Dr Wenlong He

Senior Research Fellow



Theory and simulations of a gyrotron backward wave oscillator using a helical interaction waveguide
Cross AW, Phelps ADR, Ronald K, He W, Whyte C, Robertson CW, Young AR
Applied Physics Letters Vol 89 (2006)
Experimental study of coaxial free-electron maser based on two-dimensional distributed feedback
Konoplev IV, McGrane P, He W, Cross AW, Phelps ADR, Whyte CG, Ronald K, Robertson CW
Physical Review Letters Vol 96, pp. 035002/1-035002/4 (2006)
Gyro-BWO experiments using a helical interaction waveguide
He W, Ronald K, Young AR, Cross AW, Phelps ADR, Whyte CG, Rafferty EG, Thomson J, Robertson CW, Speirs David, Samsonov SV, Bratman VL, Denisov GG
IEEE Transactions on Electron Devices Vol 52, pp. 839-844 (2005)
Microwave pulse compression using a helically corrugated waveguide
Burt Graeme, Samsonov SV, Phelps ADR, Bratman VL, Ronald K, Denisov GG, He W, Young AR, Cross AW, Konoplev IV
IEEE Transactions on Plasma Science Vol 33, pp. 661-667 (2005)
Measurements of pulse modulation in an ECM
Ronald K, Cross AW, Phelps ADR, He W, Whyte CG, Thomson J, Rafferty E, Konoplev IV
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Vol 528, pp. 120-124 (2004)
Simulation of high power broadband cyclotron autoresonance maser amplifier and electron beam experiments
Speirs David, Phelps ADR, Konoplev IV, Cross AW, He W
Review of Scientific Instruments Vol 75, pp. 826-831 (2004)

more publications

Professional activities

Keynote speak (IRMMW-THz 2018)
Plenary speaker @ EAPPC and BEAMS 2018
IEEE Microwave and Wireless Components Letters (Journal)
Peer reviewer
Keynote speak at IET Active & Passive rf Devices
Electronics Letters (Journal)
Peer reviewer
IET Microwaves, Antennas & Propagation (Journal)
Peer reviewer

more professional activities


Sheet electron beam vacuum electronic devices for the generation of high power THz radiation
Cross, Adrian (Principal Investigator) He, Wenlong (Co-investigator) Phelps, Alan (Co-investigator)
01-Jan-2018 - 31-Jan-2020
Doctoral Training Partnership (DTP 2016-2017 University of Strathclyde) | Nix, Laurence
He, Wenlong (Principal Investigator) Cross, Adrian (Co-investigator) Nix, Laurence (Research Co-investigator)
01-Jan-2017 - 01-Jan-2021
CW operation of 94GHz Gyro-TWA for telecommunications applications
He, Wenlong (Principal Investigator) Whyte, Colin (Co-investigator)
"This proposal will develop the world's highest power (kW), broadest instantaneous bandwidth, frequency agile amplifiers operating in the mm-wave/terahertz range. The gyro-amplifiers offers a unique opportunity to fill a long standing gap in the generation of high power coherent millimetre and sub millimetre wave radiation with its promise of amplification with an unprecedented 20% instantaneous bandwidth and an unrivalled power of 5kW at 94 GHz. Building on the recent success of W He et al PRL 2013, 110, art 165101, 2013, the mm/sub-mm wave gyro-TWA will enable a paradigm shift in what is achievable for a ground based, cellular telecommunications network by providing tera-bit data rates. This is possible due to the fact that the wireless gyro-TWA operating at sub-THz frequencies does not need to use opto-electronic components currently limiting data rates of optical schemes.

Another major area of development is the possibility of exploiting the world leading gyro-TWA to be used in Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarisation (DNP) spectroscopy which is currently hampered by the lack of high power sources and especially broadband amplifiers of terahertz radiation.

In addition the gyro-TWA would be an ideal source for cloud profiling radar and the detection of atmospheric pollutants because the atmospheric absorption, penetration and scattering losses, practical stand-off systems require considerable power, typically hundreds of watts. Other applications include high frequency long range security imaging, space situational awareness (detecting space debris), terrain mapping (volcano monitoring), radar and long range, high bandwidth, line of sight communications and real time video-rate detection of hidden explosives and illegal drugs."
01-Jan-2017 - 31-Jan-2020
Thermionic cathode produced small diameter electron beams for commercial THz radiation sources
He, Wenlong (Principal Investigator)
01-Jan-2016 - 31-Jan-2017
Generation of high power, high frequency radiation using high brightness pseudospark-sourced relativistic electron beams
He, Wenlong (Principal Investigator) Yin, Huabi (Co-investigator) Zhang, Liang (Researcher)
01-Jan-2016 - 31-Jan-2017
Development of a W-band gyro-amplifier for high power, wideband pulsed coherent applications
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

more projects


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