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. Naulin & 11 others 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 collaborators

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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 Rνpinchφ in H-mode plasmas is between 3-5 at r/a=0.4-0.8. Only in plasmas with R/Ln > 3, larger Rνpinchφ > 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.
Original languageEnglish
Title of host publicationProceedings of the 23rd IAEA Fusion Energy Conference
PublisherInternational Atomic Energy Agency IAEA
Publication statusPublished - 2010
MoE publication typeNot Eligible
Event23rd IAEA Fusion Energy Conference, FEC 2010 - Daejon, Korea, Republic of
Duration: 10 Oct 201016 Oct 2010

Conference

Conference23rd IAEA Fusion Energy Conference, FEC 2010
CountryKorea, Republic of
CityDaejon
Period10/10/1016/10/10

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profiles
momentum
counter rotation
sinks
energy dissipation
braking
Prandtl number
ripples
charge exchange
torque
counters
perturbation
radii
causes
magnetic fields
ions
energy

Cite this

Tala, T., Lin, Y., Mantica, P., Salmi, A., Nave, M. F. F., Sun, Y., ... JET-EFDA collaborators (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.
Tala, Tuomas ; Lin, Y. ; Mantica, P. ; Salmi, Antti ; 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. ; Naulin, V. ; Peeters, A.G. ; Rice, J.E. ; Solomon, W. ; Strintzi, D. ; Tardini, G. ; Tsalas, M. ; Van Eester, D. ; Weiland, J. ; Weisen, H. ; Zastrow, K.D. ; JET-EFDA collaborators. / JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile. Proceedings of the 23rd IAEA Fusion Energy Conference. International Atomic Energy Agency IAEA, 2010.
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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 collaborators}",
year = "2010",
language = "English",
booktitle = "Proceedings of the 23rd IAEA Fusion Energy Conference",
publisher = "International Atomic Energy Agency IAEA",
address = "Austria",

}

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 collaborators 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.

JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile. / Tala, Tuomas (Corresponding author); Lin, Y.; Mantica, P.; Salmi, Antti; 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.; Naulin, V.; Peeters, A.G.; Rice, J.E.; Solomon, W.; Strintzi, D.; Tardini, G.; Tsalas, M.; Van Eester, D.; Weiland, J.; Weisen, H.; Zastrow, K.D.; JET-EFDA collaborators.

Proceedings of the 23rd IAEA Fusion Energy Conference. International Atomic Energy Agency IAEA, 2010. EXC/3-1.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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 collaborators

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

ER -

Tala T, Lin Y, Mantica P, Salmi A, Nave MFF, Sun Y et al. JET Rotation Experiments towards the Capability to Predict the Toroidal Rotation Profile. In Proceedings of the 23rd IAEA Fusion Energy Conference. International Atomic Energy Agency IAEA. 2010. EXC/3-1