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Mostrando ítems 1-10 de 13
Artículo
Near midplane scintillator-based fast ion loss detector on DIII-D
(America Institute of Physics, 2012)
A new scintillator-based fast-ion loss detector (FILD) installed near the outer midplane of the plasma has been commissioned on DIII-D. This detector successfully measures coherent fast ion losses produced by fast-ion ...
Artículo
Scrape-off layer ion acceleration during fast wave injection in the DIII-D tokamak
(IOP Publishing, 2012-06)
Fast wave injection is employed on the DIII-D tokamak as a current drive and electron heating method. Bursts of energetic ions with energy Eo > 20 keV are observed immediately following fast wave injection in experiment ...
Artículo
Modulation of prompt fast-ion loss by applied n=2 fields in the DIII-D tokamak
(IOP Publishing, 2014)
Energy and pitch angle resolved measurements of escaping neutral beam ions (E approximate to 80 keV) have been made during DIII-D L-mode discharges with applied, slowly rotating, n = 2 magnetic perturbations. Data from ...
Artículo
Active control of Alfvén eigenmodes in magnetically confined toroidal plasmas
(IOP Publishing, 2019-05)
Alfvén waves are electromagnetic perturbations inherent to magnetized plasmas that can be driven unstable by a free energy associated with gradients in the energetic particles’ distribution function. The energetic particles ...
Artículo
Modeling the response of a fast ion loss detector using orbit tracing techniques in a neutral beam prompt-loss study on the DIII-D tokamak
(American Institute of Physics, 2010)
A numerical model describing the expected measurements of neutral beam prompt-losses by anewly commissioned fast ion loss detector FILD in DIII-D is presented. This model incorporatesthe well understood neutral beam ...
Artículo
Convective beam ion losses due to Alfven eigenmodes in DIII-D reversed-shear plasmas
(IOP Publishing, 2011-06)
Coherent losses of neutral beam ions are observed at frequencies corresponding to toroidal and reversed-shear Alfven eigenmodes (RSAEs) in DIII-D. ´ Reversed-shear profiles are created by injecting beam power during the ...
Artículo
Beam ion losses due to energetic particle geodesic acoustic modes
(IOP Publishing, 2012-12)
We report the first experimental observations of fast-ion loss in a tokamak due to energetic particle driven geodesic acoustic modes (EGAMs). A fast-ion loss detector installed on the DIII-D tokamak observes bursts of beam ...
Artículo
Electron cyclotron heating can drastically alter reversed shear Alfven eigenmode activity in DIII-D through finite pressure effects
(IOP Publishing, 2016-11)
A recent DIII-D experiment investigating the impact of electron cyclotron heating (ECH) on neutral beam driven reversed shear Alfvén eigenmode (RSAE) activity is presented. The experiment includes variations of ECH ...
Artículo
The effects of electron cyclotron heating and current drive on toroidal Alfven eigenmodes in tokamak plasmas
(IOP Publishing, 2018-01)
Dedicated studies performed for toroidal Alfvén eigenmodes (TAEs) in ASDEX-Upgrade (AUG) discharges with monotonic q-profiles have shown that electron cyclotron resonance heating (ECRH) can make TAEs more unstable. In ...
Artículo
Fast ion transport during applied 3D magnetic perturbations on DIII-D
(IOP Publishing, 2015-07)
Measurements show fast ion losses correlated with applied three-dimensional (3D) fields in a variety of plasmas ranging from L-mode to resonant magnetic perturbation (RMP) edge localized mode (ELM) suppressed H-mode ...