JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple

M. F.F. Nave, L. G. Eriksson, C. Giroud, T. J. Johnson, K. Kirov, M. L. Mayoral, J. M. Noterdaeme, J. Ongena, G. Saibene, R. Sartori, F. Rimini, T. Tala, P. De Vries, K. D. Zastrow

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Abstract

Understanding the origin of rotation in ion cyclotron resonance frequency (ICRF) heated plasmas is important for predictions for burning plasmas sustained by alpha particles, being characterized by a large population of fast ions and no external momentum input. The angular velocity of the plasma column has been measured in JET H-mode plasmas with pure ICRF heating both for the standard low toroidal magnetic ripple configuration, of about ~0.08% and, for increased ripple values up to 1.5% (Nave et al 2010 Phys. Rev. Lett. 105 105005). These new JET rotation data were compared with the multi-machine scaling of Rice et al (2007 Nucl. Fusion 47 1618) for the Alfvén–Mach number and with the scaling for the velocity change from L-mode into H-mode. The JET data do not fit well any of these scalings that were derived for plasmas that are co-rotating with respect to the plasma current. With the standard low ripple configuration, JET plasmas with large ICRF heating power and normalized beta, βN ≈ 1.3, have a very small co-current rotation, with Alfvén–Mach numbers significantly below those given by the rotation scaling of Rice et al (2007 Nucl. Fusion 47 1618). In some cases the plasmas are actually counter-rotating. No significant difference between the H-mode and L-mode rotation is observed. Typically the H-mode velocities near the edge are lower than those in L-modes. With ripple values larger than the standard JET value, between 1% and 1.5%, H-mode plasmas were obtained where both the edge and the core counter-rotated.

Original languageEnglish
Article number074006
JournalPlasma Physics and Controlled Fusion
Volume54
Issue number7
DOIs
Publication statusPublished - 1 Jul 2012
MoE publication typeNot Eligible

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ripples
Plasmas
Cyclotron resonance
cyclotron resonance
scaling
ions
counters
fusion
Ions
Fusion reactions
heating
Heating
plasma currents
Alpha particles
plasma frequencies
angular velocity
configurations
Angular velocity
alpha particles
Heavy ions

Cite this

Nave, M. F. F., Eriksson, L. G., Giroud, C., Johnson, T. J., Kirov, K., Mayoral, M. L., ... Zastrow, K. D. (2012). JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple. Plasma Physics and Controlled Fusion, 54(7), [074006]. https://doi.org/10.1088/0741-3335/54/7/074006
Nave, M. F.F. ; Eriksson, L. G. ; Giroud, C. ; Johnson, T. J. ; Kirov, K. ; Mayoral, M. L. ; Noterdaeme, J. M. ; Ongena, J. ; Saibene, G. ; Sartori, R. ; Rimini, F. ; Tala, T. ; De Vries, P. ; Zastrow, K. D. / JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple. In: Plasma Physics and Controlled Fusion. 2012 ; Vol. 54, No. 7.
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title = "JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple",
abstract = "Understanding the origin of rotation in ion cyclotron resonance frequency (ICRF) heated plasmas is important for predictions for burning plasmas sustained by alpha particles, being characterized by a large population of fast ions and no external momentum input. The angular velocity of the plasma column has been measured in JET H-mode plasmas with pure ICRF heating both for the standard low toroidal magnetic ripple configuration, of about ~0.08{\%} and, for increased ripple values up to 1.5{\%} (Nave et al 2010 Phys. Rev. Lett. 105 105005). These new JET rotation data were compared with the multi-machine scaling of Rice et al (2007 Nucl. Fusion 47 1618) for the Alfv{\'e}n–Mach number and with the scaling for the velocity change from L-mode into H-mode. The JET data do not fit well any of these scalings that were derived for plasmas that are co-rotating with respect to the plasma current. With the standard low ripple configuration, JET plasmas with large ICRF heating power and normalized beta, βN ≈ 1.3, have a very small co-current rotation, with Alfv{\'e}n–Mach numbers significantly below those given by the rotation scaling of Rice et al (2007 Nucl. Fusion 47 1618). In some cases the plasmas are actually counter-rotating. No significant difference between the H-mode and L-mode rotation is observed. Typically the H-mode velocities near the edge are lower than those in L-modes. With ripple values larger than the standard JET value, between 1{\%} and 1.5{\%}, H-mode plasmas were obtained where both the edge and the core counter-rotated.",
author = "Nave, {M. F.F.} and Eriksson, {L. G.} and C. Giroud and Johnson, {T. J.} and K. Kirov and Mayoral, {M. L.} and Noterdaeme, {J. M.} and J. Ongena and G. Saibene and R. Sartori and F. Rimini and T. Tala and {De Vries}, P. and Zastrow, {K. D.}",
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Nave, MFF, Eriksson, LG, Giroud, C, Johnson, TJ, Kirov, K, Mayoral, ML, Noterdaeme, JM, Ongena, J, Saibene, G, Sartori, R, Rimini, F, Tala, T, De Vries, P & Zastrow, KD 2012, 'JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple', Plasma Physics and Controlled Fusion, vol. 54, no. 7, 074006. https://doi.org/10.1088/0741-3335/54/7/074006

JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple. / Nave, M. F.F.; Eriksson, L. G.; Giroud, C.; Johnson, T. J.; Kirov, K.; Mayoral, M. L.; Noterdaeme, J. M.; Ongena, J.; Saibene, G.; Sartori, R.; Rimini, F.; Tala, T.; De Vries, P.; Zastrow, K. D.

In: Plasma Physics and Controlled Fusion, Vol. 54, No. 7, 074006, 01.07.2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - JET intrinsic rotation studies in plasmas with a high normalized beta and varying toroidal field ripple

AU - Nave, M. F.F.

AU - Eriksson, L. G.

AU - Giroud, C.

AU - Johnson, T. J.

AU - Kirov, K.

AU - Mayoral, M. L.

AU - Noterdaeme, J. M.

AU - Ongena, J.

AU - Saibene, G.

AU - Sartori, R.

AU - Rimini, F.

AU - Tala, T.

AU - De Vries, P.

AU - Zastrow, K. D.

PY - 2012/7/1

Y1 - 2012/7/1

N2 - Understanding the origin of rotation in ion cyclotron resonance frequency (ICRF) heated plasmas is important for predictions for burning plasmas sustained by alpha particles, being characterized by a large population of fast ions and no external momentum input. The angular velocity of the plasma column has been measured in JET H-mode plasmas with pure ICRF heating both for the standard low toroidal magnetic ripple configuration, of about ~0.08% and, for increased ripple values up to 1.5% (Nave et al 2010 Phys. Rev. Lett. 105 105005). These new JET rotation data were compared with the multi-machine scaling of Rice et al (2007 Nucl. Fusion 47 1618) for the Alfvén–Mach number and with the scaling for the velocity change from L-mode into H-mode. The JET data do not fit well any of these scalings that were derived for plasmas that are co-rotating with respect to the plasma current. With the standard low ripple configuration, JET plasmas with large ICRF heating power and normalized beta, βN ≈ 1.3, have a very small co-current rotation, with Alfvén–Mach numbers significantly below those given by the rotation scaling of Rice et al (2007 Nucl. Fusion 47 1618). In some cases the plasmas are actually counter-rotating. No significant difference between the H-mode and L-mode rotation is observed. Typically the H-mode velocities near the edge are lower than those in L-modes. With ripple values larger than the standard JET value, between 1% and 1.5%, H-mode plasmas were obtained where both the edge and the core counter-rotated.

AB - Understanding the origin of rotation in ion cyclotron resonance frequency (ICRF) heated plasmas is important for predictions for burning plasmas sustained by alpha particles, being characterized by a large population of fast ions and no external momentum input. The angular velocity of the plasma column has been measured in JET H-mode plasmas with pure ICRF heating both for the standard low toroidal magnetic ripple configuration, of about ~0.08% and, for increased ripple values up to 1.5% (Nave et al 2010 Phys. Rev. Lett. 105 105005). These new JET rotation data were compared with the multi-machine scaling of Rice et al (2007 Nucl. Fusion 47 1618) for the Alfvén–Mach number and with the scaling for the velocity change from L-mode into H-mode. The JET data do not fit well any of these scalings that were derived for plasmas that are co-rotating with respect to the plasma current. With the standard low ripple configuration, JET plasmas with large ICRF heating power and normalized beta, βN ≈ 1.3, have a very small co-current rotation, with Alfvén–Mach numbers significantly below those given by the rotation scaling of Rice et al (2007 Nucl. Fusion 47 1618). In some cases the plasmas are actually counter-rotating. No significant difference between the H-mode and L-mode rotation is observed. Typically the H-mode velocities near the edge are lower than those in L-modes. With ripple values larger than the standard JET value, between 1% and 1.5%, H-mode plasmas were obtained where both the edge and the core counter-rotated.

U2 - 10.1088/0741-3335/54/7/074006

DO - 10.1088/0741-3335/54/7/074006

M3 - Article

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VL - 54

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 7

M1 - 074006

ER -