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Smirnova, E. I.

Paper Title Page
WEPMS030 Design and Initial Testing of Omniguide Traveling-wave Tube Structures 2403
  • E. I. Smirnova, B. E. Carlsten, L. M. Earley, W. B. Haynes
    LANL, Los Alamos, New Mexico
  Funding: This work was funded in part by the LDRD Director's Postdoctoral Fellowship, Los Alamos National Laboratory.

We propose to use the photonic band gap (PBG) structures for the construction of a traveling-wave tube (TWT) at W-band. Interest in millimeter-waves has increased in recent years due to applications in environmental monitoring and remote sensing. The development of wide-band mm-wave TWT amplifiers is underway at Los Alamos National Laboratory. A TWT would present a wide bandwidth source for remote mm-wave spectroscopy. PBG TWT structures have great potential for very large bandwidth and linear dispersion. In addition, being cheap to fabricate, the PBG structures enhance the commercial transferability of the W-band TWT technology. We employ an omniguide which is a one-dimensional version of the PBG structure representing a periodic system of concentric dielectric tubes as a slow-wave structure. A silica omniguide was designed to support a TM01-like mode with a phase velocity matching the one of a 120keV electron beam. The structure was fabricated, cold-tested and installed at our laboratory for the hot test.

THPMS005 Observation of Wakefields in a 17 GHz Metallic Photonic Bandgap (PBG) Structure 3002
  • R. A. Marsh, M. A. Shapiro, R. J. Temkin
    MIT/PSFC, Cambridge, Massachusetts
  • E. I. Smirnova
    LANL, Los Alamos, New Mexico
  Funding: Work supported by the Department of Energy, High Energy Physics, under contract DE-FG02-91ER40648.

Results are reported on experimental wakefield measurements made on a 6 cell, 17 GHz metallic PBG accelerator structure. Wakefields were observed using a variety of detectors and methods. The PBG structure is open, containing no outer wall, and radiation has been observed through a window in the surrounding vacuum vessel. The input and output ports have also been used with windows to observe radiation coupling out of the ports. Estimations of radiation are made using HFSS and an EFIE code. Measurements have been made using video diode detectors, wavemeters, heterodyne receivers, and a bolometer. Plans are discussed for future experiments with injected power and longer structures.