Relativistic Magnetron Driven by a Microsecond E-Beam Accelerator With a Ceramic Insulator

Lopez, Mike R.; Gilgenbach, R. M.; Jones, M. C.; White, W.; Jordan, David W.; Johnston, Mark D.; Strickler, Trevor; Neculaes, V.B.; Lau, Y. Y.; Spencer, Thomas A.; Haworth, M.D.; Cartwright, Keith; Mardahl, P.; Luginsland, J.W.; Price, David L.

doi:10.1109/tps.2004.828898

Cited by 26 publications

(10 citation statements)

References 16 publications

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“…The advantages of the RPM include: 1) larger cathode area yields much higher available electron current at a given current density; 2) larger anode area for improved heat dissipation; 3) decoupling of the design of the anode-cathode (AK) gap from the vane geometry; 4) scalability to higher powers by increasing the number of cavities (shown in simulations [8]); 5) decreased volume of magnetic field (scales as N) compared with that in conventional cylindrical magnetrons (scales as N 2 ), where N is the number of cavities. Computer simulations and experiments at the UM have demonstrated that this unoptimized RPM device can operate as a relativistic magnetron with similar efficiencies as conventional cylindrical relativistic magnetrons [9]- [13].…”

mentioning

confidence: 99%

Microwave Power and Phase Measurements on a Recirculating Planar Magnetron

Franzi

Greening

Jordan

et al. 2015

IEEE Trans. Plasma Sci.

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Calibrated microwave power and phase measurements are presented for the first recirculating planar magnetron prototype consisting of two coupled six-cavity 1-GHz planar cavity arrays. The results are presented for a solid cathode and two mode-control cathodes (MCCs) with aluminum or velvet electron emitters. The measurements were conducted using a prototype coaxial microwave power extraction scheme. The experimental operating parameters included: pulsed cathode voltages between −250 and −300 kV, voltage pulselengths of 200-600 µs, axial magnetic fields of 0.1-0.32 T, and entrance currents of 1-10 kA. The results showed improved oscillator frequency locking for the MCCs and increases in power and efficiency using the velvet electron emitter. Index Terms-Cavity magnetron, frequency locking, high-power microwaves (HPMs), recirculating planar magnetron (RPM), vacuum electronics.

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mentioning

confidence: 99%

Microwave Power and Phase Measurements on a Recirculating Planar Magnetron

Franzi

Greening

Jordan

et al. 2015

IEEE Trans. Plasma Sci.

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“…This is done to increase the bandwidth of the waveguide to allow for reduced waveguide widths which, in turn, allow for reduced phase velocities for the RF wave in the cavity. For reference, if a non-ridged waveguide were used and operated just above cutoff, the wave phase velocity would be just above c/2, which leads to a reduced maximum theoretical efficiency, when compared with standard relativistic magnetrons that typically have phase velocities ranging from 0.24c to 0.34c [4], [5]. For the present simulations, each waveguide has a width of 4.8 cm, a height of 2.5 cm and ridge radii of 1.0cm, resulting in a cutoff frequency below 2 GHz.…”

Section: Rpm Simulationsmentioning

confidence: 99%

A Pi-mode extraction scheme for the axial B-field recirculating planar magnetron

et al. 2012

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“…AFRL simulations and later UM experiments verified that the pi-mode was favored by the three-fold symmetry of a three-waveguide extraction system, which was utilized for most experiments. [7] Two of the three-extraction waveguides are terminated in UM-built water loads and power is monitored by calibrated (-60 dB) coupling loops in one arm. The third (priming) waveguide is attached through a UM-built TR switch and ferrite isolator to the AFRL priming magnetron output.…”

Section: Melba Accelerator and Magnetronmentioning

confidence: 99%

Relativistic Magnetron Priming Experiments and Theory

Gilgenbach¹,

Lau²

2005

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The publit reporting burden for this collection of information is estimated to average 1 hour per response, including ' gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Conthat notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a ». control number. PLEASE DO NOT RETURN YOUR FORWI TO THE ABOVE ORGANIZATION.AFRL-SR-AR-TR-05- PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)University of Michigan Ann Arbor, MI 48109 PERFORMING ORGANIZATION REPORT NUMBER SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Air Force Microwave/ RF priming experiments have been performed on the UM relativistic magnetron. The high power RF priming source (40 kV, non-relativistic magnetron) was obtained on-loan from the Air Force Research Lab. Microwave power output from the AFRL priming magnetron was input into one arm of the three-waveguide exfraction system on the relativistic magnetron. The UM/ Titan A6 relativistic magnetron was driven by MELBA-C; the ceramic insulator yields 10-8 Torr scale vacuum for quasi-hard-tube conditions. Microwave priming experiments showed mode-beating effects at power levels and frequency detuning consistent with Adier's equation. Effects of microwave priming on start-oscillation time and microwave pulselength were also characterized. Major breakthroughs in this research were the discovery and demonstration of two new magnetron priming techniques: magnetic priming and cathode priming. Magnetic priming was patented by UM (US patent No. 6,872,929

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Relativistic Magnetron Driven by a Microsecond E-Beam Accelerator With a Ceramic Insulator

Cited by 26 publications

References 16 publications

Microwave Power and Phase Measurements on a Recirculating Planar Magnetron

Microwave Power and Phase Measurements on a Recirculating Planar Magnetron

A Pi-mode extraction scheme for the axial B-field recirculating planar magnetron

Relativistic Magnetron Priming Experiments and Theory

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