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Your search keyword '"Kilkenny, J."' showing total 17 results
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17 results on '"Kilkenny, J."'

4. X-ray penumbral imaging diagnostic developments at the National Ignition Facility

Author

Koch, Jeffrey A., Grim, Gary P., Bachmann, B., Abu-Shawareb, H., Alexander, N., Ayers, J., Bailey, C. G., Bell, P., Benedetti, L. R., Bradley, D., Collins, G., Divol, L., Döppner, T., Felker, S., Field, J., Forsman, A., Galbraith, J. D., Hardy, C. M., Hilsabeck, T., Izumi, N., Jarrot, C., Kilkenny, J., Kramer, S., Landen, O. L., Ma, T., MacPhee, A., Masters, N., Nagel, S. R., Pak, A., Patel, P., Pickworth, L. A., Ralph, J. E., Reed, C., Rygg, J. R., and Thorn, D. B.

Published
2017
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7. M-ARIANE (Mirror-assisted Active Readout In A Neutron Environment): an x-ray imaging system for implosion experiments on the National Ignition Facility at ignition neutron yields

Author

Bell, Perry M., Grim, Gary P., Smalyuk, V. A., Ayers, J., Bell, P. M., Benedetti, L. R., Bradley, D. K., Cerjan, C., Emig, J., Felker, B., Glenn, S. M., Hagmann, C., Holder, J., Izumi, N., Kilkenny, J. D., Koch, J. A., Landen, O. L., Moody, J., Piston, K., Simanovskaia, N., and Walton, C.

Published
2013
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10. Efficiency and decay time measurement of phosphors for x-ray framing cameras usable in harsh radiation background

Author

Izumi, N., Emig, J., Moody, J., Middleton, C., Holder, J., Piston, K., Smalyuk, V., Hagmann, C., Ayers, J., Celeste, J., Cerjan, C., Felker, B., Sorce, C., Krauter, K., Glenn, S., Bourgade, J.-L., Kilkenny, J. D., Bradley, D. K., and Bell, P. M.

Abstract

Phosphors are key components of x-ray framing cameras. On implosion experiments at the National Ignition Facility, the x-ray framing cameras must operate in a harsh neutron induced ionizing radiation. One promising approach of neutron induced background reduction is separation of the neutron background with using difference of x-ray and neutron time-of- flight. To complete x-ray imaging before arrival of the neutron induced radiation to the detector, it is crucial to find a phosphor which has high efficiency and fast decay time. We tested various phosphor materials to optimize design of framing cameras for implosion experiments.

Published
2011
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11. X-ray imaging in an environment with high-neutron background on National Ignition Facility

Author

Smalyuk, V. A., Ayers, J., Bell, P. M., Bourgade, J.-L., Bradley, D. K., Celeste, J., Cerjan, C., Darbon, S., Emig, J., Felker, B., Hagmann, C., Holder, J., Izumi, N., Kilkenny, J. D., Moody, J., Piston, K., Rousseau, A., Sorce, C., and Tommasini, R.

Abstract

X-ray imaging instruments will operate in a harsh ionizing radiation background environment on implosion experiments at the National Ignition Facility. These backgrounds consist of mostly neutrons and gamma rays produced by inelastic scattering of neutrons. Imaging systems based on x-ray framing cameras with film and CCD's have been designed to operate in such harsh neutron-induced background environments. Some imaging components were placed inside a shielded enclosure that reduced exposures to neutrons and gamma rays. Modeling of the signal and noise of the x-ray imaging system is presented.

Published
2011
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14. On the design of the NIF Continuum Spectrometer

Author

Koch, Jeffrey A., Grim, Gary P., Thorn, D. B., MacPhee, A., Ayers, J., Galbraith, J., Hardy, C. M., Izumi, N., Bradley, D. K., Pickworth, L. A., Bachmann, B., Kozioziemski, B., Landen, O., Clark, D., Schneider, M. B., Hill, K. W., Bitter, M., Nagel, S., Bell, P. M., Person, S., Khater, H. Y., Smith, C., and Kilkenny, J.

Published
2017
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15. Demonstration of enhanced DQE with a dual MCP configuration

Author

Bell, Perry M., Grim, Gary P., Izumi, N., Hall, G. N., Carpenter, A. C., Allen, F. V., Cruz, J. G., Felker, B., Hargrove, D., Holder, J., Kilkenny, J. D., Lumbard, A., Montesanti, R., Palmer, N. E., Piston, K., Stone, G., Thao, M., Vern, R., Zacharias, R., Landen, O. L., Tommasini, R., Bradley, D. K., and Bell, P. M.

Published
2014
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16. Radiation induced noise in x-ray imagers for high-yield inertial confinement fusion experiments

Author

Hagmann, C., Ayers, J., Bell, P. M., Bourgade, J.-L., Bradley, D. K., Celeste, J., Cerjan, C., Darbon, S., Emig, J., Felker, B., Glenn, S., Holder, J., Izumi, N., Kilkenny, J. D., Moody, J., Piston, K., Rousseau, A., Smalyuk, V. A., and Sorce, C.

Abstract

The large fluence of 14-MeV neutrons produced in high-yield inertial confinement fusion (ICF) experiments creates a variety of backgrounds in x-ray imagers viewing the implosion. Secondary charged particles produce background light by Cherenkov emission, phosphor screen excitation and possibly scintillation in the optical components of the imager. In addition, radiation induced optical absorption may lead to attenuation of the signal. Noise is also produced directly in the image recorder itself (CCD or film) via energy deposition by electrons and heavy charged particles such as protons and alphas. We will present results from CCD background measurements and compare them to Monte Carlo calculations. In addition we show measurements of luminescence and long-term darkening for some of the glasses employed in imagers.

Published
2011
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17. Advanced gated x-ray imagers for experiments at the National Ignition Facility

Author

Glenn, S., Bell, P. M., Benedetti, L. R., Bradley, D. K., Celeste, J., Heeter, R., Hagmann, C., Holder, J., Izumi, N., Kilkenny, J. D., Kimbrough, J., Kyrala, G. A., Simanovskaia, N., and Tommasini, R.

Abstract

X-ray imaging is integral to the measurement of the properties of hot plasmas. To this end, a suite of gated x-ray imagers have been developed for use in a wide range of experiments at the National Ignition Facility (NIF). These instruments are sensitive to x-rays over the range of 0.7-90keV and can acquire images at 20ps intervals for source intensities ranging over several orders of magnitude. We review the design, technology, and construction of these instruments and present recent results obtained from NIF experiments in which gated x-ray imagers have played a key role. The radiation environment associated with Inertial Confinement Fusion (ICF) experiments presents unique challenges for x-ray imaging. We report on the performance of gated imagers that have been optimized for this harsh environment and describe diagnostics to be deployed in the near future that will provide x-ray images of imploding ICF capsules in the presence of backgrounds associated with neutron yields above 1016. Such images will provide crucial data that will enable even higher neutron yields and successful ignition.

Published
2011
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