Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Paul McElhinney"'
Autor:
Sydney N. Williams, Sarah Allwood-Spiers, Paul McElhinney, Gavin Paterson, Jürgen Herrler, Patrick Liebig, Armin M. Nagel, John E. Foster, David A. Porter, Shajan Gunamony
Publikováno v:
Frontiers in Physics, Vol 9 (2021)
Purpose: Parallel transmit technology for MRI at 7 tesla will significantly benefit from high performance transmit arrays that offer high transmit efficiency and low mutual coupling between the individual array elements. A novel dual-mode transmit ar
Externí odkaz:
https://doaj.org/article/c9a14fe43c10468f8e7ad7cc2c03ba54
Autor:
Jürgen Herrler, Sydney N. Williams, Patrick Liebig, Belinda Ding, Paul McElhinney, Sarah Allwood‐Spiers, Christian R. Meixner, Shajan Gunamony, Andreas Maier, Arnd Dörfler, Rene Gumbrecht, David A. Porter, Armin M. Nagel
Publikováno v:
Magnetic Resonance in Medicine. 89:1888-1900
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe5a5d626c44625944740708c73b4048
https://doi.org/10.1002/mrm.29569
https://doi.org/10.1002/mrm.29569
Publikováno v:
Physics in medicine and biology.
This paper reviews the field of multiple or parallel radiofrequency (RF) transmission for magnetic resonance imaging (MRI). Currently the use of ultra-high field (UHF) MRI at 7 tesla and above is gaining popularity, yet faces challenges with non-unif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::961effcd012d51c08f2e82c2358835e1
https://pubmed.ncbi.nlm.nih.gov/36410046
https://pubmed.ncbi.nlm.nih.gov/36410046
SYNOPSIS The promise of supra-linear boost in signal-to-noise-ratio is driving the development of MRI at extremely high static field strengths, such as 10.5T and beyond. The shorter wavelengths in tissues at high Larmor frequency causes destructive i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c3d021a416f20a225ebb5695e944da4
Autor:
Lei Zhang, Graham Smith, Wenlong He, Paul McElhinney, Robert I. Hunter, Adrian W. Cross, Duncan A. Robertson, Craig R. Donaldson, Johannes McKay
Publikováno v:
IEEE Transactions on Electron Devices. 64:1763-1766
This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) U.K. under Research Grant EP/K029746/1, and Science and Technology Facilities Council (STFC) U.K. under Research Grants ST/K006673/1 & ST/K006703/1, ST/N002326/
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc9f7aeb0bf06b4f18cf6ffe2823b713
https://doi.org/10.1109/ted.2017.2660304
https://doi.org/10.1109/ted.2017.2660304
This paper presents the design and measurement of a HE11 mode multilayer window for a W-band gyro-amplifier. The window acts to seal the vacuum inside the amplifier whilst coupling out microwave power with minimal reflection and absorption. The Gauss
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6761028debcedca2d397e232a75ec2bc
https://eprints.gla.ac.uk/233695/2/233695.pdf
https://eprints.gla.ac.uk/233695/2/233695.pdf
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 63:3183-3190
The input coupler is an important component for a microwave amplifier. In this paper, a sidewall single-hole input coupler for a W-band gyrotron traveling-wave amplifier that operates at the frequency range of 90–100 GHz was designed and measured.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::efc30ea55b04622b98aa5ce9b41d8c0f
https://doi.org/10.1109/tmtt.2015.2464302
https://doi.org/10.1109/tmtt.2015.2464302
Publikováno v:
2017 10th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT).
This paper presents the design, simulation and measurement of two mode converting corrugated horns for application as the output launcher for a gyro-amplifier. Operating over the 90 to 100 GHz frequency range the horns act to convert the TE11 mode to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9da001f2846a9c8b3f238c2096a24e8b
https://doi.org/10.1109/ucmmt.2017.8068469
https://doi.org/10.1109/ucmmt.2017.8068469
Autor:
Alan D. R. Phelps, Lei Zhang, Adrian W. Cross, Wenlong He, Paul McElhinney, Craig R. Donaldson, Kevin Ronald
Publikováno v:
2017 IEEE International Conference on Plasma Science (ICOPS).
In this paper a gyrotron travelling wave amplifier (gyroTWA) based on a helically corrugated interaction region (HCIR) will be presented. The gyro-TWA has promising applications in areas such as RADAR, telecommunications, plasmas diagnostics and elec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1fc3b63327644d0b55cdce5732ef847f
https://doi.org/10.1109/plasma.2017.8496243
https://doi.org/10.1109/plasma.2017.8496243
Publikováno v:
18th International Vacuum Electronics Conference, IVEC 2017
An output system for a W-band (90-100 GHz) gyrotron-traveling wave amplifier is designed, simulated, measured and the results are presented. This is an updated system based on a previous design and the output shows more favorable properties for the a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::92a3d485a7b85632be8ed5062297f3e7
https://doi.org/10.1109/ivec.2017.8289673
https://doi.org/10.1109/ivec.2017.8289673