shell with high temporal (~ 10 ps) and spatial (< 10 μm) resolution. We report recent time-resolved x-ray photographic measurements of the implosion of large aspect ratio (- 200) glass microballoons driven by symmetric nanosecond 1.05 pm radiation at moderate intensities (~ 1014 W cm-2) from the 24-beam OMEGA laser facility. Time-resolved x-ray photography was provided by a pinhole camera system having a magnification of - 13, coupled with a specially designed x-ray streak camera. The latter included a gold photocathode deposited on a Be substrate, had an electrooptic image magnification of ~2.2, and was of an all re-entrant design. The use of a fine scale accelerating mesh and an extraction field of ~ 10 kV cm 1 produced a spatial resolution 20 1pm across the 8 mm slit photocathode. Temporal resolution of the instrument with the present ~2 ns streak duration was ~ 20 ps. Since the imaging and electrooptic system was in close proximity to the hostile environment of the target with-in the target chamber, special precautions were required to preserve the integrity of the electrooptic system.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. C. Richardson, S. A. Letzring, W. Friedman, and G. Gregory "Time Resolved X-ray Photography of Uniformly Irradiated Spherical Targets", Proc. SPIE 0427, High Speed Photography, Videography, and Photonics I, (9 January 1984);


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