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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
Transport of energetic ions due to sawteeth, Alfven eigenmodes and microturbulence
(IOP Publishing, 2011-04)
Utilizing an array of new diagnostics and simulation/modelling techniques, recent DIII-D experiments have elucidated a variety of energetic ion transport behaviour in the presence of instabilities ranging from ...
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
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
Impact of β n and Spectrum of n = 1 Applied Fields on Fast ion Losses in DIII-D
(Institute of Physics Publishing, 2023)
The effect of n = 1 magnetic perturbations (MPs) on prompt fast ion losses in DIII-D has been investigated using the light ion beam probe technique. The effect of normalized beta, β n, and the plasma response to the MPs ...
Artículo
Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra
(OP Publishing, 2014)
We present the first measurement of a local fast-ion 2D velocity distribution function f(v||, v⊥). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion Dα (FIDA) light ...
Artículo
Characterization of off-axis fishbones
(IOP Publishing, 2011-08)
Repetitive bursting instabilities with strong frequency chirping occur in highbeta, beam-heated plasmas with safety factor q > 1 in the DIII-D tokamak. Although the mode structures differ, in many ways, the off-axis ...
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 ...