S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Advances in sawtooth control for NTM prevention in JET S. Coda 1, L.-G. Eriksson 2, J. Graves 1, R. Koslowski.

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Presentation transcript:

S. Coda, MHD workshop, PPPL, 22 Nov Advances in sawtooth control for NTM prevention in JET S. Coda 1, L.-G. Eriksson 2, J. Graves 1, R. Koslowski 3, F. Nave 4, P. Belo 4, R.J. Buttery 5, S. Cowley 6, P. de Vries 5,7, M.J. Mantsinen 8, M.-L. Mayoral 5, A. Mück 1, O. Sauter 1, E. Westerhof 7, and JET-EFDA contributors 1 CRPP, EPFL, Association Euratom-Fédération Suisse, Lausanne, Switzerland 2 Association Euratom-CEA, DRFC, Cadarache, France 3 Association Euratom-FZ Jülich, Institut für Plasmaphysik, TEC, Jülich, Germany 4 Associação Euratom-IST, Centro de Fusão Nuclear, Lisbon, Portugal 5 Euratom-UKAEA Fusion Association, Culham Science Center, United Kingdom 6 Department of Physics, Imperial College, London, United Kingdom 7 Association Euratom-FOM, FOM-Rijnhuizen, TEC, Nieuwegein, The Netherlands 8 Association Euratom-Tekes, Helsinki University of Technology, Finland

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Outline NTM triggering by long sawteeth Sawtooth destabilization by ICCD Sawtooth destabilization by counter-NBI

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Long sawteeth trigger (3,2) NTMs at low  N O. Sauter et al., PRL 88, (2002) Avoidance strategy: destabilize sawteeth  keep seed island small

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Fishbones are less of a concern

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Discrete jump in  N at long T st …

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov …but  N vs. T st not really so simple

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov ICRH control of sawtooth period at center: max fast-ion stabilization at q=1: max ICCD destabilization M.-L. Mayoral et al., PoP 11, 2607 (2004) Both effects increase with ICRH power

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov ICCD destabilization of fast-particle-stabilized sawteeth ITER simulation:  -particles  ICRH-accelerated fast ions ICCD at q=1 to keep sawteeth short: tested only without strong fast particle pressure (crash criterion different)  need 2 ICRH frequencies (H minority) It works! Must still apply to NTM scenario (NBI) L.-G. Eriksson et al., PRL 92, (2004)

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Control experiments: fast ions vs. ICCD

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Control experiments: B-field scan

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Sawtooth destabilization by counter-NBI Sawteeth shorter with counter- than co-NBI

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Rotation scan in counter-NBI Sawtooth period is minimum at P~4 MW

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Minimum T st found at finite rotation Explanation? NBCD unlikely Fast ions unlikely Promising candidate: internal kink stabilization by sheared rotation

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Shape also affects sawteeth

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Conclusions NTMs are expected to be excited in ITER by long sawteeth stabilized by  -particles ICCD at q=1 has been proven to be an effective means of shortening sawteeth, even with large fast-ion pressure, thus preventing NTMs Additional sawtooth destabilization tools demonstrated on JET: rotation in counter-NBI and higher elongation

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov Plans for coming campaigns Demonstrate NTM prevention scenario with combined sawtooth stabilization/destabilization scheme –Attempt feedback on ICRH frequency for scenario optimization –Use new ICRH antenna for better coupling during ELMs Further characterize NTM triggering in a wider range of plasma parameters

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov N  *N  * Modified Rutherford equation: –small island effects cause a  * dependence w pol   *   N   * criterion –usually assumes a given seed size

Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov New JET-EP ICRH antenna Better coupling esp. during ELMs