These results, along with many other confirmatory ones from other sub-ps glass lasers, were explained on the basis of the Target-Normal Sheath Acceleration (TNSA) mechanism. where ∼10% of the laser energy was transferred to the beam with proton energies up to 58 MeV. obtained by irradiating ∼ μm-thick foils with intense (>10 20 W/cm 2) ∼0.5 ps laser pulses at the Nova PW laser, 2 2.
Intense high-energy proton beams from Petawatt-laser irradiation of solids,” Phys. Research on intense ion-beam generation got a significant impetus as a result of groundbreaking results on proton acceleration 1 1. The plans and prospects for further improvements and applications are also discussed. Neutron spectral control by means of a flexible converter-disk design has been demonstrated, and the neutron beam has been used for point-projection imaging of thick objects. In addition, prior work on the intense neutron beam driven by an intense deuterium beam generated in the RIT regime has been extended. These beam plasmas have been directed also at a thick Ta disk to generate a directed, intense point-like Bremsstrahlung source of photons peaked at ∼2 MeV and used it for point projection radiography of thick high density objects. These ion beams with co-propagating electrons have been used on Trident for uniform volumetric isochoric heating to generate and study warm-dense matter at high densities. The experimental demonstration has been done with 0.12 PW, high-contrast, 0.6 ps Gaussian 1.053 μm laser pulses irradiating planar foils up to 250 nm thick at 2–8 × 10 20 W/cm 2.
Thus, ion beams with narrow energy peaks at up to 18 MeV/nucleon are generated reproducibly with high efficiency (≈5%). After the laser exits the plasma, this electric field acts on a highly structured ion-beam distribution in phase space to reduce the energy spread, thus separating acceleration and energy-spread reduction. These magnetic fields trap the laser-heated multi-MeV electrons, which generate a high localized electrostatic field (∼0.1 T V/m). This mode involves self-generation of persistent high magnetic fields (∼10 4 T, according to particle-in-cell simulations of the experiments) at the rear-side of the plasma. This mode yields an ion beam with much narrower energy spread while maintaining high ion energy and conversion efficiency. By further optimization of the laser and target, the RIT regime has been extended into a self-organized plasma mode. Although a majority of the files consist of between two to four pages, a few contain up to four linear inches of material.Laser-plasma interactions in the novel regime of relativistically induced transparency (RIT) have been harnessed to generate intense ion beams efficiently with average energies exceeding 10 MeV/nucleon (>100 MeV for protons) at “table-top” scales in experiments at the LANL Trident Laser. Materials continue to be added to these files.
Additional material consists of newspaper clippings, journal articles, change of command/retirement brochures, and biographies printed from the websites of the Navy Chief of Information and Arlington National Cemetery. Many of the files consist of individual officer biographies produced during the 1950s through the 1970s by the Navy Office of Information, Internal Relations Division the Navy Office of Information, Biographies Branch and the Division of Naval Records and History (OP 29). Also see Navy Personnel: A Research Guide. For biographical information from the late 18th through the early 20th centuries, see the Navy Department Library's ZB files and Officers of the Continental and U.S. Navy officers who served during the Second World War and the Cold War-era, though their contents range from the Interwar period (1919-1939) through the War on Terrorism. The files are particularly noted for biographical coverage of senior U.S. These files have been accumulated since the early 20th century by the Navy Department Library to provide historical information to US Navy personnel and other researchers, both official and unofficial. They are a combination of files collected by the Library and a ready reference collection of duplicate flag officer files formerly housed in the Archives Branch of the Naval History and Heritage Command. The Modern Biographical Files are located in the Navy Department Library's Rare Book Room.
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