scholarly journals Resonant Toroidal Alfven Eigenmodes (RTAEs) in Neutral Beam Heated Reverse Magnetic Shear Plasmas on TFTR

10.2172/14674 ◽  
1999 ◽  
Author(s):  
C.Z. Cheng ◽  
G.Y.-Fu ◽  
N.N. Gorelenkov ◽  
R. Nazikian ◽  
R.V. Budny
Keyword(s):  
Neutral Beam ◽  
Magnetic Shear ◽  
Alfven Eigenmodes

Interpretation of core localized Alfvén eigenmodes in DIII-D and Joint European Torus reversed magnetic shear plasmas

2006 ◽  
Vol 13 (5) ◽  
pp. 056104 ◽  
Author(s):  
G. J. Kramer ◽  
R. Nazikian ◽  
B. Alper ◽  
M. de Baar ◽  
H. L. Berk ◽  
...  
Keyword(s):  
Magnetic Shear ◽  
Alfven Eigenmodes

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 Observation of Alfvén Eigenmodes driven by off-axis neutral beam injection in the TCV tokamak

2020 ◽  
Vol 62 (9) ◽  
pp. 095017
Author(s):  
B Geiger ◽  
A N Karpushov ◽  
P Lauber ◽  
S Sharapov ◽  
M Dreval ◽  
...  
Keyword(s):  
Neutral Beam Injection ◽  
Neutral Beam ◽  
Beam Injection ◽  
Alfven Eigenmodes

scholarly journals Dynamics of Plasma during the Formation of a Weak Negative Central Magnetic Shear Configuration Using Counter Neutral Beam Injection in the JFT-2M Tokamak.

2002 ◽  
Vol 78 (12) ◽  
pp. 1361-1367
Author(s):  
Kensaku KAMIYA ◽  
Haruyuki KIMURA ◽  
Hiroaki OGAWA ◽  
Hisato KAWASHIMA ◽  
Kazuhiro TSUZUKI ◽  
...  
Keyword(s):  
Neutral Beam Injection ◽  
Neutral Beam ◽  
Magnetic Shear ◽  
Beam Injection

Alfvén eigenmodes in reversed shear plasmas in JT-60U negative-ion-based neutral beam injection discharges

2005 ◽  
Vol 12 (8) ◽  
pp. 082509 ◽  
Author(s):  
M. Takechi ◽  
A. Fukuyama ◽  
M. Ishikawa ◽  
C. Z. Cheng ◽  
K. Shinohara ◽  
...  
Keyword(s):  
Neutral Beam Injection ◽  
Negative Ion ◽  
Neutral Beam ◽  
Beam Injection ◽  
Alfven Eigenmodes ◽  
Reversed Shear

Observation of Helicity-Induced Alfvén Eigenmodes in Large-Helical-Device Plasmas Heated by Neutral-Beam Injection

2003 ◽  
Vol 91 (24) ◽  
Author(s):  
S. Yamamoto ◽  
K. Toi ◽  
N. Nakajima ◽  
S. Ohdachi ◽  
S. Sakakibara ◽  
...  
Keyword(s):  
Neutral Beam Injection ◽  
Neutral Beam ◽  
Beam Injection ◽  
Alfven Eigenmodes

scholarly journals Coupling of Neutral-Beam-Driven Compressional Alfvén Eigenmodes to Kinetic Alfvén Waves in NSTX Tokamak and Energy Channeling

2015 ◽  
Vol 115 (1) ◽  
Author(s):  
E. V. Belova ◽  
N. N. Gorelenkov ◽  
E. D. Fredrickson ◽  
K. Tritz ◽  
N. A. Crocker
Keyword(s):  
Alfven Waves ◽  
Neutral Beam ◽  
Alfvén Waves ◽  
Alfven Eigenmodes ◽  
Kinetic Alfvén Waves

scholarly journals Active real-time control of Alfvén eigenmodes by neutral beam and electron cyclotron heating in the DIII-D tokamak

2018 ◽  
Vol 58 (12) ◽  
pp. 124001
Author(s):  
Wenhui Hu ◽  
K.E.J. Olofsson ◽  
A.S. Welander ◽  
W.W. Heidbrink ◽  
M.A. Van Zeeland ◽  
...  
Keyword(s):  
Real Time ◽  
Electron Cyclotron ◽  
Neutral Beam ◽  
Electron Cyclotron Heating ◽  
Real Time Control ◽  
Time Control ◽  
Alfven Eigenmodes
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