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conference paper

Individual Sawtooth pacing by synchronized ECCD in TCV

Goodman, Timothy  
•
Felici, Federico Alberto Alfredo  
•
Canal, Gustavo
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2011
Radio Frequency Power in Plasmas: Proceedings of the 19th Topical Conference
19th Topical Conference on Radio Frequency Power in Plasmas, US-Japan Workshop on RF Physics

Previous real-time sawtooth control scenarios using EC actuators have attempted to shorten [1] or lengthen [2] the sawtooth period by optimally positioning the EC absorption near the q=1 surface. In new experiments we demonstrate for the first time that individual sawtooth crashes can be repetitively induced at predictable times by reducing the stabilizing ECCD power after a predetermined time from the preceding crash. Other stabilizing actuators ( e. g. ICRF, NBI) are expected to produce similar effects. Armed with these results, we present a new sawtooth / NTM control paradigm for improved performance in burning plasmas. The potential appearance of neo-classical tearing modes, triggered by long period sawtooth crashes even at low beta, becomes predictable and therefore amenable to preemptive ECCD. The ITER Electron Cyclotron Upper Launcher (EC-UL) design incorporates the needed functionalities for this method to be applied. The methodology and associated TCV experiments will be presented.

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Type
conference paper
DOI
10.1063/1.3665024
Web of Science ID

WOS:000301041300108

Author(s)
Goodman, Timothy  
•
Felici, Federico Alberto Alfredo  
•
Canal, Gustavo
•
Duval, Basil  
•
Graves, Jonathan  
•
Reimerdes, Holger  
•
Sauter, Olivier  orcid-logo
•
Testa, Duccio  
Date Issued

2011

Publisher

AIP conference Proceedings

Published in
Radio Frequency Power in Plasmas: Proceedings of the 19th Topical Conference
ISBN of the book

978-0-7354-0978-1

Series title/Series vol.

AIP conference Proceedings; 1406

Volume

1406

Subjects

sawteeth

•

Ech

•

Eccd

•

tokamak

•

Ntm

•

real-time

•

control

Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Event nameEvent placeEvent date
19th Topical Conference on Radio Frequency Power in Plasmas, US-Japan Workshop on RF Physics

Newport, USA

June 1-3, 2011

Available on Infoscience
May 4, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/79978
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