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The merits of ion cyclotron resonance heating schemes for sawtooth control in tokamak plasmas
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2015 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 81, no 06, 365810601Article in journal (Refereed) PublishedText
Abstract [en]

JET experiments have compared the efficacy of low-and high field side ion cyclotron resonance heating (ICRH) as an actuator to deliberately minimise the sawtooth period. It is found that low-field side ICRH with low minority concentration is optimal for saw tooth control for two main reasons. Firstly, low-field side heating means that any toroidal phasing of the ICRH (-90 degrees, +90 degrees or dipole) has a destabilising effect on the sawteeth, meaning that dipole phasing can be employed, since tins is preferable due to less plasma wall interaction from Resonant Frequency (RI) sheaths. Secondly, the resonance position of the low field side ICRH does not have to be very accurately placed to achieve saw tooth control, relaxing the requirement for real-time control of the RF frequency. These empirical observations have been confirmed by hybrid kinetic-magnetohydrodynamic modelling, and suggest that the ICRH antenna design for ITER is well positioned to provide a control actuator capable of having a significant effect on the sawtooth behaviour.

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Cambridge University Press, 2015. Vol. 81, no 06, 365810601
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Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-181391DOI: 10.1017/S0022377815000987ISI: 000367574600003ScopusID: 2-s2.0-84944342424OAI: diva2:899422

QC 20160201

Available from: 2016-02-01 Created: 2016-02-01 Last updated: 2016-02-01Bibliographically approved

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Johnson, ThomasTholerus, Simon
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