Recent advances in high power microwave sources and the science of electronics in extreme electromagnetic environments at the university of new mexico

Schamiloglu, E.; Prasad, Sudhakar; Fuks, Mikhail; Yurt, Sabahattin C.; Elfrgani, Ahmed; Shipman, Kevin; Hemmady, Sameer; Zarkesh-Ha, Payman; Peng, Zhigang; Balakrishnan, Ganesh; Heileman, Gregory L.; Shao, Yang; Dietz, David

doi:10.1109/iceaa.2017.8065323

Cited by 1 publication

(1 citation statement)

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“…Different interaction circuits formed as MTMloaded waveguides have been designed and tested at low microwave power levels 10,16,17 . High power experiments of MTM sources with relativistic electron beams have been reported 5,6,18 .…”

Section: Introductionmentioning

confidence: 99%

Linear theory of instabilities generated by an electron beam in a metamaterial-loaded waveguide

Shapiro

Temkin

2019

Physics of Plasmas

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We present the linear theory of the starting current of Cherenkov-cyclotron and Cherenkov instabilities generated by an electron beam passing through a metamaterial-loaded waveguide. Effective medium theory is used to represent the metamaterial structure properties. The theory predicts that the instabilities compete, with the Cherenkov-cyclotron mode dominating at lower magnetic field and the Cherenkov instability at higher magnetic field. The theoretical results are compared to results from recent experiments at MIT using a 490 kV, 84 A electron beam in magnetic fields of 300 G to 1500 G. For an effective medium model fitted to the MIT experimental parameters, theory predicts that the Cherenkov-cyclotron mode will dominate below 780 G and the Cherenkov mode above 780 G, in good agreement with experimental observations of switching between these modes at 750 G. The analytical theory allows a better understanding of the mode competition and the dependence of the instabilities on key parameters such as voltage, current and magnetic field.

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