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Monte Carlo validation experiments for the gas Cherenkov detectors at the National Ignition Facility and Omega
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10.1063/1.4812572
/content/aip/journal/rsi/84/7/10.1063/1.4812572
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/7/10.1063/1.4812572
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Not-to-scale schematic of the Gamma Reaction History (GRH) diagnostic fielded at NIF and Omega.

Image of FIG. 2.
FIG. 2.

Not-to-scale schematic of the Gas Cherenkov Detector (GCD) fielded at Omega.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Plot of the refractive index of CO and SF at standard temperature and pressure. The Sellmeir fit for SF was formed using a least-squares approximation to three separate experimental datasets.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

Plot showing the PMT110-001 quantum efficiency folded with the general 1/λ 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.

Image of FIG. 7.
FIG. 7.

Plot showing a comparison between experiment and GRH simulation for a 4.4 MeV γ beam and a range of SF gas-cell pressures.

Image of FIG. 8.
FIG. 8.

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 SF and 200 psi, respectively.

Image of FIG. 9.
FIG. 9.

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 CO and 65 psi, respectively.

Image of FIG. 10.
FIG. 10.

Plot showing the intensity recorded by GCD during a 16.86 MeV HIγS pressure scan measurement compared with simulation between 10 and 100 psi.

Image of FIG. 11.
FIG. 11.

Plot showing a comparison between the GCD and data obtained during the 2001 Idaho LINAC experiment. 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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/content/aip/journal/rsi/84/7/10.1063/1.4812572
2013-07-12
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Monte Carlo validation experiments for the gas Cherenkov detectors at the National Ignition Facility and Omega
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/7/10.1063/1.4812572
10.1063/1.4812572
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