scholarly journals Toroidal mode observations and their interpretation in terms of anisotropy and density

10.33540/1111 ◽  
2021 ◽  
Author(s):  
◽  
Simon Andreas Schneider
Keyword(s):  
Toroidal Mode

scholarly journals A novel measurement of marginal Alfvén Eigenmode stability during high power auxiliary heating in JET

2021 ◽  
Author(s):  
Roy Alexander Tinguely ◽  
Nicolas Fil ◽  
Paulo Puglia ◽  
Stuart Dowson ◽  
Miklos Porkolab ◽  
...  
Keyword(s):  
High Power ◽  
Edge Density ◽  
Plasma Discharges ◽  
Auxiliary Heating ◽  
Magnetic Shear ◽  
Mode Identification ◽  
Toroidal Mode ◽  
Mhd Simulations ◽  
Alfven Eigenmodes ◽  
Good Agreement

Abstract The interaction of Alfvén Eigenmodes (AEs) and energetic particles is one of many important factors determining the success of future tokamaks. In JET, eight in-vessel antennas were installed to actively probe stable AEs with frequencies ranging 25-250 kHz and toroidal mode numbers |n| < 20. During the 2019-2020 deuterium campaign, almost 7500 resonances and their frequencies f, net damping rates γ < 0, and toroidal mode numbers were measured in almost 800 plasma discharges. From a statistical analysis of this database, continuum and radiative damping are inferred to increase with edge safety factor, edge magnetic shear, and when including non-ideal effects. Both stable AE observations and their associated damping rates are found to decrease with |n|. Active antenna excitation is also found to be ineffective in H-mode as opposed to L-mode; this is likely due to the increased edge density gradient's effect on accessibility and ELM-related noise's impact on mode identification. A novel measurement is reported of a marginally stable, edge-localized Ellipticity-induced AE probed by the antennas during high-power auxiliary heating (ICRH and NBI) up to 25 MW. NOVA-K kinetic-MHD simulations show good agreement with experimental measurements of f, γ, and n, indicating the dominance of continuum and electron Landau damping in this case. Similar experimental and computational studies are planned for the recent hydrogen and ongoing tritium campaigns, in preparation for the upcoming DT campaign.

scholarly journals Multifrequency compressional magnetic field oscillations and their relation to multiharmonic toroidal mode standing Alfvén waves

2015 ◽  
Vol 120 (12) ◽  
pp. 10,384-10,403 ◽  
Author(s):  
Kazue Takahashi ◽  
Colin Waters ◽  
Karl-Heinz Glassmeier ◽  
Craig A. Kletzing ◽  
William S. Kurth ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Toroidal Mode

Plasma isotopic effect on the damping rate of toroidal Alfvén eigenmodes with intermediate toroidal mode numbers

2012 ◽  
Vol 52 (9) ◽  
pp. 094006 ◽  
Author(s):  
D. Testa ◽  
T. Panis ◽  
P. Blanchard ◽  
A. Fasoli ◽  
Keyword(s):  
Isotopic Effect ◽  
Toroidal Mode ◽  
Alfven Eigenmodes ◽  
Damping Rate

Toroidal mode coupling effects on drift wave stability

1978 ◽  
Vol 21 (8) ◽  
pp. 1366 ◽  
Author(s):  
Wendell Horton ◽  
R. Estes ◽  
H. Kwak ◽  
Duk-In Choi
Keyword(s):  
Mode Coupling ◽  
Coupling Effects ◽  
Drift Wave ◽  
Toroidal Mode ◽  
Wave Stability

On toroidal mode eigenfrequencies

1969 ◽  
Vol 17 (6) ◽  
pp. 1281-1284 ◽  
Author(s):  
S.L. Kahalas
Keyword(s):  
Toroidal Mode

An inverse method using toroidal mode data

1986 ◽  
Vol 2 (1) ◽  
pp. 111-130 ◽  
Author(s):  
C Willis
Keyword(s):  
Inverse Method ◽  
Toroidal Mode
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