JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile

Tuomas Tala; Y. Lin; P. Mantica; Antti Salmi; M.F.F. Nave; Y. Sun; T.W. Versloot; P.C. de Vries; C. Angioni; O. Asunta; G. Corrigan; C. Giroud; J. Ferreira; T. Hellsten; T. Johnson; H.R. Koslowski; E. Lerche; Y. Liang; J. Lönnroth; V. Naulin; A.G. Peeters; J.E. Rice; W. Solomon; D. Strintzi; G. Tardini; M. Tsalas; D. Van Eester; J. Weiland; H. Weisen; K.D. Zastrow; JET-EFDA contributors

JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile

Tuomas Tala (Corresponding author), Y. Lin, P. Mantica, Antti Salmi, M.F.F. Nave, Y. Sun, T.W. Versloot, P.C. de Vries, C. Angioni, O. Asunta, G. Corrigan, C. Giroud, J. Ferreira, T. Hellsten, T. Johnson, H.R. Koslowski, E. Lerche, Y. Liang, J. Lönnroth, V. NaulinA.G. Peeters, J.E. Rice, W. Solomon, D. Strintzi, G. Tardini, M. Tsalas, D. Van Eester, J. Weiland, H. Weisen, K.D. Zastrow, JET-EFDA contributors

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

Abstract

The existence of an inward momentum pinch in JET plasmas was reported in the last IAEA meeting. Since then, several parametric scans to study the size of the inward momentum pinch demonstrate very robustly that the pinch number Rν_pinch/χ_φ in H-mode plasmas is between 3-5 at r/a=0.4-0.8. Only in plasmas with R/L_n > 3, larger Rν_pinch/χ_φ > 5 are found while other parametric dependencies are weaker. The Prandtl number is not found to depend very strongly on any of the parameters scanned, the values being typically between 1.5 and 2 at mid-radius. In intrinsic rotation studies, toroidal magnetic field ripple was found to affect both the edge rotation by lowering it typically close to zero or to small counter-rotation values and also core rotation where it is counter-rotating. An experiment to study Mode Conversion Flow Drive was performed using He³ ICRH scheme. Large central counter-rotation up to ν_φ = - 30 km/s was observed at He³ concentration levels of 10-17%, the rotation being proportional to ICRH power. A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field. The inferred torque has a global profile and originates from non-resonant components. Two types of edge rotation sinks have been analysed using recent JET data. Firstly, ELMs have been found to consistently cause a larger drop in momentum in comparison with the energy loss. Secondly, a difference in the magnitude of momentum and energy losses created by multiple charge-exchange reactions between neutrals and ions is observed, and with a significantly larger reduction in momentum than in energy content. While it seems probable that rotation profiles will be peaked in ITER thanks to the robust pinch term, its absolute value is still very challenging to predict with the present knowledge of sources and sinks and also due to the uncertainties in the rotation around the plasma edge.

Original language	English
Title of host publication	Proceedings of the 23rd IAEA Fusion Energy Conference
Publisher	International Atomic Energy Agency IAEA
Publication status	Published - 2010
MoE publication type	Not Eligible
Event	23rd IAEA Fusion Energy Conference, FEC 2010 - Daejon, Korea, Republic of Duration: 10 Oct 2010 → 16 Oct 2010

Conference

Conference	23rd IAEA Fusion Energy Conference, FEC 2010
Country/Territory	Korea, Republic of
City	Daejon
Period	10/10/10 → 16/10/10

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Tala, T., Lin, Y., Mantica, P., Salmi, A., Nave, M. F. F., Sun, Y., Versloot, T. W., de Vries, P. C., Angioni, C., Asunta, O., Corrigan, G., Giroud, C., Ferreira, J., Hellsten, T., Johnson, T., Koslowski, H. R., Lerche, E., Liang, Y., Lönnroth, J., ... JET-EFDA contributors (2010). JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile. In Proceedings of the 23rd IAEA Fusion Energy Conference Article EXC/3-1 International Atomic Energy Agency IAEA. http://www-naweb.iaea.org/napc/physics/FEC/FEC2010/papers/exc_3-1.pdf

