Advances in High Intensity e-Beam Diode Development for Flash X-Ray Radiography |
| B.V. Oliver, K. Hahn, M.D. Johnston and S. Portillo
Sandia National Laboratories, Albuquerque, New Mexico, USA |
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| Recent experiments at Sandia National Laboratories have demonstrated an electron beam diode X-ray source capable of producing >350 rad at one meter with 1.7 mm FWHM X-ray source distribution, with a 50 ns pulse width and X-ray photon endpoint energy spectrum in the 6-7 MeV range. The diode operates at current densities of ≈ 1 MA/cm2. The intense electron beam rapidly ( ≈ 5 ns) heats the X-ray conversion: anode/target, liberating material in the form: of low density ion emission early in the pulse and high density plasma later. This environment gives rise to beam/plasma collective effects which dominate the diode and beam characteristics, affecting the radiation properties (dose and spot size). A review of the diode operation, the measured source characteristics and the simulation methods and diagnostics used to guide its optimization is given. |
| DOI: 10.12693/APhysPolA.115.1044 PACS numbers: 41.75.Fr, 41.75.Ht, 41.50.+h, 52.59.Mv, 87.59.B- |