Stabilization of the Frequency of Relativistic S-Band Magnetron With Radial Output

Sayapin, A.; Levin, A.; Krasik, Yakov E.

doi:10.1109/tps.2013.2280818

IEEE Trans. Plasma Sci.

2013

DOI: 10.1109/tps.2013.2280818

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Stabilization of the Frequency of Relativistic S-Band Magnetron With Radial Output

A. Sayapin

A. Levin

Yakov E. Krasik

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Cited by 8 publications

(1 citation statement)

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“…Namely, the power of the microwave pulses and the frequency vary significantly with very small changes in the reflection coefficient of the microwaves from the load; 19 the microwave generation continues despite a significant decrease (to a half) in the applied voltage and the microwave frequency drifts (by $10%) relative to their value at the beginning of the oscillations. [20][21][22] In addition, in RM experiments 10 with multi-channel microwave output, the power radiated from the open resonant cavities adjacent to closed cavities was found to depend on the direction of the external axial magnetic field. These results show that the operation of this highimpedance magnetically insulated electron diode with an A6 anode block differs significantly from the conventional description of magnetrons.…”

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confidence: 99%

S-band microwave radiation by a high-impedance diode with an A6 anode block

Sayapin

Dai²,

Krasik

2017

Applied Physics Letters

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The results of experimental research of the intensity distribution of microwave fields in the resonant cavities of an A6 anode block with a high-impedance (!120 X) magnetically insulated electron diode powered by a Linear Induction Accelerator (LIA) ($350 kV, $2.5 kA, 150 ns) are presented. The power and duration of the microwave pulses obtained from one cavity varied in the range of 200-300 MW and 120-50 ns, respectively, depending on the charging voltage of the LIA and the value of the axial magnetic field. It was found that the field intensity in cavities adjacent to the extraction cavity differs by $3 times and that the field intensity gradually increases along the series of cavities. The direction of this increase coincides with the direction of the electrons' E Â B drift, i.e., the change in the magnetic field direction results in the change in the direction of the increase in the intensity of the field in the cavities.

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mentioning

confidence: 99%

S-band microwave radiation by a high-impedance diode with an A6 anode block

Sayapin

Dai²,

Krasik

2017

Applied Physics Letters

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Particle-in-cell based parameter study of 12-cavity, 12-cathode rising-sun relativistic magnetrons for improved performance

et al. 2015

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Particle-in-cell simulations are performed to analyze the efficiency, output power and leakage currents in a 12-Cavity, 12-Cathode rising-sun magnetron with diffraction output (MDO). The central goal is to conduct a parameter study of a rising-sun magnetron that comprehensively incorporates performance enhancing features such as transparent cathodes, axial extraction, the use of endcaps, and cathode extensions. Our optimum results demonstrate peak output power of about 2.1 GW, with efficiencies of ∼70% and low leakage currents at a magnetic field of 0.45 Tesla, a 400 kV bias with a single endcap, for a range of cathode extensions between 3 and 6 centimeters.

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Review of the relativistic magnetron

Andreev

Kuskov

Schamiloglu

2019

Matter and Radiation at Extremes

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The cavity magnetron is the most compact, efficient source of high-power microwave (HPM) radiation. The imprint that the magnetron has had on the world is comparable to the invention of the nuclear bomb. High- and low-power magnetrons are used in many applications, such as radar systems, plasma generation for semiconductor processing, and—the most common—microwave ovens for personal and industrial use. Since the invention of the magnetron in 1921 by Hull, scientists and engineers have improved and optimized magnetron technology by altering the geometry, materials, and operating conditions, as well as by identifying applications. A major step in advancing magnetrons was the relativistic magnetron introduced by Bekefi and Orzechowski at MIT (USA, 1976), followed by the invention of the relativistic magnetron with diffraction output (MDO) by Kovalev and Fuks at the Institute of Applied Physics (Soviet Union, 1977). The performance of relativistic magnetrons did not advance significantly thereafter until researchers at the University of Michigan and University of New Mexico (UNM) independently introduced new priming techniques and new cathode topologies in the 2000s, and researchers in Japan identified a flaw in the original Soviet MDO design. Recently, the efficiency of the MDO has reached 92% with the introduction of a virtual cathode and magnetic mirror, proposed by Fuks and Schamiloglu at UNM (2018). This article presents a historical review of the progression of the magnetron from a device intended to operate as a high-voltage switch controlled by the magnetic field that Hull published in 1921, to the most compact and efficient HPM source in the twenty-first century.

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Stabilization of the Frequency of Relativistic S-Band Magnetron With Radial Output

Cited by 8 publications

References 4 publications

S-band microwave radiation by a high-impedance diode with an A6 anode block

S-band microwave radiation by a high-impedance diode with an A6 anode block

Particle-in-cell based parameter study of 12-cavity, 12-cathode rising-sun relativistic magnetrons for improved performance

Review of the relativistic magnetron

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