13 research outputs found
Direct observation of density gradients in ICF capsule implosions via streaked Refraction Enhanced Radiography (RER)
Neuropsychiatric Disturbances in a Patient with a Nonmosaic Isodicentric (X) (q21.32) Chromosome
Hard X-ray and hot electron environment in vacuum hohlraums at NIF
Time resolved hard x-ray images (hv 9 keV) and time
integrated hard x-ray spectra (hv 18-150 keV) from vacuum hohlraums
irradiated with four 351 nm wavelength NIF laser beams are presented as a
function of hohlraum size and laser power and duration. The hard x-ray
images and spectra provide insight into the time evolution of the hohlraum
plasma filling and the production of hot electrons. The fraction of laser
energy detected as hot electrons (f shows correlation with both
laser intensity and with an analytic plasma filling model
Application of proton radiography in experiments of relevance to inertial confinement fusion
Multi-Mev proton beams generated by target normal sheath acceleration (TNSA) during the interaction of an ultra intense laser beam (Ia parts per thousand yen10(19) W/cm(2)) with a thin metallic foil (thickness of the order of a few tens of microns) are particularly suited as a particle probe for laser plasma experiments. The proton imaging technique employs a laser-driven proton beam in a point-projection imaging scheme as a diagnostic tool for the detection of electric fields in such experiments. The proton probing technique has been applied in experiments of relevance to inertial confinement fusion (ICF) such as laser heated gasbags and laser-hohlraum experiments. The data provides direct information on the onset of laser beam filamentation and on the plasma expansion in the hohlraum's interior, and confirms the suitability and usefulness of this technique as an ICF diagnostic
RDCI, the vasoactive intestinal peptide receptor: a candidate gene for the features of Albright hereditary osteodystrophy associated with deletion of 2q37.
Syndecan-1 and angiogenic cytokines in multiple myeloma: correlation with bone marrow angiogenesis and survival
Symmetry tuning with megajoule laser pulses at the National Ignition Facility
Experiments conducted at the National Ignition Facility using shaped laser pulses with more than 1 MJ of energy have demonstrated the ability to control the implosion symmetry under ignition conditions. To achieve thermonuclear ignition, the low mode asymmetries must be small to minimize the size of the hotspot. The symmetry tuning experiments use symmetry capsules, “symcaps”, which replace the DT fuel with an equivalent mass of CH to emulate the hydrodynamic behavior of an ignition capsule. The x-ray self-emission signature from gas inside the capsule during the peak compression correlates with the surrounding hotspot shape. By tuning the shape of the self-emission, the capsule implosion symmetry can be made to be “round.” In the experimental results presented here, we utilized crossbeam energy transfer [S. H. Glenzer, et al., Science 327, 1228 (2010)] to change the ratio of the inner to outer cone power inside the hohlraum targets on the NIF. Variations in the ratio of the inner cone to outer cone power affect the radiation pattern incident on the capsule modifying the implosion symmetry