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Peak core temperature is an important measure of implosion performance, and will be a critical diagnostic of ignition implosion performance at the National Ignition Facility because peak temperatures must attain high values in order to form the hot-spot spark that ignites the main mass of deuterium-tritium fuel. We plan to measure peak core temperatures, resolved in space and time, using a gated pinhole...
Imaging plate (IP) is a phosphor which has image storage capability. Because of its immunity to electric-magnetic-interference, IP's have been used in various laser-plasma experiments as a detector for X-ray imaging and electron spectroscopy. IP's are sensitive to most of ionizing radiations. Response of IP's to X-ray, gamma-ray, and charged particle exposure has been reported. However its intrinsic...
Summary form only given. The production of MeV protons by intense lasers is an area of great topical interest particularly with respect to the proposal to use protons to initiate burn in a fusion capsule. Following successful initial studies of focusing protons with hemishell targets, using a 10 J, 100 fs laser we extended the study to higher energy and longer pulses using PW class lasers at the RAL...
Summary form only given. Planned cryogenic ignition experiments at the National Ignition Facility (NIF) are expected to use a fill tube to introduce liquid DT into the capsule prior to solid layer formation. During the implosion, this fill tube is expected to form a hydrodynamic jet at deceleration that could quench ignition if this jet is sufficiently large and penetrates the core early enough. We...
Summary form only given. Synthetic polycrystalline diamonds produced by chemical vapor deposition (CVD) are the leading candidates for neutron time-of-flight detectors at the National Ignition Facility (NIF). The detectors based on CVD diamonds are fast and radiation hard. In the last year, significant progress was made on the 60-beam OMEGA laser system in the development of CVD diamond detectors...
Summary form only given. Results from the first NIF indirect-drive ICF experiments and Omega experiments testing new hohlraum and capsule designs are described. In the area of laser-hohlraum coupling, the effects of laser beam smoothing by spectral dispersion (SSD) and polarization smoothing (PS) on the beam propagation in long scale gas-filled targets has been studied at NIF at plasma scales relevant...
Summary form only given. Recent spectroscopic analysis, based on image intensity distributions and line spectra of a series of indirect-drive inertial confinement fusion implosions at the University of Rochester's OMEGA laser, has demonstrated a discrepancy between density gradients inferred from the data analysis and those calculated in "clean" hydrodynamic simulations. The cause of this...
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