Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Speirs David"'
Autor:
Speirs, David C., Ruiz-Ruiz, Juan, Giacomin, Maurizio, Hall-Chen, Valerian H., Phelps, Alan D. R., Vann, Roddy, Huggard, Peter G., Wang, Hui, Field, Anthony, Ronald, Kevin
Plasma turbulence on disparate spatial and temporal scales plays a key role in defining the level of confinement achievable in tokamaks, with the development of reduced numerical models for cross-scale turbulence effects informed by experimental meas
Externí odkaz:
http://arxiv.org/abs/2408.15807
Autor:
Wilson Thomas, Freethy Simon, Henderson Mark, Köhn-Seeman Alf, Konoplev Ivan, Saarelma Samuli, Speirs David, Vann Roddy
Publikováno v:
EPJ Web of Conferences, Vol 277, p 01011 (2023)
GENRAY and CQL3D were used to estimate the Electron Bernstein Wave (EBW) current drive profiles and normalised current drive efficiency ζCD (6) for several STEP reactor concepts with varying temperature, density, geometry and magnetic field. ζCD >
Externí odkaz:
https://doaj.org/article/67a911a716cd423bba877cb07c5dad7c
Autor:
Freethy Simon, Figini Lorenzo, Henderson Mark, El-Haroun Hana, Eliason Bengt, Gibson Sam, Kirov Krassimir, Köhn-Seemann Alf, Konoplev Ivan, Saarelma Samuli, Sharma Ridhima, Speirs David, Vann Roddy, Webster Helen, Wilson Thomas
Publikováno v:
EPJ Web of Conferences, Vol 277, p 04001 (2023)
The UK’s Spherical Tokamak for Energy Production (STEP) reactor design program has recently taken the decision to use exclusively microwave-based heating and current drive (HCD) actuators for its reactor concepts. This is based on a detailed assess
Externí odkaz:
https://doaj.org/article/a314240aa5b342c28da57083840a0a4b
Autor:
Hall-Chen, Valerian H., Parra, Felix I., Hillesheim, Jon C., Ruiz, Juan Ruiz, Crocker, Neal A., Shi, Peng, Chu, Hong Son, Freethy, Simon J., Kogan, Lucy A., Peebles, William A., Pratt, Quinn T., Rhodes, Terry L., Ronald, Kevin, Scannell, Rory, Speirs, David C., Storment, Stephen, Trisno, Jonathan
The Doppler backscattering (DBS) diagnostic, also referred to as Doppler reflectometry, measures turbulent density fluctuations of intermediate length scales. However, when the beam's wavevector is not properly aligned perpendicular to the magnetic f
Externí odkaz:
http://arxiv.org/abs/2211.17141
Akademický článek
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Autor:
Wilson, Kieran J, Selman, Liam, Whyte, Colin G, MacInnes, Philip, Young, Alan R, Phelps, Alan R, Cross, Adrian W, Zhang, Liang, Eliasson, Bengt, Speirs, David C, Robertson, Craig W, Ronald, Kevin, Cairns, Robert, Alan, Bingham, Robert, Bamford, Ruth, Koepke, Mark E
Publikováno v:
63rd Annual Meeting of the APS Division of Plasma Physics
As a non-linear medium, parametric instabilities arise when powerful EM waves propagate in plasma. Such effects are seen in laser-plasma, RF–ionospheric and tokamak heating scenarios. Fusion plasmas in a spherical aspect tokamak are difficult to he
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=core_ac_uk__::c7d03ab5745d5e7a93b5d89febd7c98e
https://strathprints.strath.ac.uk/79446/1/Wilson_etal_APS_2021_Characterisation_oga_helicon_source_for_non_linear_microwave_coupling_experiments_in_a_magnetised_plasma.pdf
https://strathprints.strath.ac.uk/79446/1/Wilson_etal_APS_2021_Characterisation_oga_helicon_source_for_non_linear_microwave_coupling_experiments_in_a_magnetised_plasma.pdf
Publikováno v:
In Resources, Conservation & Recycling 2001 31(2):149-170
Ionospheric heating experiments using high frequency ordinary (O) mode electromagnetic waves have shown the induced formation of magnetic field-aligned density striations in the ionospheric F-region. These striations are observed in association with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=core_ac_uk__::2199c3b61d8cf401a989c4a8da684cb0
https://strathprints.strath.ac.uk/61896/8/Spiers_etal_JGRSP_2017_Two_dimensional_Vlasov_simulations_of_fast_stochastic_electron_heating.pdf
https://strathprints.strath.ac.uk/61896/8/Spiers_etal_JGRSP_2017_Two_dimensional_Vlasov_simulations_of_fast_stochastic_electron_heating.pdf
Autor:
Speirs, David, Eliasson, Bengt
The dataset contains data from Vlasov simulations of the mode conversion and trapping of upper hybrid waves in a two-dimensional density depletion/striation. Nonlinear wave-couplings leading to upper hybrid and lower hybrid turbulence, and the excita
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3e334facf881e14fa9247cebb51df37
Autor:
Leonova, Maria, Backfish, Michael, Bowring, Daniel, Freemire, Ben, Hunt, Christopher, Kochemirovskiy, Alexey, Lane, Peter, Luo, Tianhuan, Moretti, Alfred, Peterson, David, Popovic, Milorad, Speirs, David, Stanley, Timothy, Torun, Yagmur, Whyte, Colin, Yonehara, Katsuya
Publikováno v:
Scopus-Elsevier
A first electropolished 201-MHz RF cavity for the international Muon Ionization Cooling Experiment (MICE) has been assembled inside a special vacuum vessel and installed at the Fermilab's MuCool Test Area (MTA). The cavity and the MTA hall have been
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::beb7302d55130ae006e0025dc23290d0