Publications

Optimization and measurement of an orthomode input coupling system for W-band gyro-amplifiers

Donaldson Craig, Zhang Liang, McNeil Rory, Robertson Craig, Whyte Colin

2024 Joint International Vacuum Electronics Conference and International Vacuum Electron Sources Conference (IVEC + IVESC) 2024 Joint International Vacuum Electronics Conference and International Vacuum Electron Sources Conference (IVEC + IVESC) (2024)

https://doi.org/10.1109/IVECIVESC60838.2024.10694999

Progress on the UoS PL-BWO experiment

Maclnnes P, Donaldson C, MacLachlan A J, Whyte C G, Ronald K, Phelps A D, Cross A W

2023 IEEE International Conference on Plasma Science (ICOPS) IEEE International Conference on Plasma Science (ICOPS) Vol 2023 (2024)

https://doi.org/10.1109/icops45740.2023.10481430

Feedhorn synthesis using a parameterized aperture field distribution

Zhang Liang, Whyte Colin G, Donaldson Craig R, Ronald Kevin, Cross Adrian W

IEEE Electron Device Letters Vol 45, pp. 252-255 (2024)

https://doi.org/10.1109/LED.2023.3345222

Helically corrugated interaction regions for W-band gyrotron-Traveling Wave Amplifiers

Donaldson Craig R, Zhang Liang, Robertson Craig W, MacInnes Philip, Whyte Colin G

2023 53rd European Microwave Conference (EuMC) 2023 53rd European Microwave Conference (EuMC) 2023 53rd European Microwave Conference (EuMC) (2023)

https://doi.org/10.23919/eumc58039.2023.10290435

Microwave undulator to generate short-wavelength FEL radiation

Zhang Liang, Donaldson Craig R, Robertson Craig W, Whyte Colin G, Cross Adrian W, Clarke Jim

2022 15th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT) 2022 15th UK-Europe-China Workshop on Millimetre-Waves and Tetrahertz Technologies (UCMMT) 2022 15th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT), pp. 1-3 (2022)

https://doi.org/10.1109/ucmmt56896.2022.9994836

Quasi-optical output for a high gain, broadband W-band amplifier

Donaldson C R, Smith G M, Robertson D A, Robertson C W, Zhang L, MacInnes P, Whyte C G

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (2022)

https://doi.org/10.1109/irmmw-thz50927.2022.9895885

More publications

Research Interests

Broadband, high power, mm-wave/terahertz gyrotron travelling wave amplifiers for telecommunications and space object identification; Gyrotron backward wave oscillator; Electron beam generation; Beam-wave interaction; novel manufacturing techniques; electrodeposition and electroforming; and pulsed power technologies.

Professional Activities

International Vacuum Electronics Conference

Chair

15/4/2025

Modulated cusp electron gun for millimeter-wave gyro-amplifiers

Speaker

15/4/2025

Millimetre-wave amplifier for plasma diagnostics and space situational awareness

Speaker

6/1/2025

Gyro-amplifiers for space situational awareness

Speaker

29/11/2024

Space-Comm Expo

Participant

11/9/2024

Space Academic Network (SPAN) (External organisation)

Advisor

3/9/2024

More professional activities

Projects

RCloud ISAR2 R-Cloud+ RQ0000051831 - Phase 2 Low Earth Orbit (LEO) Inverse Synthetic Aperture Radar (ISAR) Study and De-Risking Programme

Whyte, Colin (Principal Investigator) Donaldson, Craig (Co-investigator) Robertson, Craig (Co-investigator)

01-Jan-2024 - 30-Jan-2025

Demonstrating Key technology for cm resolution ISAR imaging of LEO...

Whyte, Colin (Principal Investigator) Cross, Adrian (Co-investigator) Donaldson, Craig (Research Co-investigator)

18-Jan-2021 - 31-Jan-2023

Phase Locked High Powered Microwave Sources

Whyte, Colin (Principal Investigator) Cross, Adrian (Co-investigator) Robertson, Craig (Research Co-investigator) Donaldson, Craig (Researcher)

01-Jan-2020 - 30-Jan-2033

DC power supply to drive W-band gyrotron travelling wave amplifier for satellite uplink and wireless telecommunication applications

Donaldson, Craig (Researcher) Cross, Adrian (Principal Investigator) Ronald, Kevin (Co-investigator)

01-Jan-2019 - 30-Jan-2020

CW operation of 94GHz Gyro-TWA for telecommunications applications

Donaldson, Craig (Researcher) Cross, Adrian (Principal Investigator) Whyte, Colin (CoI) Zhang, Liang (Research Co-investigator) He, Wenlong (CoI)

01-Jan-2017 - 31-Jan-2020

Development of a W-band gyro-amplifier for high power, wideband, pulsed coherent applications

Donaldson, Craig (Researcher) He, Wenlong (Principal Investigator)

"The project will consolidate our technology in developing a new class of high power, wideband millimetre wave amplifier which offers a ten-fold increase in available bandwidth and a five-fold increase in available peak power over the amplifiers used in current pulsed coherent applications such as radar, magnetic resonance, security imaging and remote sensing. It will bring step changes to these applications and the success of this research will have a huge worldwide technological impact and offer tremendous economic benefit to the UK. The proposal is a collaboration between two major millimetre wave groups at the University of Strathclyde and the University of St Andrews who collectively have decades of experience and vibrant international reputations in the development of high power millimetre wave sources, radars, instrumentation and components, plus a strong track record in commercialisation, industrial collaboration, and delivering on project objectives. The gyro-amplifier represents a core technology that is likely to lead to UK leadership in the field of high power millimetre wave radar.

Pulsed electron paramagnetic resonance (EPR) and dynamic nuclear polarisation (DNP) enhanced Nuclear Magnetic Resonance (NMR) instruments based on this gyro-amplifier technology will result in radically improved sensitivities. The EPR and DNP enhanced NMR (including the possibility of pulsed DNP-NMR and the use of phase and amplitude modulation) experiments will give rise to absolutely world-leading research. It will strongly enhance the UK's position as a world leader in a wide range of academic research areas, including physics, chemistry, biology, engineering and medicine.

Atmospheric sensing and space debris tracking based on such an amplifier will allow long range monitoring of clouds, aerosols, precipitation (therefore enabling better global climate and pollution models for better prediction of weather and pollution, better management of natural resources and mitigation of natural hazards) and tracking of space debris (increasing safety for space travel and satellite launching). This will lead to greater radar sensitivity, enabling measurement of smaller or more tenuous particulates, with finer resolution, at longer ranges or in a shorter timescale. The technology also has the potential to be applied to the ground based mapping of space debris, a major consideration for all orbiting systems including environmental monitoring satellites.

The high power capability of hundreds watts of the gyro-amplifier in the hundred GHz to 1THz frequency range will allow standoff, real time video rate security imaging and sensing enabling high resolution 3D imaging and highly sensitive sensing of most hidden contrabands such as explosives, illegal drugs and chemical and biological materials. The project has the potential to disrupt a large fraction of the existing X-ray based security market. The research team at Strathclyde is a world leader in this terahertz amplification area and can realise the application pull through collaborating with wide UK terahertz imaging and sensing community and industries."

01-Jan-2015 - 31-Jan-2016

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