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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 on theme: "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."— Presentation transcript:

1 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 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

2 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Outline NTM triggering by long sawteeth Sawtooth destabilization by ICCD Sawtooth destabilization by counter-NBI

3 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Long sawteeth trigger (3,2) NTMs at low  N O. Sauter et al., PRL 88, 105001 (2002) Avoidance strategy: destabilize sawteeth  keep seed island small

4 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Fishbones are less of a concern

5 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Discrete jump in  N at long T st …

6 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 …but  N vs. T st not really so simple

7 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 ICRH control of sawtooth period +90 0 at center: max fast-ion stabilization -90 0 at q=1: max ICCD destabilization M.-L. Mayoral et al., PoP 11, 2607 (2004) Both effects increase with ICRH power

8 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 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, 235004 (2004)

9 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Control experiments: fast ions vs. ICCD

10 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Control experiments: B-field scan

11 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Sawtooth destabilization by counter-NBI Sawteeth shorter with counter- than co-NBI

12 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Rotation scan in counter-NBI Sawtooth period is minimum at P~4 MW

13 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Minimum T st found at finite rotation Explanation? NBCD unlikely Fast ions unlikely Promising candidate: internal kink stabilization by sheared rotation

14 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 Shape also affects sawteeth

15 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 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

16 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 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

17 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 N  *N  * Modified Rutherford equation: –small island effects cause a  * dependence w pol   *   N   * criterion –usually assumes a given seed size

18 Sawtooth control in JET S. Coda, MHD workshop, PPPL, 22 Nov. 2004 New JET-EP ICRH antenna Better coupling esp. during ELMs

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