Mode competition in a high-current high-voltage Gyro-BWO experiment

Thomas A. Spencer; Ralph A. N. Peredo; Moe Joseph Arman; Kyle J. Hendricks; Kirk E. Hackett; Rudy Sedillo; Dale R. Ralph; Michael C. Scott; Ronald M. Gilgenbach

doi:10.1117/12.218570

8 September 1995 Mode competition in a high-current high-voltage Gyro-BWO experiment

Thomas A. Spencer, Ralph A. N. Peredo, Moe Joseph Arman, Kyle J. Hendricks, Kirk E. Hackett, Rudy Sedillo, Dale R. Ralph, Michael C. Scott, Ronald M. Gilgenbach

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Proceedings Volume 2557, Intense Microwave Pulses III; (1995) https://doi.org/10.1117/12.218570
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The Air Force Phillips Laboratory Gyro-BWO experiment is utilizing the RAMBO pulser, with electron beam parameters of: V_D equals 300-800 kV; I_D 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 TE_n1 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.

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Thomas A. Spencer, Ralph A. N. Peredo, Moe Joseph Arman, Kyle J. Hendricks, Kirk E. Hackett, Rudy Sedillo, Dale R. Ralph, Michael C. Scott, and Ronald M. Gilgenbach "Mode competition in a high-current high-voltage Gyro-BWO experiment", Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); https://doi.org/10.1117/12.218570

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KEYWORDS

Magnetism

Diodes

Electron beams

Waveguides

Diagnostics

Dispersion

Antennas

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