Plasma rotation and momentum transport studies at JET

P.C. de Vries, Karin M. Rantamäki, E. Asp, G. Corrigan, A. Eriksson, C. Giroud, H.C.M. Knoops, P. Mantica, H. Nordman, P. Strand, Tuomas Tala, J. Weiland, K.-D. Zastrow, JET-EFDA Contributors

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

An experimental study in plasma rotation and momentum transport was carried out at JET. The toroidal rotation profile was found to scale approximately with that of the ion temperature. However, significant deviations from this were found in high density ELMy H-mode discharges, which had broader rotation profiles. A rotation database analysis showed the variation of the dimensionless Mach number with respect to the plasma scenario. For predominantly NBI heated discharges the Mach number was found to be in the range of 0.3–0.45. Larger Mach numbers were observed in type I ELMy H-modes, while scenarios exhibiting type III ELMs or L-mode had lower Mach numbers. Advanced scenarios often showed a significant increase in the central Mach number when an internal transport barrier formed. A detailed study was done to investigate the Prandtl number, Pr, defined as the ratio between momentum and ion heat diffusivity. Generally the Prandtl number was found to be significantly below unity, e.g. 0.18 < Pr < 0.35. Although it is often predicted that momentum and heat diffusivity are equal in ITG dominated plasma, also for high density ELMy H-mode discharges with temperature profiles close and above the ITG threshold, the Prandtl number was Pr ~ 0.3.
Original languageEnglish
Pages (from-to)1693-1708
Number of pages16
JournalPlasma Physics and Controlled Fusion
Volume48
Issue number12
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

Mach number
Momentum
momentum
Prandtl number
Plasmas
diffusivity
heat
Ions
ion temperature
profiles
Discharge (fluid mechanics)
temperature profiles
unity
deviation
Temperature
thresholds
ions
Hot Temperature

Keywords

  • JET
  • plasma
  • plasma simulation
  • fusion energy
  • fusion reactors
  • tokamak
  • ITER
  • internal transport barriers

Cite this

de Vries, P. C., Rantamäki, K. M., Asp, E., Corrigan, G., Eriksson, A., Giroud, C., ... JET-EFDA Contributors (2006). Plasma rotation and momentum transport studies at JET. Plasma Physics and Controlled Fusion, 48(12), 1693-1708. https://doi.org/10.1088/0741-3335/48/12/001
de Vries, P.C. ; Rantamäki, Karin M. ; Asp, E. ; Corrigan, G. ; Eriksson, A. ; Giroud, C. ; Knoops, H.C.M. ; Mantica, P. ; Nordman, H. ; Strand, P. ; Tala, Tuomas ; Weiland, J. ; Zastrow, K.-D. ; JET-EFDA Contributors. / Plasma rotation and momentum transport studies at JET. In: Plasma Physics and Controlled Fusion. 2006 ; Vol. 48, No. 12. pp. 1693-1708.
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abstract = "An experimental study in plasma rotation and momentum transport was carried out at JET. The toroidal rotation profile was found to scale approximately with that of the ion temperature. However, significant deviations from this were found in high density ELMy H-mode discharges, which had broader rotation profiles. A rotation database analysis showed the variation of the dimensionless Mach number with respect to the plasma scenario. For predominantly NBI heated discharges the Mach number was found to be in the range of 0.3–0.45. Larger Mach numbers were observed in type I ELMy H-modes, while scenarios exhibiting type III ELMs or L-mode had lower Mach numbers. Advanced scenarios often showed a significant increase in the central Mach number when an internal transport barrier formed. A detailed study was done to investigate the Prandtl number, Pr, defined as the ratio between momentum and ion heat diffusivity. Generally the Prandtl number was found to be significantly below unity, e.g. 0.18 < Pr < 0.35. Although it is often predicted that momentum and heat diffusivity are equal in ITG dominated plasma, also for high density ELMy H-mode discharges with temperature profiles close and above the ITG threshold, the Prandtl number was Pr ~ 0.3.",
keywords = "JET, plasma, plasma simulation, fusion energy, fusion reactors, tokamak, ITER, internal transport barriers",
author = "{de Vries}, P.C. and Rantam{\"a}ki, {Karin M.} and E. Asp and G. Corrigan and A. Eriksson and C. Giroud and H.C.M. Knoops and P. Mantica and H. Nordman and P. Strand and Tuomas Tala and J. Weiland and K.-D. Zastrow and {JET-EFDA Contributors}",
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de Vries, PC, Rantamäki, KM, Asp, E, Corrigan, G, Eriksson, A, Giroud, C, Knoops, HCM, Mantica, P, Nordman, H, Strand, P, Tala, T, Weiland, J, Zastrow, K-D & JET-EFDA Contributors 2006, 'Plasma rotation and momentum transport studies at JET', Plasma Physics and Controlled Fusion, vol. 48, no. 12, pp. 1693-1708. https://doi.org/10.1088/0741-3335/48/12/001