@inproceedings{13c9d1e7f8bc43b9bc8ef55a12a4cc9c,

title = "JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile",

abstract = " The existence of an inward momentum pinch in JET plasmas was reported in the last IAEA meeting. Since then, several parametric scans to study the size of the inward momentum pinch demonstrate very robustly that the pinch number Rνpinch/χφ in H-mode plasmas is between 3-5 at r/a=0.4-0.8. Only in plasmas with R/Ln > 3, larger Rνpinch/χφ > 5 are found while other parametric dependencies are weaker. The Prandtl number is not found to depend very strongly on any of the parameters scanned, the values being typically between 1.5 and 2 at mid-radius. In intrinsic rotation studies, toroidal magnetic field ripple was found to affect both the edge rotation by lowering it typically close to zero or to small counter-rotation values and also core rotation where it is counter-rotating. An experiment to study Mode Conversion Flow Drive was performed using He3 ICRH scheme. Large central counter-rotation up to νφ = - 30 km/s was observed at He3 concentration levels of 10-17%, the rotation being proportional to ICRH power. A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field. The inferred torque has a global profile and originates from non-resonant components. Two types of edge rotation sinks have been analysed using recent JET data. Firstly, ELMs have been found to consistently cause a larger drop in momentum in comparison with the energy loss. Secondly, a difference in the magnitude of momentum and energy losses created by multiple charge-exchange reactions between neutrals and ions is observed, and with a significantly larger reduction in momentum than in energy content. While it seems probable that rotation profiles will be peaked in ITER thanks to the robust pinch term, its absolute value is still very challenging to predict with the present knowledge of sources and sinks and also due to the uncertainties in the rotation around the plasma edge.",

author = "Tuomas Tala and Y. Lin and P. Mantica and Antti Salmi and M.F.F. Nave and Y. Sun and T.W. Versloot and {de Vries}, P.C. and C. Angioni and O. Asunta and G. Corrigan and C. Giroud and J. Ferreira and T. Hellsten and T. Johnson and H.R. Koslowski and E. Lerche and Y. Liang and J. L{\"o}nnroth and V. Naulin and A.G. Peeters and J.E. Rice and W. Solomon and D. Strintzi and G. Tardini and M. Tsalas and {Van Eester}, D. and J. Weiland and H. Weisen and K.D. Zastrow and {JET-EFDA contributors}",

year = "2010",

language = "English",

booktitle = "Proceedings of the 23rd IAEA Fusion Energy Conference",

publisher = "International Atomic Energy Agency IAEA",

address = "Austria",

note = "23rd IAEA Fusion Energy Conference, FEC 2010 ; Conference date: 10-10-2010 Through 16-10-2010",

}

Tala, T, Lin, Y, Mantica, P, Salmi, A, Nave, MFF, Sun, Y, Versloot, TW, de Vries, PC, Angioni, C, Asunta, O, Corrigan, G, Giroud, C, Ferreira, J, Hellsten, T, Johnson, T, Koslowski, HR, Lerche, E, Liang, Y, Lönnroth, J, Naulin, V, Peeters, AG, Rice, JE, Solomon, W, Strintzi, D, Tardini, G, Tsalas, M, Van Eester, D, Weiland, J, Weisen, H, Zastrow, KD & JET-EFDA contributors 2010, JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile. in Proceedings of the 23rd IAEA Fusion Energy Conference., EXC/3-1, International Atomic Energy Agency IAEA, 23rd IAEA Fusion Energy Conference, FEC 2010, Daejon, Korea, Republic of, 10/10/10. <http://www-naweb.iaea.org/napc/physics/FEC/FEC2010/papers/exc_3-1.pdf>

JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile. / Tala, Tuomas (Corresponding author); Lin, Y.; Mantica, P. et al.
Proceedings of the 23rd IAEA Fusion Energy Conference. International Atomic Energy Agency IAEA, 2010. EXC/3-1.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

TY - GEN

T1 - JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile

AU - Tala, Tuomas

AU - Lin, Y.

AU - Mantica, P.

AU - Salmi, Antti

AU - Nave, M.F.F.

AU - Sun, Y.

AU - Versloot, T.W.

AU - de Vries, P.C.

AU - Angioni, C.

AU - Asunta, O.

