Results 31 to 40 of about 1,608 (195)
Ohmic Flux Consumption During Initial Operation of the NSTX Spherical Torus [PDF]
, 2000 The spherical tokamak (ST), because of its slender central column, has very limited volt-second capability relative to a standard aspect ratio tokamak of similar plasma cross-section.
Kaye, S. +17 more
core +1 more source
The role of rectified currents in far-field RF sheaths and in SOL losses of HHFW power on NSTX
Nuclear Materials and Energy, 2017 Radio-frequency (RF) rectification is an important sheath phenomenon for wave heating of plasma in fusion devices and is proposed to be the mechanism responsible for converting high-harmonic fast-wave (HHFW) power in the National Spherical Torus ...
R.J. Perkins +8 more
doaj +1 more source
CTI in NSTX, Proposal for Compact Toroid Injection in NSTX [PDF]
, 2008 This is the final Report summarizing the activities of the proposal to invetigate the potential of deep fueling a spherical torus or tokamak using high velocity injection of compact toroids.
openaire +2 more sources
Edge Recycling and Heat Fluxes in L- and H-mode NSTX Plasmas [PDF]
, 2003 Introduction Edge characterization experiments have been conducted in NSTX to provide an initial survey of the edge particle and heat fluxes and their scaling with input power and electron density.
Roquemore, A. L. +7 more
core +1 more source
Excitation of toroidally localized harmonics of global Alfvén eigenmodes
Nuclear Fusion, 2023 The spherical tokamak NSTX and the upgraded, higher toroidal field, NSTX-U, routinely create plasmas with large un-thermalized populations of super-Alfvénic fast ions.
E.D. Fredrickson
doaj +1 more source
Electron cyclotron heating in NSTX [PDF]
AIP Conference Proceedings, 1997 Heating and current drive by electron cyclotron waves in high magnetic field tokamaks is commonly done by coupling power from the low-field side to the O-mode. However, for tokamaks with ωpe/ωce>1, such as the spherical tokamak NSTX, the O-mode is cutoff throughout most of the plasma.
K. C. Wu +3 more
openaire +1 more source
Validation of gyrokinetic simulations in NSTX and projections for high-k turbulence measurements in NSTX-U [PDF]
Physics of Plasmas, 2020 An extensive validation effort performed for a modest-beta NSTX NBI-heated H-mode discharge predicts that electron thermal transport can be entirely explained by electron-scale turbulence fluctuations driven by the electron temperature gradient mode (ETG), both in conditions of strong and weak ETG turbulence drive.
J. Ruiz Ruiz +9 more
openaire +3 more sources
Nuclear Materials and Energy, 2017 An innovative PFC diagnostic, the Materials Analysis Particle Probe (MAPP) was used to study the chemistry of Plasma Facing Components (PFCs) in the National Spherical Tokamak Experiment Upgrade (NSTX-U). NSTX-U used boronization as conditioning strategy
F. Bedoya +5 more
doaj +1 more source
Simulation Of Microtearing Turbulence In NSTX [PDF]
, 2012 Thermal energy confinement times in NSTX dimensionless parameter scans increase with decreasing collisionality. While ion thermal transport is neoclassical, the source of anomalous electron thermal transport in these discharges remains unclear, leading to considerable uncertainty when extrapolating to future ST devices at much lower collisionality ...
Guttenfelder, W. +10 more
openaire +2 more sources
Onset of High-Harmonic Fast Wave Propagation in Annulus Geometry [PDF]
EPJ Web of ConferencesPrevious experiments on NSTX have reported high-harmonic fast wave (HHFW) power losses in the scrape-off layer (SOL), with dependencies on the wave parallel wavenumber, plasma density, and magnetic field.
Baek Seung-Gyou +4 more
doaj +1 more source