Plasma rotation and momentum transport studies at JET. / de Vries, P.C.; Rantamäki, Karin M.; Asp, E.; Corrigan, G.; Eriksson, A.; Giroud, C.; Knoops, H.C.M.; Mantica, P.; Nordman, H.; Strand, P.; Tala, Tuomas; Weiland, J.; Zastrow, K.-D.; JET-EFDA Contributors.

In: Plasma Physics and Controlled Fusion, Vol. 48, No. 12, 2006, p. 1693-1708.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Plasma rotation and momentum transport studies at JET

AU - de Vries, P.C.

AU - Rantamäki, Karin M.

AU - Asp, E.

AU - Corrigan, G.

AU - Eriksson, A.

AU - Giroud, C.

AU - Knoops, H.C.M.

AU - Mantica, P.

AU - Nordman, H.

AU - Strand, P.

AU - Tala, Tuomas

AU - Weiland, J.

AU - Zastrow, K.-D.

AU - JET-EFDA Contributors,

PY - 2006

Y1 - 2006

N2 - An experimental study in plasma rotation and momentum transport was carried out at JET. The toroidal rotation profile was found to scale approximately with that of the ion temperature. However, significant deviations from this were found in high density ELMy H-mode discharges, which had broader rotation profiles. A rotation database analysis showed the variation of the dimensionless Mach number with respect to the plasma scenario. For predominantly NBI heated discharges the Mach number was found to be in the range of 0.3–0.45. Larger Mach numbers were observed in type I ELMy H-modes, while scenarios exhibiting type III ELMs or L-mode had lower Mach numbers. Advanced scenarios often showed a significant increase in the central Mach number when an internal transport barrier formed. A detailed study was done to investigate the Prandtl number, Pr, defined as the ratio between momentum and ion heat diffusivity. Generally the Prandtl number was found to be significantly below unity, e.g. 0.18 < Pr < 0.35. Although it is often predicted that momentum and heat diffusivity are equal in ITG dominated plasma, also for high density ELMy H-mode discharges with temperature profiles close and above the ITG threshold, the Prandtl number was Pr ~ 0.3.

AB - An experimental study in plasma rotation and momentum transport was carried out at JET. The toroidal rotation profile was found to scale approximately with that of the ion temperature. However, significant deviations from this were found in high density ELMy H-mode discharges, which had broader rotation profiles. A rotation database analysis showed the variation of the dimensionless Mach number with respect to the plasma scenario. For predominantly NBI heated discharges the Mach number was found to be in the range of 0.3–0.45. Larger Mach numbers were observed in type I ELMy H-modes, while scenarios exhibiting type III ELMs or L-mode had lower Mach numbers. Advanced scenarios often showed a significant increase in the central Mach number when an internal transport barrier formed. A detailed study was done to investigate the Prandtl number, Pr, defined as the ratio between momentum and ion heat diffusivity. Generally the Prandtl number was found to be significantly below unity, e.g. 0.18 < Pr < 0.35. Although it is often predicted that momentum and heat diffusivity are equal in ITG dominated plasma, also for high density ELMy H-mode discharges with temperature profiles close and above the ITG threshold, the Prandtl number was Pr ~ 0.3.

KW - JET

KW - plasma

KW - plasma simulation

KW - fusion energy

KW - fusion reactors

KW - tokamak

KW - ITER

KW - internal transport barriers

U2 - 10.1088/0741-3335/48/12/001

DO - 10.1088/0741-3335/48/12/001

M3 - Article

VL - 48

SP - 1693

EP - 1708

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 12

ER -

de Vries PC, Rantamäki KM, Asp E, Corrigan G, Eriksson A, Giroud C et al. Plasma rotation and momentum transport studies at JET. Plasma Physics and Controlled Fusion. 2006;48(12):1693-1708. https://doi.org/10.1088/0741-3335/48/12/001