94-GHz 25-kW CW low-voltage harmonic gyrotron |
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Authors: | McDermott DB Statzman RC Balkcum AJ Luhmann NC |
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Institution: | Dept. of Appl. Sci., California Univ., Irvine, CA ; |
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Abstract: | A low-voltage second-harmonic gyrotron intended as a compact lightweight source has been designed and evaluated with a particle-tracing code and the particle-in-cell code MAGIC. The two codes are shown to be in good agreement when applied to a conventional fundamental-frequency gyrotron and also to the novel second-harmonic gyrotron. The 25-kW continuous wave (CW) 94-GHz gyrotron with a predicted conversion efficiency of 32% and device efficiency of 22.5% is driven by a 25-kV 4.5-A (υ⊥/υ2=1.5, Δυz/υz=7%) electron beam from a magnetron injection gun and employs a low-loss TE021/TE031 complex cavity for mode control. Although the 17-kG CW gyrotron will use a cryogen-free high-Tc superconducting magnet, a 94-GHz prototype will be tested at low duty with a conventional low-Tc superconducting magnet |
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