8 September 1995 Mode competition in a high-current high-voltage Gyro-BWO experiment
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Abstract
The Air Force Phillips Laboratory Gyro-BWO experiment is utilizing the RAMBO pulser, with electron beam parameters of: VD equals 300-800 kV; ID equals 1-50 kA; pulselength equals 1-3 microsecond(s) . An annular electron beam of approximately 1-3 kA is produced by an annular aluminum cathode. The interaction cavity is designed to radiate in the frequency range of 4.2-5.5 GHz in a TE01 mode. The interaction cavity has a radius of 4.37 cm and a length of 15 cm. A diode magnetic field is used for a field immersed diode, and is tunable from 0-2 kG. The interaction region magnetic field is tunable from 2-7 kG. The diode and interaction magnetic fields are used together to provide a magnetic compression of the electron beam. C-band bevel-cut antennas located at the diode end of the experiment are used to extract the backward wave. Experiments have given microwave output pulselengths of 40-500 ns, on a voltage pulselength of 200-1400 ns. Extracted power range from 0.1 to 4 MW, and is voltage dependent. Nearly constant rf power can be extracted from 4.2-5.0 GHz in small passband filters. Breakdown of the air in the C-band waveguide has been observed during operation in the TE21 mode. Evidence of mode competition exists in the form of two different frequency values appearing at the same time. A (lambda) /4 slotted cavity has been designed, as well as a helical slotted cavity, in an effort to suppress the TEn1 modes, n does not equal 0. Analysis and numerical simulations from the 2 1/2-D PIC code MAGIC are presented, as well as the latest experimental results.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas A. Spencer, Thomas A. Spencer, Ralph A. N. Peredo, Ralph A. N. Peredo, Moe Joseph Arman, Moe Joseph Arman, Kyle J. Hendricks, Kyle J. Hendricks, Kirk E. Hackett, Kirk E. Hackett, Rudy Sedillo, Rudy Sedillo, Dale R. Ralph, Dale R. Ralph, Michael C. Scott, Michael C. Scott, Ronald M. Gilgenbach, Ronald M. Gilgenbach, } "Mode competition in a high-current high-voltage Gyro-BWO experiment", Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); doi: 10.1117/12.218570; https://doi.org/10.1117/12.218570
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