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Breakdown of adiabatic invariance in spherical tokamaks [PDF]
, 2001 Thermal ions in spherical tokamaks have two adiabatic invariants: the magnetic moment and the longitudinal invariant. For hot ions, variations in magnetic-field strength over a gyro period can become sufficiently large to cause breakdown of the adiabatic
Alfvén H. +4 more
core +2 more sources
EPJ Web of Conferences, 2017 30 MHz fast-wave heating may be an effective tool for non-inductively ramping low-current plasmas to a level suitable for initiating up to 12 MW of neutral beam injection on the National Spherical Tokamak Experiment Upgrade (NSTX-U).
Taylor Gary +8 more
doaj +1 more source
Advances in Materials Science and Engineering, Volume 2014, Issue 1, 2014., 2014 The large volume vacuum systems are used in many industrial operations and research laboratories. Accidents in these systems should have a relevant economical and safety impact. A loss of vacuum accident (LOVA) due to a failure of the main vacuum vessel can result in a fast pressurization of the vessel and consequent mobilization dispersion of ...
A. Malizia +6 more
wiley +1 more source
Physics of Plasmas, 2019 Transient small-scale structures were identified in the wake of blobs moving poloidally through the scrape-off layer of high-powered H-mode plasmas in NSTX, using the gas puff imaging (GPI) diagnostic. These blob wakes had a poloidal wavelength in the range of λpol = 3.5 ± 0.7 cm, which is significantly smaller than the average blob scale of Lpol ∼ 12 ...
S. J. Zweben +5 more
openaire +2 more sources
EPJ Web of Conferences, 2012 The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at an axial toroidal field of up to 1 T, about twice the field available on NSTX. A 28 GHz electron cylotron resonance heating (ECRH) system is currently being planned for NSTX-U.
Hosea J.C. +4 more
doaj +1 more source
Short-scale turbulent fluctuations driven by the electron-temperature gradient in the national spherical torus experiment [PDF]
, 2019 Measurements with coherent scattering of electromagnetic waves in plasmas of the National Spherical Torus Experiment indicate the existence of turbulent fluctuations in the range of wave numbers k(perpendicular to)rho(e)=0.1-0.4, corresponding to a ...
Bell, RE +12 more
core +1 more source
A megawatt-level 28 GHz heating system for the National Spherical Torus Experiment Upgrade
EPJ Web of Conferences, 2015 The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at axial toroidal fields of ≤ 1 T and plasma currents, Ip ≤ 2 MA. The development of non-inductive (NI) plasmas is a major long-term research goal for NSTX-U.
Taylor G. +14 more
doaj +1 more source
Nuclear Materials and Energy, 2019 Tokamak plasma facing components have surface roughness that can cause microscopic spatial variations in erosion and deposition and hence influence material migration, erosion lifetime, dust and tritium accumulation, and plasma contamination.
C.H. Skinner +4 more
doaj +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
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