Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Nielsen, Stefan Kragh"'
Publikováno v:
Phys. Rev. E 110, 025208 (2024)
The WKB approximation of geometrical optics is widely used in plasma physics, quantum mechanics and reduced wave modeling in general. However, it is well-known that the approximation breaks down at focal and turning points. In this work we present th
Externí odkaz:
http://arxiv.org/abs/2402.03882
Autor:
Kølsen de Wit Johan, Senstius Mads Givskov, Pedersen Asbjørn Clod, Ragona Riccardo, Nielsen Stefan Kragh
Publikováno v:
EPJ Web of Conferences, Vol 313, p 01002 (2024)
Observations from magnetically confined fusion experiments have in the past decades revealed instances of two-plasmon decay instabilities (TPDIs) between injected 2nd harmonic X-mode waves and trapped upper hybrid (UH) waves near half frequency of th
Externí odkaz:
https://doaj.org/article/27a4cdd0c94348909dfd142230f68d94
Publikováno v:
EPJ Web of Conferences, Vol 313, p 01003 (2024)
The Mega-Amp Spherical Tokamak Upgrade (MAST-U) is preparing to investigate microwave based current drive using an advanced wave coupling scheme known as O-X-B at high power. The main goal is to assert if this is an efficient method for current drive
Externí odkaz:
https://doaj.org/article/fe9b9748d96542e181d31f16bf6efb12
Autor:
Salewski, Mirko, Geiger, Benedikt, Jacobsen, Asger Schou, Garcıa-Munoz, Manuel, Heidbrink, Bill, Korsholm, Soren Bang, Leipold, Frank, Madsen, Jens, Moseev, Dmitry, Nielsen, Stefan Kragh, Rasmussen, Jesper, Stejner, Morten, Tardini, Giovanni, Weiland, Markus, team, the ASDEX Upgrade
Publikováno v:
Nuclear Fusion, vol: 54, issue: 2, pages: 023005, 2014
We present the first measurement of a local fast-ion 2D velocity distribution function $f(v_\parallel, v_\perp)$. To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion D-alpha (FIDA) light from th
Externí odkaz:
http://arxiv.org/abs/1509.08482
Autor:
Salewski, Mirko, Geiger, Benedikt, Heidbrink, Bill, Jacobsen, Asger Schou, Korsholm, Soren Bang, Leipold, Frank, Madsen, Jens, Moseev, Dmitry, Nielsen, Stefan Kragh, Rasmussen, Jesper, Stagner, Luke, Steeghs, Danny, Stejner, Morten, Tardini, Giovani, Weiland, Markus, team, the ASDEX Upgrade
Publikováno v:
Plasma Physics and Controlled Fusion, vol: 57, issue: 1, pages: 014021, 2015
Doppler tomography is a well-known method in astrophysics to image the accretion flow, often in the shape of thin discs, in compact binary stars. As accretion discs rotate, all emitted line radiation is Doppler-shifted. In fast-ion D-alpha (FIDA) spe
Externí odkaz:
http://arxiv.org/abs/1509.08440
Publikováno v:
EPJ Web of Conferences, Vol 277, p 01009 (2023)
Spherical tokamaks like the MAST Upgrade device are often operated in an overdense regime. As a consequence, conventional electron cyclotron resonance heating (ECRH) and current drive (ECCD) are typically not possible. MAST Upgrade is planned to inve
Externí odkaz:
https://doaj.org/article/08e174ab10b04d49b722d2a0f21fdaec
Akademický článek
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Autor:
Hansen, Søren Kjer, Nielsen, Stefan Kragh, Stober, J., Rasmussen, Jesper, Salewski, Mirko, Pedersen, Morten Stejner, Hoelzel, M.
