Abstract
High-convergence polar-drive experiments are being conducted on OMEGA (T. R. Boehly et al., Opt. Commum. 133, 495 (1997)) using triple-picket laser pulses. The goal of OMEGA experiments is to validate modeling of oblique laser deposition, heat conduction in the presence of nonradial thermal gradients in the corona, and implosion energetics in the presence of laser-plasma interactions such as crossed-beam energy transfer. Simulated shock velocities near the equator, where the beams are obliquely incident, are within 5% of experimentally inferred values in warm plastic shells, well within the required accuracy for ignition. High, near-one-dimensional areal density is obtained in warm-plastic-shell implosions. Simulated backlit images of the compressing core are in good agreement with measured images. Outstanding questions that will be addressed in the future relate to the role of cross-beam transfer in polar drive irradiation and increasing the energy coupled into the target by decreasing beam obliquity.
Highlights
Polar drive (PD) [1, 2] enables one to conduct direct-drive experiments while the National Ignition Facility (NIF [3]) is in the x-ray–drive configuration
High-convergence polar-drive experiments are being conducted on OMEGA [T
Outstanding questions that will be addressed in the future relate to the role of cross-beam transfer in polar drive irradiation and increasing the energy coupled into the target by decreasing beam obliquity
Summary
Polar drive (PD) [1, 2] enables one to conduct direct-drive experiments while the National Ignition Facility (NIF [3]) is in the x-ray–drive configuration. The goal of OMEGA experiments is to validate modeling of oblique laser deposition, heat conduction in the presence of nonradial thermal gradients in the corona, and implosion energetics in the presence of laser–plasma interactions such as crossed-beam energy transfer. Simulated shock velocities near the equator, where the beams are obliquely incident, are within 5% of experimentally inferred values in warm plastic shells, well within the required accuracy for ignition.
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