Details

Autor(en) / Beteiligte

• Lennholm, M
• Eriksson, L-G
• Turco, F
• Bouquey, F
• Darbos, C
• Dumont, R
• Giruzzi, G
• Jung, M
• Lambert, R
• Magne, R
• Molina, D
• Moreau, P
• Rimini, F
• Segui, J-L
• Song, S
• Traisnel, E

Titel

Demonstration of effective control of fast-ion-stabilized sawteeth by electron-cyclotron current drive

Ist Teil von

• Physical review letters, 2009-03, Vol.102 (11), p.115004-115004, Article 115004

Ort / Verlag

United States

Erscheinungsjahr

2009

Quelle

American Physical Society

Beschreibungen/Notizen

• In a tokamak plasma, sawtooth oscillations in the central temperature, caused by a magnetohydrodynamic instability, can be partially stabilized by fast ions. The resulting less frequent sawtooth crashes can trigger unwanted magnetohydrodynamic activity. This Letter reports on experiments showing that modest electron-cyclotron current drive power, with the deposition positioned by feedback control of the injection angle, can reliably shorten the sawtooth period in the presence of ions with energies >or=0.5 MeV. Certain surprising elements of the results are evaluated qualitatively in terms of existing theory.