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- W2040891868 abstract "The indirect-drive National Ignition Campaign (NIC) proposes to set the first 2ns of hohlraum radiation symmetry by observing the instantaneous soft x-ray re-emission pattern from a high-Z sphere in place of the ignition capsule. To assess this technique under NIC conditions, we used the Omega Laser Facility to image the re-emission of Bi coated spheres with 200ps temporal, 50–100μm spatial, and 30% spectral resolution. The sphere is driven by 70% NIC-scale vacuum Au hohlraums heated to Tr=100eV using two cones per side laser beam illumination. The experiments have demonstrated the required accuracies of <3%P2∕P0 and <3%P4∕P0 Legendre mode flux asymmetry at both 900 and 1200eV re-emission photon energies. The re-emission patterns at 900 and 1200eV are also consistent with each other and their relative dependence on radiation temperature. We measured the P2∕P0 and P4∕P0 dependence to laser cone power ratio. View factor calculations are in agreement with the experimentally measured radiation flux and re-emit images when assuming 55% inner beam and 100 % outer beam coupling into x rays at the hohlraum wall." @default.
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- W2040891868 date "2008-10-01" @default.
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- W2040891868 title "NIF-scale re-emission sphere measurements of early-time Tr=100eV hohlraum symmetry (invited)" @default.
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- W2040891868 doi "https://doi.org/10.1063/1.2970041" @default.
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