Stable Confinement of High-Beta Collisionless Toroidal Plasma.

1981 ◽  
Vol 47 (3) ◽  
pp. 212-212 ◽  
Author(s):  
R. W. Schumacher ◽  
M. Fukao ◽  
A. Y. Wong ◽  
R. G. Suchannek ◽  
K. L. Lam ◽  
...  
Keyword(s):  
Toroidal Plasma ◽  
High Beta

High-beta stability of a toroidal plasma

1981 ◽  
Vol 84 (3) ◽  
pp. 123-128 ◽  
Author(s):  
L. Sugiyama ◽  
J.W.-K. Mark
Keyword(s):  
Toroidal Plasma ◽  
High Beta

Stable confinement of a high-beta toroidal plasma

1980 ◽  
Vol 20 (5) ◽  
pp. 635-638 ◽  
Author(s):  
S.C. Prager ◽  
J.H. Halle ◽  
M.W. Phillips ◽  
R.S. Post ◽  
J.C. Twichell
Keyword(s):  
Toroidal Plasma ◽  
High Beta

Free-boundary plasma equilibria with toroidal plasma flows

2022 ◽  
Author(s):  
Wenjin Chen ◽  
Zhiwei Ma ◽  
Haowei Zhang ◽  
Wei Zhang ◽  
Longwen Yan
Keyword(s):  
Plasma Temperature ◽  
Magnetic Axis ◽  
Free Boundaries ◽  
Plasma Flows ◽  
Plasma Parameters ◽  
Centrifugal Effect ◽  
Flux Function ◽  
Minor Radius ◽  
Toroidal Plasma ◽  
High Beta

Abstract Magnetohydrodynamic equilibrium schemes with toroidal plasma flows and the scrape-off layer are developed for the 'divertor-type' and 'limiter-type' free boundaries in the tokamak cylindrical coordinator. With a toroidal plasma flow, the flux functions are considerably different under the isentropic and isothermal assumptions. The effects of the toroidal flow on the magnetic axis shift are investigated. In a high beta plasma, the magnetic shift due to the toroidal flow are almost the same for both the isentropic and isothermal cases, and are about 0.04a0 (a0 is the minor radius) for M0=0.2 (the toroidal Alfvѐn Mach number on the magnetic axis). In addition, the X-point is slightly shifted upward by 0.0125 a0. But the magnetic axis and the X-point shift due to the toroidal flow may be neglected because M0 is usually less than 0.05 in a real tokamak. The effects of the toroidal flow on the plasma parameters are also investigated. The high toroidal flow shifts the plasma outward due to the centrifugal effect. Temperature profiles are noticeable different because the plasma temperature is a flux function in the isothermal case.

Possibility of detecting a high-beta-gamma LLW repository prior to underground space utilization

1999 ◽  
Vol 5 (2) ◽  
pp. 29-35
Author(s):  
Hiroyuki Ikuse ◽  
Shuji Hashimoto ◽  
Masafumi Yamamoto ◽  
Katsuhide Matsumura
Keyword(s):  
Underground Space ◽  
Space Utilization ◽  
High Beta

scholarly journals The upgraded TOMAS device: A toroidal plasma facility for wall conditioning, plasma production, and plasma–surface interaction studies

2021 ◽  
Vol 92 (2) ◽  
pp. 023506
Author(s):  
A. Goriaev ◽  
T. Wauters ◽  
S. Möller ◽  
R. Brakel ◽  
S. Brezinsek ◽  
...  
Keyword(s):  
Surface Interaction ◽  
Plasma Production ◽  
Plasma Surface ◽  
Toroidal Plasma ◽  
Interaction Studies

scholarly journals Causal modulation of right hemisphere fronto-parietal phase synchrony with Transcranial Magnetic Stimulation during a conscious visual detection task

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chloé Stengel ◽  
Marine Vernet ◽  
Julià L. Amengual ◽  
Antoni Valero-Cabré
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Visual Perception ◽  
Frequency Band ◽  
Magnetic Stimulation ◽  
Visual Detection ◽  
Detection Task ◽  
Oscillatory Activity ◽  
Top Down ◽  
The Right ◽  
High Beta

AbstractCorrelational evidence in non-human primates has reported increases of fronto-parietal high-beta (22–30 Hz) synchrony during the top-down allocation of visuo-spatial attention. But may inter-regional synchronization at this specific frequency band provide a causal mechanism by which top-down attentional processes facilitate conscious visual perception? To address this question, we analyzed electroencephalographic (EEG) signals from a group of healthy participants who performed a conscious visual detection task while we delivered brief (4 pulses) rhythmic (30 Hz) or random bursts of Transcranial Magnetic Stimulation (TMS) to the right Frontal Eye Field (FEF) prior to the onset of a lateralized target. We report increases of inter-regional synchronization in the high-beta band (25–35 Hz) between the electrode closest to the stimulated region (the right FEF) and right parietal EEG leads, and increases of local inter-trial coherence within the same frequency band over bilateral parietal EEG contacts, both driven by rhythmic but not random TMS patterns. Such increases were accompained by improvements of conscious visual sensitivity for left visual targets in the rhythmic but not the random TMS condition. These outcomes suggest that high-beta inter-regional synchrony can be modulated non-invasively and that high-beta oscillatory activity across the right dorsal fronto-parietal network may contribute to the facilitation of conscious visual perception. Our work supports future applications of non-invasive brain stimulation to restore impaired visually-guided behaviors by operating on top-down attentional modulatory mechanisms.

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