2003 Annual Report
The fiscal year ending September 2003 concluded the first year of the second five-year renewal of cooperative agreement DE-FC03-92SF19460 with the U.S. Department of Energy (DOE). This report summarizes research at the Laboratory for Laser Energetics (LLE) conducted during the year, the operation of the National Laser Users’ Facility (NLUF), the status of the new OMEGA Extended Performance (EP) laser project, and programs concerning the education of high school, undergraduate, and graduate students during the year.
The prime thrust of LLE’s ICF research is the validation of capsule designs that are hydrodynamically equivalent to the baseline cryogenic direct-drive-ignition design for the National Ignition Facility (NIF). In FY03, neutron yields were measured on OMEGA from cryogenic capsules, with high-adiabat drive pulses, that were close to those calculated by 1-D hydrocodes. Near-2-D hydrocode performance was measured on similar capsules with low-adiabat drive pulses. Improved direct-drive capsule performance was demonstrated using adiabat shaping with a high-intensity picket pulse in front of the main-drive pulse. The report also contains an account of the seminal work to experimentally validate the reduction in the Rayleigh–Taylor growth rate using a picket pulse in planar-target experiments. The results suggest that the acceleration-phase RT growth rates for short-wavelength, laser-induced imprint perturbations may be virtually eliminated by using such picket pulses. Other related work reported in this volume includes “polar direct drive (PDD)”a new topic of research this year–which examines the feasibility of using the x-ray-drive configuration at the NIF to achieve direct-drive ignition and work target fabrication, characterization, and experimental implementation of cryogenic targets on OMEGA. These results are all key to the early demonstration of ignition with cryogenic direct-drive capsules on the NIF.
Progress on the OMEGA EP project is also reported in this volume. Initial funding, NNSA approval of Mission Need, University of Rochester authorization of funding for the building construction, NNSA decision to proceed with the design and construction of the first two beams of the EP system, and start of building construction all occurred during FY03. OMEGA EP will couple short-pulse technology with the 60-beam compression facility by the end of FY07. This project will modernize OMEGA and significantly expand the range of high-energy-density (HED) physics experiments carried out during the second half of this decade and beyond.
In addition to accounts of the progress made in the Laboratory’s primary research and development areas, this report also includes a summary of experiments conducted on OMEGA by teams of scientists from other universities, private industry, and government laboratories including Lawrence Livermore National Laboratory (LLNL), Los Alamos National Laboratory (LANL), and Sandia National Laboratory (SNL), More than half of the total target shots on OMEGA during FY03 were dedicated to these external users.
Finally, the report includes a summary of the LLE education programs in FY02. LLE is the only major university participant in the National ICF Program, and education is an important mission of the Laboratory.
- Executive Summary
- Direct-Drive Cryogenic Target Implosion Performance on OMEGA
- Hydrodynamic Growth of Shell Modulations in the Deceleration Phase of Spherical Direct-Drive Implosions
- Improved Performance of Direct-Drive ICF Target Designs with Adiabat Shaping Using an Intensity Picket
- High-Conversion-Efficiency Optical Parametric Chirped-Pulse Amplification System Using Spatiotemporally Shaped Pump Pulses
- Ultrafast Superconducting Single-Photon Optical Detectors and Their Applications
- Very Fast Metal-Semiconductor-Metal Ultraviolet Photodiodes on GaN with Submicron Finger Width
- Glassy Liquid Crystals for Tunable Reflective Coloration
- High-Resolution Near-Field Raman Microscopy of Single-Walled Carbon Nanotubes
- Optimization of Deposition Uniformity for Large-Aperture NIF Substrates in a Planetary Rotation System
- Multibeam Effects on Fast-Electron Generation from Two-Plasmon-Decay Instability
- On the Bell-Plesset Effects: The Effects of Uniform Compression and Geometrical Convergence on the Classical Rayleigh-Taylor Instability
- Laser-Induced Adiabat Shaping by Relaxation in Inertial Confinement Fusion Implosions
- Demonstration of a Room-Temperature Single-Photon Source for Quantum Information: Single-Dye-Molecule Fluorescence in a Cholesteric Liquid Crystal Host
- EXAFS Measurements of Laser-Generated Shocks with an Imploded Target as a Radiation Source
- Modeling Temperature and Pressure Gradients During Cooling of Thin-Walled Cryogenic Targets
- Development of an Elementary Climate Model: Two-Layer Cellular Case
- Publications and Conference Presentations
- Reduction of the Ablative Rayleigh-Taylor Growth Rate with Gaussian Picket Pulses
- Theory of Laser-Induced Adiabat Shaping in Inertial Fusion Implosions: The Decaying Shock
- Design of a Highly Stable, High-Conversion-Efficiency, Optical Parametric Chirped-Pulse Amplification System with Good Beam Quality
- Nonlinear Propagation of Laser Beams near the Critical-Density Surface in the Plasmas of Direct-Drive Targets
- Time-Resolved Photoresponse in the Resistive Flux-Flow State in Y-Ba-Cu-O Superconducting Microbridges
- Ultrafast and Highly Sensitive Photodetectors Fabricated on High-Energy-Nitrogen-Implanted GaAs
- Tritiated Amorphous Silicon Betavoltaic Devices
- The Coherent Addition of Gratings for Pulse Compression in High-Energy Laser Systems
- Polar Direct Drive on the National Ignition Facility
- Properties of Fluid Deuterium Under Double-Shock Compression to Several Megabars
- Independent Phase and Amplitude Control of a Laser Beam Using a Single-Phase-Only Spatial Light Modulator
- Proton Temporal Diagnostic for ICF Experiments on OMEGA
- Polishing PMMA and Other Optical Polymers with Magnetorheological Finishing
- LLE’s Summer High School Research Program
- FY03 Laser Facility Report
- National Laser Users’ Facility and External Users’ Programs