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Projection ablation lithography cathode for high-current, relativistic magnetron

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8 Author(s)
Jones, M.C. ; Nuclear Engineering and Radiological Sciences Department, Intense Energy Beam Interaction Lab, University of Michigan, Ann Arbor, Michigan 48109-2104 ; Neculaes, V.B. ; Gilgenbach, R.M. ; White, W.M.
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Initial results are presented of an innovative cathode operating in a relativistic magnetron powered by an accelerator with parameters: -0.3 MV, 1–10 kA, and 0.5 μs pulse length. This cathode is fabricated by ablating a pattern on the cathode using a KrF laser. This projection ablation lithography (PAL) cathode has demonstrated fast current turn-on and microwave startup times have decreased from an average of 193 to 118 ns. The pulselength of 1 GHz microwave oscillation has increased from a 144 ns average to 217 ns. With these improvements in microwave startup and pulse length, the microwave power has approximately remained the same compared to the previously used cloth cathodes. A new triple-azimuthal emission region is tested as means of prebunching the electrons (“cathode priming”) into the three spokes desired for pi mode operation in a six-cavity magnetron. The Tri-PAL cathode priming results in the fastest startup and highest efficiency of relativistic magnetron microwave generation.

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Review of Scientific Instruments  (Volume:75 ,  Issue: 9 )