The design of a 100 MW, Ku band second harmonic gyroklystron experiment

Latham, P.E.; Lawson, W.; Irwin, V.

doi:10.1109/27.338296

Cited by 67 publications

(25 citation statements)

References 35 publications

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“…Even though the discussion given here has been restricted to window reflection, the analysis is general and can be applied to other types of reflectors. Moreover, we have shown that, similar to the large signal code MAGYKL [14], MAGY can be used for designing gyroklystrons. In particular, MAGY application is required for describing self-consistent effects.…”

Section: Z)mentioning

confidence: 99%

Modeling of gyroklystrons with MAGY

Nguyen

Levush

Antonsen

et al. 2000

IEEE Trans. Plasma Sci.

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Abstract-The self-consistent time-dependent code MAGY is presently being used for designing and modeling gyrodevices. In this paper, the code's self-consistent capability is used to investigate three different issues relating to the operation of gyroklystron amplifiers. These are the effect of window reflection on the properties of the output waves, higher order mode excitation in nonlinear output tapers, and excitation in cutoff drift sections. The first two effects can potentially have major impacts on the gyroklystron output radio frequency (RF) in terms of bandwidth power ripple, phase ripple across the band, and mode purity. In fact, strong correlation between simulation results and experimental data indicates that the observed bandwidth ripple in a recently tested W-band gyroklystron can be attributed to a small (-20-dB) window reflection. The last effect, excitation in cutoff drift sections, is found to result in a high level of RF fields at the drive frequency in drift sections. This effect impacts the design and use of lossy ceramics in the drift section because of thermal considerations, particularly in high average power devices.

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Section: Z)mentioning

confidence: 99%

Modeling of gyroklystrons with MAGY

Nguyen

Levush

Antonsen

et al. 2000

IEEE Trans. Plasma Sci.

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“…The circuit consists of a drive cavity, two idler cavities, and an output cavity. The circuit was designed with a timedependent version of the non-linear code MAGYKL [7]. The wave equation solved in MAGYKL is given by…”

Section: Theory and Designmentioning

confidence: 99%

“…Theoretical studies have shown that it is necessary to include many modes in the field description to correctly predict the resonant frequency of the cavity. In order to accurately predict the bandwidth of the amplifier, the formulation detailed in reference [7] was modified to include a frequency dependent drive power, as dictated by the resonant frequency and Q of in input cavity. The theoretical model was used to design the interaction circuit and determine the parameters of each cavity, which are summarized in Table 1.…”

Section: Theory and Designmentioning

confidence: 99%

Experimental investigation of a W-band gyroklystron amplifier

Blank

Danly²,

Levush³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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A four cavity W-band gyroklystron amplifier experiment is currently underway at the Naval Research Laboratory. The gyroklystron has produced 67 kW peak output power and 28% efficiency in the TE 011 mode with a 55 kV, 4.3 A annular electron beam. The full width half maximum (FWHM) bandwidth is greater than 460 MHz. Small signal and saturated gains of 36 dB and 29 dB, respectively, have been observed. The amplifier is zero drive stable and the limiting oscillation is the TE 011 operating mode in the output cavity. Experimental results are in good agreement with theoretical predictions.

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“…19 This analysis involves solving fairly complex equations that describe the interaction of electromagnetic fields with the electrons that make up the beam. MAGYKL uses the complex amplitude and phase of cold cavity fields as an input, and calculates the normalized current and frequency shift for a beam with specific parameters.…”

Section: B Microwave Circuit Design Proceduresmentioning

confidence: 99%

“…Self-oscillations affect mode and phase purity of the output signal and reduce the gain and efficiency of the amplifier. We use the small-signal code QPB 19 to check for potential self-oscillations in each of our cavities. This code calculates the product of the quality factor Q for a given cavity and the beam power.…”

Section: B Microwave Circuit Design Proceduresmentioning

confidence: 99%

Design of a high-power, high-gain, 2nd harmonic, 22.848 GHz gyroklystron

2013

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In this paper we consider the design of a four-cavity, high-gain K-band gyroklystron experiment for high gradient structure testing. The frequency doubling gyroklystron utilizes a beam voltage of 500 kV and a beam current of 200 A from a magnetron injection gun (MIG) originally designed for a lower-frequency device. The microwave circuit features input and gain cavities in the circular TE011 mode and penultimate and output cavities that operate at the second harmonic in the TE021 mode. We investigate the MIG performance and study the behavior of the circuit for different values of perpendicular to parallel velocity ratio (α = V⊥ / Vz). This microwave tube is expected to be able to produce at least 20 MW of power in 1μs pulses at a repetition rate of at least 120 Hz. A maximum efficiency of 26% and a large signal gain of 58 dB under zero-drive stable conditions were simulated for a velocity ratio equal to 1.35

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The design of a 100 MW, Ku band second harmonic gyroklystron experiment

Cited by 67 publications

References 35 publications

Modeling of gyroklystrons with MAGY

Modeling of gyroklystrons with MAGY

Experimental investigation of a W-band gyroklystron amplifier

Design of a high-power, high-gain, 2nd harmonic, 22.848 GHz gyroklystron

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