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DIRECTED ENERGY PROFESSIONAL SOCIETY

Abstract: 25-Symp-069

UNCLASSIFIED, PUBLIC RELEASE

Progress on the Design of an X-Band Multi-Stream Traveling Wave Tube Amplifier

The University of New Mexico (UNM) has been collaborating with the University of California, Irvine (UCI) on the design of an X-band multi-stream TWT. This effort builds on the work of Figotin at UCI [1], the work of Islam et al. at UNM [2,3], and the collaborative work of Schamiloglu and Figotin [4]. The design of an X-band multi-stream TWT is motivated by the suggestion that the growth of the amplified signal will be super-exponential, i.e., faster than simply exp (αz) [1]. In addition, in [4], we derived formulas for the first time that reveal the low-and high-frequency cutoffs for amplification in a TWT. Successful design of a multi-stream TWT includes the design of the electromagnetic interaction structure (circuit), the input coupler and mode converter, and the extraction region for the given electron beam and guide magnetic field parameters. This presentation will review progress on this effort to-date.

This work is supported by AFOSR MURI Grant FA9550-20-1-0409

1. A. Figotin, An Analytic Theory of Multi-stream Electron Beams in Traveling Wave Tubes (World Scientific Publishing Company, Singapore, 2020).
2. K.N. Islam and E. Schamiloglu, “Multiple Electron Beam Generation with Different Energies and Comparable Currents from a Single Cathode Potential for High Power Traveling Wave Tubes (TWTs),” J. Appl. Phys., vol. 131, 044901-1-15 (2022).
3. K.N. Islam, L.D. Ludeking, A.D. Andreev, S. Portillo, A.M. Elfrgani, and E. Schamiloglu, “Modeling and Simulation of Relativistic Multiple Electron Beam Generation with Different Energy from a Single Cathode Potential for High Power Microwave Sources,” IEEE Trans. Electron Dev., vol. 69, 1380-1388 (2022).
4. E. Schamiloglu and A. Figotin, The Field Theory of Collective Cherenkov Radiation Associated with Electron Beams,” Phys. Plasmas, vol. 31, 023101 (2024).

UNCLASSIFIED, PUBLIC RELEASE