Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Roddy G. L. Vann"'
Autor:
E. Tholerus, M. A. Van Zeeland, Roddy G. L. Vann, S. D. Pinches, R. J. Akers, Samuel Ward, P. Ollus, A. S. Jacobsen
Publikováno v:
Ward, S H, Akers, R, Jacobsen, A S, Ollus, P, Pinches, S D, Tholerus, E, Vann, R G L & Van Zeeland, M A 2021, ' Verification and validation of the high-performance Lorentz-orbit code for use in stellarators and tokamaks (LOCUST) ', Nuclear Fusion, vol. 61, no. 8, 086029 . https://doi.org/10.1088/1741-4326/ac108c
A novel high-performance computing algorithm, developed in response to the next generation of computational challenges associated with burning plasma regimes in ITER-scale tokamak devices, has been tested and is described herein. The Lorentz-orbit co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a61d32ecb6d51ab128de699b39f2bd9
https://aaltodoc.aalto.fi/handle/123456789/109192
https://aaltodoc.aalto.fi/handle/123456789/109192
Publikováno v:
Senstius, M G, Nielsen, S K & Vann, R G L 2020, ' Numerical investigations of parametric decay into trapped waves in magnetized plasmas with a non-monotonic density background ', Physics of Plasmas, vol. 27, 062102 . https://doi.org/10.1063/5.0004672
Physics of Plasmas
Physics of Plasmas
Parametric decay instabilities (PDIs) exciting daughter waves trapped inside a magnetized plasma with a non-monotonic density profile are investigated numerically. The investigation is motivated in particular by observations of low threshold PDI sign
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b96066a77d03e029fc092bdeb5376ba
https://orbit.dtu.dk/en/publications/cf17bcc1-ce3a-4565-834d-919491b4df44
https://orbit.dtu.dk/en/publications/cf17bcc1-ce3a-4565-834d-919491b4df44
Autor:
Mario Podesta, Roddy G. L. Vann, Eric Fredrickson, Nikolai Gorelenkov, Benjamin J. Q. Woods, Vinicius Duarte
Publikováno v:
IEEE Transactions on Plasma Science
Abrupt large events in the Alfvenic and sub-Alfvenic frequency bands in tokamaks are typically correlated with increased fast-ion loss. Here, machine learning is used to speed up the laborious process of characterizing the behavior of magnetic pertur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9741d5c23676e035b642c4999ab4b5b8
https://eprints.whiterose.ac.uk/156134/1/woods2020machine_final.pdf
https://eprints.whiterose.ac.uk/156134/1/woods2020machine_final.pdf
Publikováno v:
Computer Physics Communications. 228:61-68
In this work, we propose a positivity-preserving scheme for solving two-dimensional advection–diffusion equations including mixed derivative terms, in order to improve the accuracy of lower-order methods. The solution of these equations, in the abs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f320d0de036bf48fa33b778df069bb6
https://doi.org/10.1016/j.cpc.2018.03.004
https://doi.org/10.1016/j.cpc.2018.03.004
Autor:
H. Weber, Omar Maj, Antti Snicker, Eberhard Holzhauer, C.C. Petty, Alf Köhn, Kenneth W Gentle, Michael Brookman, Emanuele Poli, Max E Austin, L. Guidi, Rob J. La Haye, Matthew B. Thomas, Jarrod Leddy, Roddy G. L. Vann
Publikováno v:
EPJ Web of Conferences
EPJ Web of Conferences, Vol 203, p 01005 (2019)
EPJ Web of Conferences, Vol 203, p 01005 (2019)
Turbulent plasma edge density fluctuations can broaden a traversing microwave beam degrading its quality. This can be a problem for scenarios relying on a high spatial localization of the deposition of injected microwave power, like controlling MHD i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c91b26ec4d3235ad3bdfd3b1bc1d7a21
https://hdl.handle.net/21.11116/0000-0003-4119-821.11116/0000-0003-4117-A
https://hdl.handle.net/21.11116/0000-0003-4119-821.11116/0000-0003-4117-A
Autor:
Roddy G. L. Vann, Nikolai Gorelenkov, Vinicius Duarte, Anthony P. De-Gol, Benjamin J. Q. Woods
Publikováno v:
Nuclear Fusion
The creation and subsequent evolution of marginally-unstable modes have been observed in a wide range of fusion devices. This behaviour has been successfully explained, for a single frequency shifting mode, in terms of phase-space structures known as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b418a20c20151d12722e840ac27d935f
Autor:
Alexey Arefiev, Alf Köhn, Roddy G. L. Vann, Vladimir Shevchenko, E. J. Du Toit, Eberhard Holzhauer, Ilya Dodin
Publikováno v:
Arefiev, AV; Dodin, IY; Koehn, A; Du Toit, EJ; Holzhauer, E; Shevchenko, VF; et al.(2017). Kinetic simulations of X-B and O-X-B mode conversion and its deterioration at high input power. NUCLEAR FUSION, 57(11). doi: 10.1088/1741-4326/aa7e43. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/6qr8t2z2
