Recent Advances in Sawtooth Control
Important advances have been made recently in the invention and application of experimental methods to control the sawtooth instability in tokamak plasmas. The primary means of control involves the application of either ion cyclotron resonance heating (ICRH), or electron cyclotron heating, with resonance very close to the q = 1 radius in the plasma core. Reported here are experiments that have successfully applied these methods to either shorten or lengthen the sawteeth deliberately, in a variety of plasma conditions, in three tokamaks: Joint European Torus (JET), TCV, and Tore Supra. It is shown that despite the sensitivity of the sawtooth period to the resonance position, sawteeth can be controlled using either real-time control of the electron cyclotron deposition, or in the case of ion cyclotron heating, very careful adjustment of the magnetic field strength and minority ion concentration. The latter technique has been guided by theoretical advances that have enabled the control of sawteeth in JET with ITER-relevant ICRH scenarios.
- View record in Web of Science
- URL: http://epubs.ans.org/rip/index.cgi?j=fst
- URL: http://crpplocal.epfl.ch/pinboard/jpapers/1003203.pdf
Keywords: sawtooth control ; electron cyclotron current drive ; toroidally asymmetric fast ion distributions ; Toroidal Plasma Rotation ; Ion-Cyclotron Range ; Internal Kink Mode ; Current Drive ; Stabilization ; Sawteeth ; Tokamak ; Jet ; Regime ; Period
Record created on 2011-06-23, modified on 2016-08-09