Multi-Mode Coupling Wave Theory for Helically Corrugated Waveguide

2017 Eighteenth International Vacuum Electronics Conference (IVEC)

Garner

et al. 2017

Self Cite

Section: Introductionmentioning

confidence: 99%

A multiple-hole input coupler for a 372 GHz gyro-travelling wave amplifier

2017 Eighteenth International Vacuum Electronics Conference (IVEC)

Garner

et al. 2017

Self Cite

“…Gyro-TWAs operating at mmwavelengths are under development at the University of Strathclyde. A gyro-TWA operating at 90 to 100 GHz was predicted to achieve about 40 dB gain, when it was driven by a 40 keV, 1.5 A axial-encircling large-orbit electron beam, and with a helically corrugated interaction region [4,5]. Another gyro-TWA operating at the higher centre frequency of 372 GHz, was modelled using CST Particle Studio.…”

Section: Introductionmentioning

confidence: 99%

Input coupling systems for mm-wave amplifiers

2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT)

Donaldson

Garner

et al. 2017

Self Cite

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“…A Wband gyrotron traveling wave amplifier (gyro-TWA) and gyrotron backward wave oscillator (gyro-BWO) [4] based on a cusp electron beam source [5][6][7] and a helically corrugated interaction region (HCIR) [8] have been developed to provide a continuously tuneable source with a continuous wave (CW) power output of ~5 kW and ~10 kW respectively. The gyro-TWA was simulated to have a 3 dB frequency bandwidth of 90-100 GHz while the gyro-BWO demonstrated a tuning range of 88-102.5 GHz and has achieved an output power of 12 kW [9] …”

Section: Introductionmentioning

confidence: 99%

W-Band Quasi-Optical Mode Converters for Gyro-Devices

McElhinney

Donaldson

2nd IET Annual Active and Passive RF Devices Seminar

et al. 2014

Abstract:A W-band corrugated horn has been designed, manufactured, and experimentally measured at the University of Strathclyde, for integration into a gyro-device as a quasi-optical launcher. This horn converts a cylindrical TE11 mode into a free space TEM00 mode in a frequency band of 84-104 GHz with a reflection better than -30 dB and a Gaussian coupling efficiency of ~98% and directivity of 26.6 dB at 95 GHz. The small beam waist makes such a horn ideal for use with a depressed collector system. The measured results are in excellent agreement with the numerical simulations. Introduction:Gyro-devices [1][2][3] are well suited to application in plasma physics, remote sensing and imaging and for electron spin resonance spectroscopy, due to the fast-wave cyclotron resonance maser instability, which is capable of producing high power coherent microwave radiation at frequencies(mm and sub-mm), that prove challenging for other sources. A Wband gyrotron traveling wave amplifier (gyro-TWA) and gyrotron backward wave oscillator (gyro-BWO) [4] based on a cusp electron beam source [5][6][7] and a helically corrugated interaction region (HCIR) [8] have been developed to provide a continuously tuneable source with a continuous wave (CW) power output of ~5 kW and ~10 kW respectively. The gyro-TWA was simulated to have a 3 dB frequency bandwidth of 90-100 GHz while the gyro-BWO demonstrated a tuning range of 88-102.5 GHz and has achieved an output power of 12 kW [9]