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An astrophysically relevant experiment is compared to the output of a multidimensional radiation transfer code in which populations and radiation are self-consistently treated. Experimental Al Ly α spectra obtained with a very high-resolution spectrometer are presented as quantitative evidence of dot plasma non-planar expansion. Analysis of these spectra using the code is performed, in particular...
We discuss the preliminary estimates to create Neutron Star atmospheric conditions in the laboratory and the possibility of generating photon bubbles. The minimal requirements for photonbubble instability could potentially be met with a properly configured 10 ps petawatt laser experiment. The high energy (multi-MeV) electrons generated by an ultra-intense laser interacting with a foil are coupled...
Characterizing and optimizing hot electrons accelerated by short pulse lasers is of great interest, especially for Fast Ignition (FI) research. To date, most research on electron source and transport has been done using lasers with intrinsic prepulses. However, even a relatively low amount of prepulse (1–10 mJ in 3 ns) creates an underdense plasma that causes instabilities such as filamentation and...
Summary form only given. We report on recent experimental studies on the variations in proton conversion efficiency as a function of target thickness, molecular composition and laser pulse length. Experiments were carried out on the Titan laser at LLNL at laser intensities (1018-1020) and pulse lengths (0.7-5 ps). Erbium hydride was added to the rear surface of the target to study the effect of the...
Laser facilities for fast ignition will require in excess of 50 kJ of short pulse laser energy. Based on the current contrast estimate for the NIF ARC laser system at LLNL, ignition scale systems will have pre-pulses at the ~J level. This will produce a large scale-length plasma inside the reentrant fast ignition cone that could significantly influence the generation and transport of hot electrons...
We report the simultaneous, single shot, time-resolved measurements of self-emission and free expansion of aluminum isochorically heated by laser generated MeV protons. In this way we measure the equation of state along an isochore.
This preliminary study was conducted to explore different analytical shape methods for use in evaluating children born with cranial vault deformities. Twenty skull outlines from patients with metopic craniosynostosis were ascribed landmarks. Scale, location, and rotational factors were removed using Procrustes analysis. A single index of severity from 0-5, with 5 being the most severe, was developed...
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
The Titan laser, designed to produce up to 600 J with pulses of 0.4-200 ps, has begun initial target shots. Coupled with a kJ long-pulse beam, Titan will support high-energy-density physics research at LLNL.
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...
For children with cleft palate, oral function is impaired. The hypothesis is that the stress and strain distribution within the affected maxilla with a cleft during functional tasks such as biting and chewing is abnormal and can significantly affect bone development in the growing child. To test this hypothesis, a three-dimensional finite element model of a pediatric subject-specific maxilla with...
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