Nuclear Fusion, vol 57, iss 11
Nuclear Fusion
NUCLEAR FUSION, vol 57, iss 11
Nuclear Fusion, vol 57, iss 11
Nuclear Fusion
NUCLEAR FUSION, vol 57, iss 11
Spherical tokamak plasmas are typically overdense and thus inaccessible to externally-injected microwaves in the electron cyclotron range. The electrostatic electron Bernstein wave (EBW), however, provides a method to access the plasma core for heati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a0927a4747563e2e048179b2f75fb54
http://www.escholarship.org/uc/item/6qr8t2z2
http://www.escholarship.org/uc/item/6qr8t2z2
Publikováno v:
EPJ Web of Conferences
EPJ Web of Conferences, Vol 147, p 01001 (2017)
EPJ Web of Conferences, Vol 147, p 01001 (2017)
The propagation of microwaves across a turbulent plasma density layer is investigated with full-wave simulations. To properly represent a fusion edge-plasma, drift-wave turbulence is considered based on the Hasegawa-Wakatani model. Scattering and bro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::348c2476224aa7b2c7494215c47ee06c
https://eprints.whiterose.ac.uk/119370/1/epjconf_ec2017_01001.pdf
https://eprints.whiterose.ac.uk/119370/1/epjconf_ec2017_01001.pdf
Autor:
A. Kirk, J. Horacek, C. D. Challis, I. Klimek, W. A. Peebles, K. Imada, W. A. Gracias, H. R. Wilson, A. W. Morris, L. Piron, K Tani, M. Wischmeier, Sean Conroy, D. A. Ryan, M. O’Brien, F. Arese Lucini, Fabio Riva, Ryota Imazawa, Sandra C. Chapman, Anders Nielsen, P. Cahyna, Nick Walkden, Michael Barnes, I. Fitzgerald, C. Gurl, G. Fishpool, A. Patel, Takuma Yamada, M. Cecconello, M. Turnyanskiy, Ben F. McMillan, A. R. Field, G. Cunningham, Y. Liu, T.R. Barrett, F. J. Casson, Michael F. J. Fox, M. Cox, G. Naylor, A.J. Thornton, Matthew Carr, Nicolas Fedorczak, R. Scannell, L. Pangione, L. Garzotti, N. C. Hawkes, Hiroshi Tanabe, T. Farley, Yasushi Ono, M. Evans, Gen Motojima, Daniel Dunai, T. O'Gorman, S. Saarelma, William Dorland, H. F. Meyer, G. McArdle, B. Huang, E. Havlickova, T. Watanabe, Michiaki Inomoto, R. O. Dendy, Paolo Ricci, Edmund Highcock, F. van Wyk, H. Leggate, Matthias Komm, Jens Madsen, Alexander Schekochihin, S. A. Silburn, I. T. Chapman, S.M. Kaye, Hajime Tanaka, Jeppe Olsen, F. Militello, S. D. Pinches, R. V. Perez, D. Harting, K. G. McClements, Jarrod Leddy, C. M. Roach, Roddy G. L. Vann, Luke Easy, Walter Guttenfelder, Patrick Tamain, Benjamin Daniel Dudson, M. G. O'Mullane, John Omotani, W. A. Cooper, B. Lloyd, Felix I. Parra, K. J. Gibson, EUROfusion Mst Team, S. Cardnell, N. J. Conway, O. M. Jones, W. Lai, J. Young, S. S. Henderson, Brendan M. Crowley, Romualdo Martín, Neal Crocker, A. Meakins, A. V. Danilov, Ray M. Sharples, D. L. Keeling, M. Gorelenkova, J. Simpson, J. Hollocombe, J. Adamek, Bogdan Hnat, N. Ben Ayed, L Kogan, Matthew Reinke, M. Valovic, J. R. Harrison, Bruce Lipschultz, Vladimir Shevchenko, Clive Michael, J. Storrs, M. Romanelli, M. Price, S. E. Sharapov, John Howard, J. Mailloux, N. Thomas-Davies, D. Muir, Stanislas Pamela, David Dickinson, James W. Bradley, M. Kocan, J. Chorley, Philippa Browning, H. P. Summers, Yuichi Takase, Vyacheslav S. Lukin, G. P. Maddison, J. Milnes, Keii Gi, L. Appel, Adam Stanier, Daniel Thomas, S. Allan, Ivan Lupelli, Young-chul Ghim, D. F. Howell, J. C. Hillesheim, S.W. Lisgo, A. N. Saveliev, David Taylor, W. Boeglin, Kazutake Kadowaki, J. Brunner, C. Ham, R. J. Akers, D. S. Darrow, B. Lomanowski, T. C. Hender, S. Elmore, Mast Team, Simon Freethy, S. Zoletnik, Kouji Shinohara
Publikováno v:
NUCLEAR FUSION
Nuclear Fusion
Nuclear fusion, 2016, Vol.57(10), pp.102007 [Peer Reviewed Journal]
Nuclear Fusion
Nuclear fusion, 2016, Vol.57(10), pp.102007 [Peer Reviewed Journal]
New results from MAST are presented that focus on validating models in order to extrapolate to future devices. Measurements during start-up experiments have shown how the bulk ion temperature rise scales with the square of the reconnecting field. Dur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d4cbc811b670e3be0e5a928793f091b
http://arxiv.org/abs/1611.06047
http://arxiv.org/abs/1611.06047
Publikováno v:
Plasma Physics and Controlled Fusion
It is not fully understood how electromagnetic waves propagate through plasma density fluctuations when the size of the fluctuations is comparable with the wavelength of the incident radiation. In this paper, the perturbing effect of a turbulent plas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb3d7a7fce666c15107ec775502ff808
https://eprints.whiterose.ac.uk/104571/1/final_version.pdf
https://eprints.whiterose.ac.uk/104571/1/final_version.pdf