Not-to-scale schematic of the Gamma Reaction History (GRH) diagnostic fielded at NIF and Omega.
Not-to-scale schematic of the Gas Cherenkov Detector (GCD) fielded at Omega.
Plot showing density scaling with respect to gas pressure. Density values were interpolated for a temperature of 293.71 K, the NIF target hall nominal temperature. The pressure versus density scaling polynomials for GCD were interpolated for a GCD gas-cell temperature of 298 K measured at the Omega laser facility.
Plot of the refractive index of CO2 and SF6 at standard temperature and pressure. The Sellmeir fit for SF6 was formed using a least-squares approximation to three separate experimental datasets.
Plot showing the transmission and reflection spectra used in the GEANT4 models of GRH and GCD. Dotted lines represent pressure window transmissions and solid lines mirror reflectances.
Plot showing the PMT110-001 quantum efficiency folded with the general 1/λ2 Cherenkov emission spectrum. Comparing the area before and after folding yields a Cherenkov distribution-weighted QE of 17.5%. The QE data provided by Photek Ltd. were interpolated to a regular abscissa before folding.
Plot showing a comparison between experiment and GRH simulation for a 4.4 MeV γ beam and a range of SF6 gas-cell pressures.
Plot comparing the results of translating the HIγS beam across the GRH diagnostic with simulations. The beam energy was 4.4 MeV, and the gas and pressure were SF6 and 200 psi, respectively.
Plot showing the translation of the HIγS beam across the GRH diagnostic compared with simulations. The beam energy was 16.86 MeV, and the gas and pressure were CO2 and 65 psi, respectively.
Plot showing the intensity recorded by GCD during a 16.86 MeV HIγS pressure scan measurement compared with simulation between 10 and 100 psi.
Plot showing a comparison between the GCD and data obtained during the 2001 Idaho LINAC experiment. 2 The electron source energy was varied between 8 and 18 MeV whilst holding the gas-cell pressure constant at 30 psi.
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