T. N. Archuleta

Relative sensitivity of plastic scintillator: A comparative analysis with 60Co gamma rays, deuterium–deuterium, and deuterium–tritium neutrons

Y. Kim, K. D. Meaney, R. J. Leeper, S. H. Batha et autres

A plastic scintillator has found extensive application in the realm of high-energy physics and national security science. Many applications in those fields often involve the simultaneous production of photons, neutrons, and charged particles, which makes the relative sensitivity information for these different …

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Short-pulse photoneutron production on beryllium using the mercury pulsed power X-ray source

Dana Duke, T. N. Archuleta, M. Boswell, Michelle Espy et autres

An x-ray beam can produce neutrons using beryllium as a photoneutron converter because of the relatively low 9Be(ɤ,n) reaction energy threshold. Previous photoneutron production simulations have focused on using a linear accelerator and heavy water to generate photoneutrons for potential medical therapies. …

Iron X-ray Transmission at Temperature Near 150 eV Using the National Ignition Facility: First Measurements and Paths to Uncertainty Reduction

R. F. Heeter, T. S. Perry, Heather Johns, Kathy Opachich et autres

Discrepancies exist between theoretical and experimental opacity data for iron, at temperatures 180–195 eV and electron densities near 3 × 1022/cm3, relevant to the solar radiative-convective boundary. Another discrepancy, between theory and helioseismic measurements of the boundary’s location, would be ameliorated if …

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Implementation of a 1-2 keV point-projection x-ray spectrometer on the National Ignition Facility

J. A. King, Y. P. Opachich, Eric Huffman, Russell Knight et autres

A point-projection soft X-ray Opacity Spectrometer (OpSpec) has been implemented to measure X-ray spectra from ∼1 to 2 keV on the National Ignition Facility (NIF). Measurement of such soft X-rays with open-aperture point-projection detectors is challenging because only very thin filters may …

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Update on the Iron Opacity Experiments on the NIF

T. S. Perry, R. F. Heeter, Y. P. Opachich, J. A. King et autres

Recent iron opacity experiments on the Sandia National Laboratories Z machine have reported up to factors of two discrepancies between theoretical and experimental results. Much effort has been invested in identifying experimental errors as well as revisiting opacity theories, but a resolution …

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Effect of emission models on particle-in-cell simulations of a large-area bremsstrahlung diode operating at 5 MV with comparison to experimentally measured dose

A. S. Richardson, J. C. Zier, S. L. Jackson, J. W. Schumer et autres

Recent experiments on the Mercury pulsed power accelerator were performed with a large-area bremsstrahlung diode operated at 5 MV. Extensive measurements of the x-ray dose distribution were made using TLDs, both in the near field and far field of the x-ray beam. …

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Replicating the Z iron opacity experiments on the NIF

T. S. Perry, R. F. Heeter, Y. P. Opachich, P. W. Ross et autres

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Design And First Use of the NIF Opacity Spectrometer

J. A. King, P. W. Ross, Eric Huffman, Y. P. Opachich et autres

Gamma Ray Measurements at OMEGA with the Newest Gas Cherenkov Detector “GCD-3”

A. M. McEvoy, H. W. Herrmann, Y Kim, A. B. Zylstra et autres

Initial results from the newest Gas Cherenkov Detector (GCD-3) are reported demonstrating improved performance over previous GCD iterations. Increased shielding and lengthening of the Cherenkov photon optical path have resulted in a diminished precursor signal with increased temporal separation between the precursor …

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A novel solution to the gated x-ray detector gain droop problem

J. A. Oertel, T. N. Archuleta

Microchannel plate (MCP), microstrip transmission line based, gated x-ray detectors used at the premier ICF laser facilities have a drop in gain as a function of mircostrip length that can be greater than 50% over 40 mm. These losses are due to …

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Search for reaction-in-flight neutrons using thulium activation at the National Ignition Facility

G. P. Grim, R. S. Rundberg, A. P. Tonchev, M. M. Fowler et autres

The 27.3 meter neutron time-of-flight system for the National Ignition Facility

G. P. Grim, G. L. Morgan, Robert Aragonez, T. N. Archuleta et autres

One of the scientific goals of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, Livermore CA, is to obtain thermonuclear ignition by compressing 2.2 mm diameter capsules filed with deuterium and tritium to densities approaching 1000 g/cm3 and temperatures in …

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