Development of a High Brightness Source for Fast Neutron Imaging*
| Autor: | Rusnak, Brian, Anderson, Scott, Bleuel, Darren, Crank, Matthew, Fitsos, Pete, Gibson, David, Hall, James, Johnson, Micah, Marsh, Roark, Sain, John, Souza, Ray, Wiedrick, Anthony |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| DOI: | 10.18429/jacow-napac2016-thb3io01 |
| Popis: | Lawrence Livermore National Lab is developing an intense, high-brightness fast neutron source to create high resolution neutron radiographs and images. An intense source (10¹¹ n/s/sr at 0 degrees) of fast neutrons (10 MeV) allows: penetrating very thick, dense objects; maintaining high scintillator response efficiency; and remaining below the air activation threshold for (n,p) reactions. Fast neutrons will be produced using a pulsed 7 MeV, 300 microamp average-current commercial ion accelerator that will deliver deuterons to a 3 atmosphere deuterium gas cell. To achieve high resolution, a small (1.5 mm diameter) beam spot size will be used, and to reduce scattering from lower energy neutrons, a transmission gas cell will be used to produce a quasi-monoenergetic neutron beam. Because of the high power density of such a tightly focused, modest-energy ion beam, the gas target is a major engineering challenge that combines a 'windowless' rotating aperture, a rotary valve to meter cross-flowing high pressure gases, a novel gas beam stop, and recirculating gas compressor systems. A summary of the progress of the system design and building effort shall be presented. Proceedings of the North American Particle Accelerator Conf., NAPAC2016, Chicago, IL, USA |
| Databáze: | OpenAIRE |
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