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RECENT ADVANCES IN SAWTOOTH CONTROL
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
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2011 (English)In: Fusion science and technology, ISSN 1536-1055, E-ISSN 1943-7641, Vol. 59, no 3, 539-548 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 59, no 3, 539-548 p.
Keyword [en]
sawtooth control, electron cyclotron current drive, toroidally asymmetric fast ion distributions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-32629ISI: 000289175200009Scopus ID: 2-s2.0-79955587994OAI: oai:DiVA.org:kth-32629DiVA: diva2:411659
Note
QC 20110419Available from: 2011-04-19 Created: 2011-04-18 Last updated: 2017-12-11Bibliographically approved

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