AU - Corrigan, G.

AU - Giroud, C.

AU - Ferreira, J.

AU - Hellsten, T.

AU - Johnson, T.

AU - Koslowski, H.R.

AU - Lerche, E.

AU - Liang, Y.

AU - Lönnroth, J.

AU - Naulin, V.

AU - Peeters, A.G.

AU - Rice, J.E.

AU - Solomon, W.

AU - Strintzi, D.

AU - Tardini, G.

AU - Tsalas, M.

AU - Van Eester, D.

AU - Weiland, J.

AU - Weisen, H.

AU - Zastrow, K.D.

AU - JET-EFDA contributors

PY - 2010

Y1 - 2010

N2 - The existence of an inward momentum pinch in JET plasmas was reported in the last IAEA meeting. Since then, several parametric scans to study the size of the inward momentum pinch demonstrate very robustly that the pinch number Rνpinch/χφ in H-mode plasmas is between 3-5 at r/a=0.4-0.8. Only in plasmas with R/Ln > 3, larger Rνpinch/χφ > 5 are found while other parametric dependencies are weaker. The Prandtl number is not found to depend very strongly on any of the parameters scanned, the values being typically between 1.5 and 2 at mid-radius. In intrinsic rotation studies, toroidal magnetic field ripple was found to affect both the edge rotation by lowering it typically close to zero or to small counter-rotation values and also core rotation where it is counter-rotating. An experiment to study Mode Conversion Flow Drive was performed using He3 ICRH scheme. Large central counter-rotation up to νφ = - 30 km/s was observed at He3 concentration levels of 10-17%, the rotation being proportional to ICRH power. A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field. The inferred torque has a global profile and originates from non-resonant components. Two types of edge rotation sinks have been analysed using recent JET data. Firstly, ELMs have been found to consistently cause a larger drop in momentum in comparison with the energy loss. Secondly, a difference in the magnitude of momentum and energy losses created by multiple charge-exchange reactions between neutrals and ions is observed, and with a significantly larger reduction in momentum than in energy content. While it seems probable that rotation profiles will be peaked in ITER thanks to the robust pinch term, its absolute value is still very challenging to predict with the present knowledge of sources and sinks and also due to the uncertainties in the rotation around the plasma edge.

AB - The existence of an inward momentum pinch in JET plasmas was reported in the last IAEA meeting. Since then, several parametric scans to study the size of the inward momentum pinch demonstrate very robustly that the pinch number Rνpinch/χφ in H-mode plasmas is between 3-5 at r/a=0.4-0.8. Only in plasmas with R/Ln > 3, larger Rνpinch/χφ > 5 are found while other parametric dependencies are weaker. The Prandtl number is not found to depend very strongly on any of the parameters scanned, the values being typically between 1.5 and 2 at mid-radius. In intrinsic rotation studies, toroidal magnetic field ripple was found to affect both the edge rotation by lowering it typically close to zero or to small counter-rotation values and also core rotation where it is counter-rotating. An experiment to study Mode Conversion Flow Drive was performed using He3 ICRH scheme. Large central counter-rotation up to νφ = - 30 km/s was observed at He3 concentration levels of 10-17%, the rotation being proportional to ICRH power. A strong toroidal rotation braking has been observed in plasmas with application of an n = 1 magnetic perturbation field. The inferred torque has a global profile and originates from non-resonant components. Two types of edge rotation sinks have been analysed using recent JET data. Firstly, ELMs have been found to consistently cause a larger drop in momentum in comparison with the energy loss. Secondly, a difference in the magnitude of momentum and energy losses created by multiple charge-exchange reactions between neutrals and ions is observed, and with a significantly larger reduction in momentum than in energy content. While it seems probable that rotation profiles will be peaked in ITER thanks to the robust pinch term, its absolute value is still very challenging to predict with the present knowledge of sources and sinks and also due to the uncertainties in the rotation around the plasma edge.

M3 - Conference article in proceedings

BT - Proceedings of the 23rd IAEA Fusion Energy Conference

PB - International Atomic Energy Agency IAEA

T2 - 23rd IAEA Fusion Energy Conference, FEC 2010

Y2 - 10 October 2010 through 16 October 2010

ER -

JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile

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