Zobrazeno 1 - 10
of 125
pro vyhledávání: '"Craig R. Donaldson"'
Autor:
Liang Zhang, Craig R. Donaldson, Jim Clarke, Jack Easton, Craig W. Robertson, Colin G. Whyte, Adrian W. Cross
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-10 (2022)
Abstract Microwave undulators (MUs) have great potential to be an alternative solution to permanent magnet undulators in a free electron laser (FEL) when shorter undulator periods are required. In this paper, the factors that affect the choice of the
Externí odkaz:
https://doaj.org/article/5f75ea617d75492ca53c3961a7577c58
Autor:
Craig R. Donaldson, Liang Zhang, Peter Hiscock, Michael Harris, Matthew J. Beardsley, Peter G. Huggard, Colin G. Whyte, Adrian W. Cross, Wenlong He
Publikováno v:
IEEE Transactions on Electron Devices. 69:347-352
The design, simulation, manufacture and measurement of a W-band five-fold (5F) helically corrugated waveguide (HCW) is reported. The 5F HCW is based on the coupling of the traveling TE31 and near cut-off TE22 modes to create an operating eigenwave. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b9c4ba49848c34588d255fad824ebc5
https://doi.org/10.1109/ted.2021.3130846
https://doi.org/10.1109/ted.2021.3130846
Autor:
Peter G. Huggard, Adrian W. Cross, Lei Zhang, Wenlong He, Matthew J. Beardsley, Craig R. Donaldson, Michael Harris, Colin G. Whyte
Publikováno v:
IEEE Electron Device Letters. 42:1544-1547
A manufacturing study of a 0.372 THz 8-fold (8F) helically corrugated interaction region (HCIR) and measurement of its wave dispersion characteristics are reported. This demonstrates the structure’s suitability as the electron beam / electromagneti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18380cf99819351f6944937e3c803ca3
https://doi.org/10.1109/led.2021.3105435
https://doi.org/10.1109/led.2021.3105435
Autor:
Liang Zhang, Craig R. Donaldson, Craig W. Robertson, Colin G. Whyte, Adrian W. Cross, Jim Clarke
Publikováno v:
2022 15th UK-Europe-China Workshop on Millimetre-Waves and Terahertz Technologies (UCMMT).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91afcb3a1b10e1af0e761db4258aa4cf
https://doi.org/10.1109/ucmmt56896.2022.9994836
https://doi.org/10.1109/ucmmt56896.2022.9994836
A broadband, kW-level gyrotron traveling wave amplifier (gyro-TWA) in W-band was developed based on a helically corrugated interaction region and a cusp electron gun. Experiments were carried out to demonstrate the versatility of the gyro-TWA and to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c9abd55ba6f4445344903e4f5efdc47
https://strathprints.strath.ac.uk/81217/1/Zhang_etal_EuMC_2021_Status_and_ongoing_development_of_a_KW_level_broadband_W_band_gyro_TWA.pdf
https://strathprints.strath.ac.uk/81217/1/Zhang_etal_EuMC_2021_Status_and_ongoing_development_of_a_KW_level_broadband_W_band_gyro_TWA.pdf
Publikováno v:
IEEE Transactions on Electron Devices. 68:364-368
In this article, a transmission line system for the propagation of millimeter-wave radiation is presented. The full system includes a TE11-to-TE01 mode converter, waveguide tapers, miter bends, and many straight sections. The design of each of these
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::358cceae2554911f568590b2dd9600bb
https://doi.org/10.1109/ted.2020.3039427
https://doi.org/10.1109/ted.2020.3039427
This paper presents the dispersion curve study of the helically corrugated waveguide using the 2D Finite Element Method (FEM) method based on the helicoidal coordinate transform. Calculation of the dispersion curve is 60 times faster compared with 3D
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5224ab6b993561f6e6daf61488920017
https://strathprints.strath.ac.uk/80580/1/Zhang_etal_IEEETED_2022_Dispersion_curve_of_the_helically_corrugated_waveguide_based_on_helicoidal_coordinate_transform.pdf
https://strathprints.strath.ac.uk/80580/1/Zhang_etal_IEEETED_2022_Dispersion_curve_of_the_helically_corrugated_waveguide_based_on_helicoidal_coordinate_transform.pdf
Autor:
Philip Macinnes, Craig R. Donaldson, Colin G. Whyte, Amy J. MacLachlan, Kevin Ronald, Alan D. R. Phelps, Adrian W. Cross
High-power microwave sources are typically relativistic in nature, employing multi-kilo-ampere electron beams that require significant magnetic confinement for efficient operation. As the desired output power increases so does the complexity, and ove
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d14f8cb2486309096954e2edb93e971
https://strathprints.strath.ac.uk/78991/1/MacInnes_etal_TED_2022_Numerical_analysis_of_high_power_X_band_sources_at_low_magnetic_confinement.pdf
https://strathprints.strath.ac.uk/78991/1/MacInnes_etal_TED_2022_Numerical_analysis_of_high_power_X_band_sources_at_low_magnetic_confinement.pdf
Autor:
Craig R. Donaldson, Alan D. R. Phelps, Colin G. Whyte, A. J. MacLachlan, Kevin Ronald, P. MacInnes, Adrian W. Cross
Publikováno v:
2021 IEEE International Conference on Plasma Science (ICOPS).
The numerical study of a low confining-field (~0.3T) X-band Backward Wave Oscillator (BWO), suitable for implementation as the microwave source(s) in a phase-synchronous array, is presented. Analytical theory and CST Particle Studio simulations have
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::298d14840086e962fe7a25191693abc7
https://doi.org/10.1109/icops36761.2021.9588496
https://doi.org/10.1109/icops36761.2021.9588496
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
This paper presents a numerical investigation of alternate gyrotron Traveling Wave Amplifier (gyro-TWA) configurations for increased gain. Previous experimental results showed a maximum stable gain of 37 dB over the frequency range 90-96 GHz. These r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ce7ca9242861b8cd8fa52d4dee5b1d5
https://doi.org/10.1109/irmmw-thz50926.2021.9567290
https://doi.org/10.1109/irmmw-thz50926.2021.9567290