Gyro-amplifiers as candidate RF drivers for TeV linear colliders

Granatstein, V.L.; Lawson, W.

doi:10.1109/27.532948

Cited by 97 publications

(23 citation statements)

References 41 publications

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“…11,12 At the University of Maryland, researchers have developed X-band, Ku-band, Ka-band, and W-band gyroklystron amplifier for future linear colliders applications. 13,14 In the past, we investigated and built a prototype of a ka-band second harmonic gyroklystron with 155 MHz instantaneous bandwidth and 241 kW output power in the Institute of Electronics, Chinese Academy of Sciences. 15 Now, we have focused on developing w-band high power gyroklystron amplifiers with properties suitable for next generation radar applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of a W-band four-cavity gyroklystron amplifier

Liu

Geng

2012

Physics of Plasmas

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Using a self-consistent nonlinear code and particle-in-cell simulation, the beam-wave interaction of a W-band four-cavity gyroklystron amplifier has been analyzed. The gyroklystron amplifier operates in the fundamental harmonic TE 01 circular electric mode. The dependence of the efficiency and gain on the input power and the electron velocity ratio are studied. The effect of the electron velocity spread on the bandwidth and the electronic efficiency is analyzed. The simulated results show that the designed stable gyroklystron amplifier can produce an output power of over 142 kW, 33.8% electronic efficiency, 37 dB gain, and a 3 dB bandwidth of 1 GHz for a 70 kV, 6 A electron beam.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of a W-band four-cavity gyroklystron amplifier

Liu

Geng

2012

Physics of Plasmas

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“…9 At the University of Maryland, we have been exploring the suitability of gyroklystrons and gyrotwystrons as drivers for high gradient linear accelerator structures. [10][11][12][13][14][15] The selection of the tube and operation modes used depends on a number of application requirements like peak and average power, gain, bandwidth and output field configuration. Significant milestones achieved at the University of Maryland in this direction include a 3-cavity first harmonic coaxial system, which produced over 75 MW of peak power at 8.57 GHz 13 and a two-cavity frequency-doubling system that produced 32 MW at 19.7 GHz.…”

Section: Introductionmentioning

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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“…[1] The main thrust of this work has been geared towards development of the gyroklystron. This device uses discrete cavities along a linear path where the beam-field interaction takes place as in a klystron, while utilizing the helically spiralling electron beam profile typically found in small orbit gyrotrons.…”

Section: Introductionmentioning

confidence: 99%

Operation of a three cavity second harmonic coaxial gyroklystron

Castle

Yovchev²,

Lawson³

et al.

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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At the University of Maryland, we have been developing gyroklystrons for advanced electron-positron linear collider applications. We have recently achieved over 80 MW of peak power at 8.6 GHz with a three-cavity first harmonic gyroklystron [2]. The interaction was observed between a 470 kV, 500 A annular, rotating beam and a sequence of TE 011 coaxial cavities. The efficiency was about 32% and the gain was about 30 dB. We are currently testing a three-cavity tube that is designed to produce over 100 MW of power at 17.14 GHz with an efficiency of 40%. The input cavity is the same TE 011 cavity used in the first harmonic experiment, but the buncher and output cavities are TE 021 cavities that operate at twice the cyclotron frequency. In this paper we will describe the design of the circuit and detail the hot test results. Finally, we will also describe the designs of tubes that are capable of higher gain and higher reprate operation.

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Gyro-amplifiers as candidate RF drivers for TeV linear colliders

Cited by 97 publications

References 41 publications

Numerical simulation of a W-band four-cavity gyroklystron amplifier

Numerical simulation of a W-band four-cavity gyroklystron amplifier

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

Operation of a three cavity second harmonic coaxial gyroklystron

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