Publikováno v:
46th EPS Conference on Plasma Physics
Europhysics Conference Abstracts (ECA)
ASDEX Upgrade Team, Hansen, S K, Nielsen, S K, Stober, J, Rasmussen, J, Salewski, M, Pedersen, M S & Hoelzel, M 2019, Parametric Decay Instabilities during Electron Cyclotron Resonance Heating at ASDEX Upgrade . in C R, S B, K M, K L, D B, P Brault & D F (eds), Proceedings of the 46th EPS Conference on Plasma Physics . vol. 43C, P1.1075, European Physical Society, 46th EPS Conference on Plasma Physics, Milan, Italy, 08/07/2019 . < http://ocs.ciemat.es/EPS2019PAP/html/ >
Europhysics Conference Abstracts (ECA)
ASDEX Upgrade Team, Hansen, S K, Nielsen, S K, Stober, J, Rasmussen, J, Salewski, M, Pedersen, M S & Hoelzel, M 2019, Parametric Decay Instabilities during Electron Cyclotron Resonance Heating at ASDEX Upgrade . in C R, S B, K M, K L, D B, P Brault & D F (eds), Proceedings of the 46th EPS Conference on Plasma Physics . vol. 43C, P1.1075, European Physical Society, 46th EPS Conference on Plasma Physics, Milan, Italy, 08/07/2019 . < http://ocs.ciemat.es/EPS2019PAP/html/ >
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::135237d428d253a254514a638c14eb1d
https://hdl.handle.net/21.11116/0000-0008-774B-F21.11116/0000-0004-D2C4-1
https://hdl.handle.net/21.11116/0000-0008-774B-F21.11116/0000-0004-D2C4-1
Autor:
Hansen, S. K., Nielsen, Stefan Kragh, Salewski, Mirko, Pedersen, Morten Stejner, Stober, J., Team, ASDEX Upgrade
Publikováno v:
Hansen, S K, Nielsen, S K, Salewski, M, Pedersen, M S, Stober, J & Team, ASDEX U 2017, ' Parametric decay instability near the upper hybrid resonance and anomalous mm-wave scattering in tokamak and stellarator plasmas ', E P J Web of Conferences, vol. 149, 03020 . https://doi.org/10.1051/epjconf/201714903020
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______1202::cc64c29d69d35294b3f1fdf0433d4136
https://orbit.dtu.dk/en/publications/f80c3f89-dd1e-4b84-ab36-499aad733573
https://orbit.dtu.dk/en/publications/f80c3f89-dd1e-4b84-ab36-499aad733573
Autor:
Salewski, Mirko, Geiger, Benedikt, Jacobsen, Asger Schou, Garcıa-Munoz, Manuel, Heidbrink, Bill, Korsholm, Soren Bang, Leipold, Frank, Madsen, Jens, Moseev, Dmitry, Nielsen, Stefan Kragh, Rasmussen, Jesper, Stejner, Morten, Tardini, Giovanni, Weiland, Markus, team, the ASDEX Upgrade
Publikováno v:
Salewski, M; Geiger, B; Jacobsen, AS; García-Muñoz, M; Heidbrink, WW; Korsholm, SB; et al.(2014). Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra. Nuclear Fusion, 54(2). doi: 10.1088/0029-5515/54/2/023005. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/71z8w06g
idUS: Depósito de Investigación de la Universidad de Sevilla
Universidad de Sevilla (US)
idUS. Depósito de Investigación de la Universidad de Sevilla
instname
Salewski, M, Geiger, B, Jacobsen, A S, García-Muñoz, M, Heidbrink, W W, Korsholm, S B, Leipold, F, Madsen, J, Moseev, D, Nielsen, S K, Rasmussen, J, Stejner Pedersen, M, Tardini, G & Weiland, M 2014, ' Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra ', Nuclear Fusion, vol. 54, no. 2, pp. 023005 . https://doi.org/10.1088/0029-5515/54/2/023005
Nuclear Fusion
idUS: Depósito de Investigación de la Universidad de Sevilla
Universidad de Sevilla (US)
idUS. Depósito de Investigación de la Universidad de Sevilla
instname
Salewski, M, Geiger, B, Jacobsen, A S, García-Muñoz, M, Heidbrink, W W, Korsholm, S B, Leipold, F, Madsen, J, Moseev, D, Nielsen, S K, Rasmussen, J, Stejner Pedersen, M, Tardini, G & Weiland, M 2014, ' Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra ', Nuclear Fusion, vol. 54, no. 2, pp. 023005 . https://doi.org/10.1088/0029-5515/54/2/023005
Nuclear Fusion
We present the first measurement of a local fast-ion 2D velocity distribution function f(ν∥, ν⊥). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion Dα (FIDA) light from the plasma centr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b8074ad175045f077f50aa2abcb1b8e
http://www.escholarship.org/uc/item/71z8w06g
http://www.escholarship.org/uc/item/71z8w06g