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Title: Enhanced traveling wave amplification of co-planar slow wave structure by extended phase-matching

The electron beam co-propagating with slow waves in a staggered double grating array (SDGA) efficiently amplifies millimeter and sub-millimeter waves over a wide spectrum. Our theoretical and numerical analyses show that the power amplification in the fundamental passband is enhanced by the extended beam-wave phase-matching. Particle-in-cell simulations on the SDGA slow wave structure, designed with 10.4 keV and 50–100 mA sheet beam, indicate that maintaining beam-wave synchronization along the entire length of the circuit improves the gain by 7.3% leading to a total gain of 28 dB, corresponding to 62 W saturated power at the middle of operating band, and a 3-dB bandwidth of 7 GHz with 10.5% at V-band (73.5 GHz center frequency) with saturated peak power reaching 80 W and 28 dB at 71 GHz. These results also show a reasonably good agreement with analytic calculations based on Pierce small signal gain theory.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Department of Physics, Northern Illinois University, Dekalb, Illinois 60115 (United States)
  2. Bridge 12 Technologies Inc., Framingham, Massachusetts 01702 (United States)
  3. (APC), Fermi National Accelerator Laboratory (FNAL), Batavia, Illinois 60510 (United States)
Publication Date:
OSTI Identifier:
22493771
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; ELECTRON BEAMS; GAIN; GHZ RANGE; GRATINGS; KEV RANGE; NUMERICAL ANALYSIS; PEAK LOAD; PHASE STABILITY; SIGNALS; SYNCHRONIZATION; TRAVELLING WAVES